摘要
抗滑桩是加固边坡的常用方法,不同的抗滑桩设计方案会影响桩加固边坡的破坏模式与稳定性。本文采用数值方法来模拟桩土相互作用,建立了抗滑桩加固边坡的计算模型。通过以坡面位移突变为判据的强度折减法计算加固边坡的安全系数,同时获得加固边坡的破坏模式。以某一土质边坡为例,分析了不同抗滑桩桩径及设桩位置组合下的加固边坡破坏模式,并从抗滑桩桩顶位移的角度来解释加固边坡破坏模式的变化规律。结果表明:抗滑桩的设桩位置对加固边坡的破坏模式起决定作用,不同的设桩位置会产生桩后土体滑移破坏、桩前土体滑移破坏和桩身断桩破坏3种破坏模式;抗滑桩的桩径决定了桩的抗弯能力,从而决定加固边坡在发生破坏时是桩失效还是边坡失稳。
The stabilizing piles are commonly used methods to reinforce slopes,of which its design scheme influences the safety and failure modes of the reinforced slope.In this paper,a numerical model that considers the pile-soil interaction was established for the reinforced slope.The factor of safety of the reinforced slope was calculated by the strength reduction method based on the criterion of excessive displacement on slope surface,with which the failure modes of the reinforced slope can be obtained simultaneously.The failure modes of the reinforced slope under the combinations of different pile diameters and installation positions were analyzed for a soil slope,and were explained from the perspective of the displacement of the top of stabilizing pile.The results show that the installation position of the pile plays a significant role in the failure modes of the reinforced slope.The different pile installation positions will result in three failure modes,including the slope failure occurred behind the pile,the slope failure occurred in front of the pile and the slope failure due to the broken pile.The pile diameter is related to the bending resistance of the pile,and thus determines whether the pile failure occurs or the slope instability occurs of the reinforced slope.
作者
徐斌
陈赟
张楠
于洋
吕庆
Xu Bin;Chen Yun;Zhang Nan;Yu Yang;Lv Qing(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;The Architectural Design&Research Institute of Zhejiang University Co.,Ltd,Hangzhou 310028,China;Zhejiang Construction Investment Group Co.,Ltd,Hangzhou 310012,China;Ocean College,Zhejiang University,Zhoushan 316021,China)
出处
《科技通报》
2020年第4期101-106,共6页
Bulletin of Science and Technology
基金
国家自然科学基金项目(No.41772287,41807224)
浙江省重点研发计划(No.2017C03006)
关键词
桩土相互作用
边坡
抗滑桩
破坏模式
pile-soil interaction
slope
stabilizing pile
failure mode
作者简介
徐斌(1993-),男,浙江宁波人,硕士研究生,研究方向:边坡稳定性评价。E-mail:xnmggg@zju.edu.cn。
