摘要
为解决抗滑短桩加固滑坡体理论研究不满足工程应用需要的现状,本文采用基于快速拉格朗日算法的FLAC3D软件,对桩长变化的抗滑短桩加固碎石土滑坡全过程进行三维有限元模拟,通过分析滑体位移、应力、抗滑短桩位移和桩身弯矩的变化规律,研究抗滑短桩的受力变形特性及桩土相互作用机理。研究表明:经抗滑短桩加固后的滑坡,稳定性显著提高;随着桩长增加,桩后应力分布越均匀,抗滑短桩与桩周土体的整体性越好,滑体最大位移逐渐减小,有效抑制滑体位移;当桩长小于60 cm时,滑体出现"越顶"现象,在楔形体前缘顶部形成了贯通滑动面,且发生较小范围的失稳破坏;当桩体自由段与滑体厚度比值为0.52~0.59时,加固效果最理想。研究结果对抗滑短桩加固滑坡体的抗滑机理予以补充。
In order to solve the theoretical research on the reinforcement of landslide by short anti-sliding piles which does not match the needs of engineering application. Use FLAC3D based on fast Lagrange algorithm to simulate the whole process of the reinforced gravel soil landslide with short anti-sliding piles with varying length. By analyzing the laws of displacement and stress of the sliding body,displacement and the bending moment of short anti-sliding piles,the mechanical deformation characteristics and pile-soil interaction mechanism of anti-sliding short piles are studied. The results show that reinforced by the short anti-sliding pile,the stability of the slope is increased obviously. The maximum displacement of slope is decreasing with the increasing length of short pile,but the range of decreasing is reducing. With the increase of pile length,the more uniform the stress distribution after pile,the better the integrity of short anti-sliding pile and soil around pile is,and the maximum displacement of sliding body decreases gradually,effectively inhibiting the displacement of sliding body. When the pile length isless than 60 cm,＂over the top＂phenomenon occurs in the sliding body,and a penetrating sliding surface is formed at the top of the wedge＇s leading edge,and a small range of instability failure occurs. When the length of free segment of pile is 0. 52 ~ 0. 59 times of the sliding body thickness,the reinforcement effect is the best. The results of the study complement the anti-sliding mechanism of short anti-skid pile.
作者
胡时友
蔡强
李乾坤
张勇
石胜伟
HU Shiyou;CAI Qiang;LI Qiankun;ZHANG Yong;SHI Shengwei(Chengdu University of Technology,Chengdu 610059;Institute of Exploration Technology,CAGS,Chengdu 611734;Technical Center for Geological Hazard Prevention and Control,CGS,Chengdu 611734)
出处
《工程地质学报》
CSCD
北大核心
2018年第4期969-977,共9页
Journal of Engineering Geology
基金
中国地质调查局项目(1212011220170)资助
关键词
碎石土滑坡
抗滑短桩
受力变形特性
桩土相互作用
越顶
Gravel soil landslide
Short anti-sliding pile
Mechanical deformation characteristics
Pile-soilinteraction
Cross over the pile
