悬臂式抗滑桩模型试验研究

作为治理滑坡的重要手段之一的抗滑桩，由于岩土体介质的特殊性，桩后滑坡推力、土体抗力及桩身变形破坏模式与理论计算存在较大差异。通过悬臂式抗滑桩加固滑坡的模型试验，对滑体进行逐级加载，测得桩后滑坡推力、桩前土体抗力和桩体的应变，研究滑坡推力分布、土体抗力的变化情况、桩身变形破坏模式。试验结果表明，对于悬臂式抗滑桩可分为分离段和接触段两部分，滑坡推力逐渐向接触段集中；桩前土体抗力主要在桩前25 cm以上，随着深度增加，抗力逐渐减小；悬臂式抗滑桩为折断破坏形式，破坏点的位置在滑面以下25 cm处。模型破坏主要是由于桩前土体发生屈服，从而使桩顶部位移过大，致使桩身因折断破坏而失效，最终滑坡模型失稳。其结果可为实际工程提供借鉴。

Study of model test on cantilever anti-slide pile

The anti-slide pile is an important method to treat landslide at present.Because of the particularity of rock and soil masses,there are many differences between the practical engineering,landslide thrust of landslide at the back of the pile,soil resistance,failure mode of pile deformation,and theoretical calculation.So we’ve done the physical model test of fortifying landslide with cantilever anti-slide pile,loaded step by step on the top of landslide mass,then obtained some phenomena and lots of test data,the landslide thrust at the back of the pile,soil resistance in the front of the pile and pile strain by using testing equipments.According to the test data,pile failure mode and variation of landslide thrust distribution and soil resistance are analyzed.The test results show that the cantilever anti-slide pile is divided into two parts: separated part and contact part;then landslide thrust has gradually concentrated to the contact part as load increases.Soil resistance in the front of the pile is mainly above 25 cm.It decreases with the depth increasing.The failure model of cantilever anti-slide pile is break-off and the failure point of pile lies 25 cm below the sliding surface.The reason is soil yielding in front of pile caused a large displacement of the pile top and the pile broke off.Finally landslide is instable.These results have reference significant for the actual engineering.