摘要
目前抗滑桩桩间距的研究主要是针对二维单层均质滑坡体模型,而实际工程中有大量滑坡体具有多层结构特征。鉴于此,构建一种三维多层滑坡体模型,分析桩后土拱的形成过程和土拱演化的4个阶段,并提出适用于多层滑坡体的条分法。通过改进后的条分法计算确定最危险滑体,引入滑坡推力分布函数及土体抗力分布函数,准确刻画了多层桩后土拱的应力分布特征。根据最危险滑体中土拱的平衡条件、统一强度理论的强度条件和桩后土体发挥作用条件,提出2种适用于三维多层滑坡体模型的最小桩间计算方法和2种相应的抗滑桩群布设方案。通过对厚坝滑坡与八字门滑坡的计算结果表明,2种抗滑桩群布设方案比传统等距设置抗滑桩的方案节省桩数比率均大于12%。提出的三维多层滑坡体模型与计算方法对工程实践中多层滑坡体桩间距的确定和抗滑桩群的布设具有一定的借鉴意义。
The current researches on the pile spacing of stabilizing piles mainly focus on the two-dimensional landslide model with a single homogeneous layer.However,substantial evidence indicates that a large number of landslides in the actual engineering practice have the characteristics of multi-layer structure.A three-dimensional multi-layer landslide model was developed to analyze the formation of the soil arching behind the piles and the four-stage process of soil arching.Furthermore,an improved strip method was presented based upon the presented three-dimensional multi-layer landslide model.The most dangerous sliding body can be obtained via the improved strip method accordingly.The distribution function of the driving force and the distribution function of soil resistance in landslide mass were introduced to accurately describe the stress distribution in the soil arching.In view of the balance condition of arching in the most dangerous sliding body,the strength condition of the unified strength theory and conditions for soil behind pile to play a role,two methods of calculating the minimum pile spacing and correspondingly two layout schemes for stabilizing piles were put forward.The calculation results of the Houba landslide and the Bazimen landslide show that two optimized layout schemes of stabilizing piles reduce the stabilizing pile ratio at least 12% than the conventional layout scheme of stabilizing piles.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2018年第2期473-484,共12页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(41472261)
中央高校基本科研业务费专项资金项目(腾飞计划)(CUG150621)
地质灾害防治与地质环境保护国家重点实验室开放基金(SKLGP2017K017)~~
关键词
边坡工程
滑坡
抗滑桩
最小桩间距
统一强度理论
土拱效应
slope engineering
landslide
stabilizing piles
minimum pile spacing
unified strength theory
soil arching effect
