摘要
大型滑坡受工程地质条件影响,通常具有多滑带结构特征.而抗滑桩加固研究中较少考虑土拱效应对多滑带滑坡的影响.因此,开展了推力荷载作用下多层滑带滑坡-抗滑桩体系的数值模拟,探讨了不同桩间距和桩嵌固深度对多层滑带抗滑桩土拱效应的影响,并评估了不同抗滑桩设计参数下桩的加固效果.研究结果表明:(1)在多层滑带滑坡运动过程中,桩周应力沿深度方向呈现双向多级土拱分布,表现为“桩后土拱-桩前土拱-桩后土拱”现象;(2)桩间距由6倍减小至2倍时,抗滑桩在不同深度的端承土拱效应越明显,加固效果越好.桩间距由2倍增大至6倍时,桩间摩擦土拱逐渐成为主要的抗滑作用,抗滑桩加固效果变差;(3)嵌固深度的变化不会改变抗滑桩不同深度处的土拱类型,但会影响土拱的强度;(4)当浅层滑动主导时,减小桩间距可以提高抗滑桩的加固效果;而当深层滑动主导时,应增加嵌固深度以提高加固效果.
Large landslides are typically characterized by the multi-sliding zones structure,influenced by engineering geological conditions.However,the impact of the soil arch effect on multi-sliding zones landslide is often overlooked in studies of anti-slide piles reinforcement.Therefore,numerical simulations of multi-sliding zones landslide-anti-sliding piles system under thrust loading were conducted.These simulations investigated the effects of pile spacing and embedment depth on the soil arching effect across different motion modes and evaluated the reinforcement effectiveness under various design parameters.The results show that:(1)During landslide movement in multi-sliding zones,the stress around the pile exhibits a bidirectional,multi-level soil arch distribution along the depth,manifesting as the phenomenon of“soil arch behind pile-soil arch in front of the pile-soil arch behind pile”.(2)As the pile spacing decreases from six times to two times the pile diameter,the end-bearing soil arch effect at various depths becomes more pronounced,thereby improving the reinforcement effect.Conversely,when the pile spacing increases from two times to six times,the frictional soil arch between the piles gradually becomes the dominant anti-slide mechanism,diminishing the reinforcement effectiveness.(3)Changes in embedding depth do not alter the type of soil arch at different depths but affect the strength of the soil arch.(4)When shallow sliding dominates,reducing pile spacing enhances the reinforcement effect of anti-slide piles;when deep sliding dominates,increasing the embedment depth improves the reinforcement effect.
作者
李亚博
胡新丽
徐楚
张海燕
刘欣宇
Li Yabo;Hu Xinli;Xu Chu;Zhang Haiyan;Liu Xinyu(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)
出处
《地球科学》
北大核心
2025年第8期3153-3166,共14页
Earth Science
基金
重点国际(地区)合作与交流项目(No.42020104006)。
关键词
多层滑带滑坡
抗滑桩设计参数
土拱效应
数值模拟
加固效果
工程地质
multi-sliding zones landslide
anti-slide pile design parameters
soil arching effect
numerical simulation
reinforcement effect
engineering geology
