杨建民1,2,司航1

（1 天津大学建筑工程学院土木工程系， 天津 300072；

2 滨海土木工程结构与安全教育部重点实验室（天津大学）， 天津 300072）

［摘要］抗滑桩是土质边坡滑坡防护与治理的一种重要手段，抗滑桩上滑坡推力分布是桩截面和配筋设计的重要依据。目前国内外广泛采用的抗滑桩滑坡推力分布计算是Ito基于塑性变形提出的方法。在Ito方法的基础上，改进其计算理论的基本假设条件，即考虑桩后土体滑动面上的摩擦力影响，经重新推导提出一种改进的滑坡作用在抗滑桩上水平推力分布的计算公式。与Ito原文中算例的原公式计算结果和实测结果比较，改进后的公式计算值更符合实测结果。与成昆铁路沙北Ⅰ号滑坡5号桩的实测数据比较，改进后的公式计算值较为符合。改进后的抗滑桩滑坡推力计算方法对于土质边坡抗滑桩设计具有借鉴价值和适用性。

［关键词］土质边坡； 抗滑桩； 滑坡推力； 塑性变形

中图分类号： TU413.6+2    文献标识码： A    文章编号： 1002-848X(2015)S2-0248-06

A modified calculation method for the distribution of lateral force acting on

 stabilizing piles in soil slopes

Yang Jianmin1,2, Si Hang1

(1 Department of Civil Engineering, Tianjin University, Tianjin 300072, China)

2 Key Laboratory of Coast Civil Structure Safety (Tianjin University), Ministry of Education, Tianjin 300072, China)

Abstract: Setting stabilizing piles is one of the significant measures to avoid landslides or slope failures, and the basis of the design of the piles, such as section size and reinforcement, is the distribution of landslide thrust force acting on the piles. One of the most widely used methods to estimate the force is proposed by Ito, which is based on the theory of plastic deformation. Ito′s method was optimized by means of considering the frictional force acting on the surface between the piles and soil. Then, the new formulas was deduced, and contrast with Ito′ method through the analysis of the examples quoted by Ito, in which the new method was more close to the observed values. The similar conclusion also can be obtained through the contrast in the example of 5# pile in Shabei Slope. So the optimized method to estimate the landslide thrust force in soil slope has great reference value and applicability in the design of stabilizing piles.

Keywords: soil slope; stabilizing pile; landslide thrust force; plastic deformation

作者简介：杨建民，博士，副教授，Email:yangjianmin@tju.edu.cn。