土钉加固黏性土坡加载的离心模型试验研究  

Centrifugal model test on behavior of strip footing on soil nail-reinforced cohesive soil slopes

作　　者：曹洁[1] 张嘎[1] 王丽萍[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《岩土力学》2012年第6期1696-1702,共7页Rock and Soil Mechanics

基　　金："973"课题(No.2007CB714108);国家自然科学基金(No.50979045)

摘　　要：进行了不同坡度土钉加固边坡坡顶加载的离心模型试验,观测了土坡的破坏过程并测量土坡的位移场,研究了土钉加固黏性土坡的承载力、变形和破坏规律以及坡角对其破坏规律的影响。试验结果表明,坡顶荷载的增加引起土坡变形的增加,变形的集中产生和发展导致滑裂面的形成并使土坡发生破坏。土钉变形规律受加载阶段和加载底板的综合影响,坡顶荷载越大,接近坡顶的土钉弯曲挠度越大,钉土间的相互作用越强。土坡的坡角越大,承载力越低,土体呈现出更显著的向坡面位移的趋势。Centrifugal model tests are conducted to study the bearing capacity,deformation rules and effect of slope inclination on failure rules of soil nail-reinforced cohesive soil slopes when they subjected to a vertical load applied to a strip footing.The failure processes are observed photographically and the displacements of slopes are measured.The results show that the slope stability is significantly affected by the surface load.When vertical load increased,soil deformation concentrated;slip surfaces can be noted and propagated which will eventually lead to collapse of the slope.Under the influence of loading process and strip footing,soil nails closer to the slope surface exhibits an intensive interaction with the soil resulting from the increasing load.As the slope inclination increases,the bearing capacity decreases and the soil exhibits much more obvious movement tendency toward slope surface.

关 键 词：坡顶加载 加固土坡 土钉 离心模型试验 破坏规律 土钉变形 

分 类 号：TU411.3[建筑科学—岩土工程]