压实度对红层泥岩土中土工格栅拉拔性能影响的试验研究  

Influence of Degree of Compaction Content on Pullout Behavior of Geogrid in Red Bed Mudstone

作　　者：洪英广[1] 王宁[1] 卢萍[1] 姚勇[1] 

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《建筑科学》2012年第9期64-67,共4页Building Science

基　　金：国家自然科学基金项目(10602048);四川省自然科学基金项目(2009YJ0060)

摘　　要：通过室内拉拔试验,研究压实度对土工格栅与红层泥岩界面拉拔性状的影响,试验结果表明,土工格栅在红层泥岩中主要表现为拔出破坏。随着压实度的增大,在一定程度上提高筋土界面的峰值剪应力;在压实度一定的情况下,随着竖向应力的增加,筋土界面剪应力峰值增大,其对应的剪切位移减小。由于土与土工格栅接触面的剪胀造成该类接触面的界面剪应力峰值与竖向应力不再是线性关系。Laboratory pull-out tests are used to investigate the effect of degree of compaction content on pull-out behavior of the interface between geogrid and red bed mudstone. The results indicate that the geogrid embedded in red bed mudstone mainly represents pullout failure. With the increasing degree of compaction,the peak shearing stress has improvement to a certain extent. In the definite degree of compaction, with the increase of the vertical stress the peak shearing stress increase, but the corresponding shear displacement decreases. The shear strength of the interface is not proportional to the normal stress because of its dilatancy behavior due to shear application.

关 键 词：土工格栅 红层泥岩 压实度 界面特性 拉拔试验 

分 类 号：TU472.34[建筑科学—结构工程] TU413.1[建筑科学—土工工程]