框架式抗滑桩受力特性对比分析

Force Analysis of Framed Anti-slide Piles

为探究大型滑坡治理中框架式抗滑桩的受力机理,采用ANSYS有限元计算及模型试验方法,对比分析了框架式双排抗滑桩的内力和变形特征。建立了能反映框架式双排抗滑桩空间效应的有限元模型,并运用相似理论构造了室内试验模型,对比分析了数值模拟和室内模型试验结果。结果表明:模型试验与数值模拟结果总体趋于一致;前、后排桩身弯矩存在反弯点,其最大值出现在滑动面处,后排桩起到主要的抗滑作用;纵向框架梁的最大弯矩值在桩、梁交接处,横向框架梁对抗滑桩起到了很好的变形协调作用,在以边桩为拱脚处表现出明显的土拱效应;对比分析验证了框架式抗滑桩具有土拱-桩-梁空间协同受力特性及变形规律。

In order to analyze the force performance of framed anti-slide piles, a finite element computing model for framed anti-slide piles was established and a test study was also carried out. Numerical computing result was compared with test result. The result shows that numerical computing result tends to be consistent with the test result~ in front and rear bending moment there are inflection points, the maximum value of which is on the sliding surface~ rear piles play an important role in stabilizing landside~ the greatest moment of vertical beam is at the junction between pile and beam; tranverse beams can ensure the deformation compatibility between piles; and soil arehing effect can be observed in side piles, which are also called areh feet. The comparison proves that soil arching, piles and beams interact with each other and have a collaborative effect on framed anti-slide piles.