Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 29

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 32

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JRequest::clean() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 33

Strict Standards: Non-static method JRequest::_cleanArray() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/environment/request.php on line 463

Strict Standards: Non-static method JRequest::_cleanArray() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/environment/request.php on line 464

Strict Standards: Non-static method JRequest::_cleanArray() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/environment/request.php on line 465

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Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 35

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 38

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 39

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 46

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 47

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 50

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 53

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 54

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 57

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 58

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JFactory::getApplication() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/index.php on line 31

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Redefining already defined constructor for class JObject in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/base/object.php on line 57

Strict Standards: Non-static method JApplication::getInstance() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 46

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JApplicationHelper::getClientInfo() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/application/application.php on line 130

Strict Standards: Declaration of JSite::getRouter() should be compatible with & JApplication::getRouter($name = NULL, $options = Array) in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/includes/application.php on line 377

Strict Standards: Declaration of JSite::getPathWay() should be compatible with & JApplication::getPathway($name = NULL, $options = Array) in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/includes/application.php on line 377

Strict Standards: Declaration of JSite::getMenu() should be compatible with & JApplication::getMenu($name = NULL, $options = Array) in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/includes/application.php on line 377

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JFactory::getConfig() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/application/application.php on line 730

Strict Standards: Non-static method JFactory::_createConfig() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 73

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/registry/registry.php on line 19

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JUtility::getHash() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/application/application.php on line 99

Strict Standards: Non-static method JFactory::getConfig() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/utilities/utility.php on line 111

Strict Standards: Non-static method JFactory::getConfig() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/application/application.php on line 382

Strict Standards: Non-static method JFactory::getSession() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/application/application.php on line 768

Strict Standards: Non-static method JFactory::_createSession() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 94

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JFactory::getConfig() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 501

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Declaration of JSession::set() should be compatible with JObject::set($property, $value = NULL) in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/session.php on line 770

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/session.php on line 19

Strict Standards: Non-static method JSession::getInstance() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 507

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JSessionStorage::getInstance() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/session.php on line 108

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JFilterInput::clean() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/storage.php on line 57

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JFactory::getDBO() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/storage/database.php on line 64

Strict Standards: Non-static method JFactory::getConfig() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 268

Strict Standards: Non-static method JFactory::_createDBO() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 271

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JFactory::getConfig() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 551

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JDatabase::getInstance() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 563

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JError::isError() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 565

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JTable::getInstance() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/storage/database.php on line 69

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JPath::find() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/database/table.php on line 91

Strict Standards: Non-static method JTable::addIncludePath() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/database/table.php on line 91

Strict Standards: Non-static method JFactory::getDBO() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/database/table.php on line 112

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php:29) in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/session.php on line 423

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php:29) in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/session.php on line 423

Warning: Cannot modify header information - headers already sent by (output started at /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php:29) in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/session.php on line 426

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Thí nghiệm xuyên tiêu chuẩn (SPT)
Thứ bảy, Tháng 10 21, 2017
   
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TIN MỚI

Thí nghiệm xuyên tiêu chuẩn (SPT)

Mục đích: thí nghiệm dùng để đánh giá:

- Sức chịu tải của đất nền

- Độ chặt tương đối của nền đất cát

- Trạng thái của đất loại sét

- Độ bền nén một trục (qu) của đất sét

- Kết hợp lấy mẫu để phân loại đất

· Tên tiếng Anh: Standard Penetration Test .

· Nguyên lý thí nghiệm:

Tiến hành đóng một ống mẫu vào đáy hố khoan bằng một quả tạ nặng 63,5kg, rơi tự do với chiều cao là 76cm, rồi tiến hành đếm số búa đập theo các khoảng chiều sâu thâm nhập quy ước.

· Dụng cụ thí nghiệm:

- Ống mẫu: đường kính ngoài 50,8mm, đường kính trong 34,9mm, chiều dài ống chẻ: 609mm, chiều dài mũi đóng là 57,1mm.

- Tạ có trọng lượng 63,5kg, rơi tự do trên đế nện.

- Đế nện.

- Cần trượt định hướng.


· Trình tự thí nghiệm:

- Bước 1: Khoan tạo lỗ đến độ sâu dự định thí nghiệm, vét sạch đáy, hạ ống mẫu SPT và lắp đặt đế nện, cần, tạ…

- Bước 2: vạch lên cần đóng 3 khoảng, mỗi khoảng 15cm (tổng chiều sâu đóng 45cm).

- Bước 3: Cho tạ rơi tự do ở độ cao 76cm, đếm và ghi số tạ đóng cho từng khoảng 15cm.

- Bước 4: lấy chỉ số tạ đóng của 30cm cuối cùng làm chỉ số SPT.

Khoảng cách thí nghiệm SPT thông thường từ 1 – 3m, tùy theo độ đồng nhất của đất nền.

 

· Trình bày kết quả:

Kết quả đếm số búa thực tế sẽ được hiệu chỉnh tùy theo loại đất và theo độ sâu.

- Hiệu chỉnh cát mịn lẫn bụi theo Terzaghi & Peck:

N' = 15 + 0,5 (N - 15)

- Hiệu chỉnh theo độ sâu:

N' = N + 35/(7 + gh)

- Hiệu chỉnh nước dưới đất:

N' = 0,5N + 7,5

Trong đó:

N : chỉ số búa đóng thực tế

N' : chỉ số búa hiệu chỉnh

h : chiều sâu thí nghiệm (m)

g : dung trọng (t/m3) trên mực nước. Dưới mực nước sử dụng g' đẩy nổi.

Kết quả SPT được trình bày như sau:

 

· Hình ảnh dụng cụ thí nghiệm:

· Tiêu chuẩn hướng dẫn thí nghiệm:

- Tiêu chuẩn Việt Nam: TCXD 226:1999

- Tiêu chuẩn ASTM: D 1586

· Tài liệu tham khảo:

- Hình ảnh: www.eng.fsu.edu,

- Cẩm nang dành cho kỹ sư địa kỹ thuật, Trần Văn Việt.

Nguồn: ThS. Trần Quang Huy - www.tracuuxaydung.com

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