路堤荷载下水泥土搅拌桩复合地基失稳机理及其稳定性分析  

Instability Mechanism of Composite Foundation Reinforced by Soil-cement Mixing Pile Under Embankment Loads

作　　者：聂文峰[1] 邱邵富 张蕊[1] 陈琼[1] NIE Wenfeng;QIU Shaofu;ZHANG Rui;CHEN Qiong(Kunming Survey,Design and Research Institute Co.Ltd.of CREEC,Kunming,Yunnan 650200,Chin)

机构地区：[1]中铁二院昆明勘察设计研究院有限责任公司,云南昆明650200

出　　处：《水利与建筑工程学报》2018年第4期47-51,共5页Journal of Water Resources and Architectural Engineering

基　　金：昆明市官渡区科技计划项目

摘　　要：以水泥土搅拌桩加固软弱路基为研究对象,采用有限元强度折减法建立了群桩条件下的数值分析模型,籍此模型探讨了路堤的整体稳定性,并与传统复合地基极限平衡法所得的计算结果进行了对比分析。结果表明:水泥土搅拌桩的存在限制了路堤和路基潜在滑裂面的形成与贯通,且路堤的安全系数随着桩体抗剪强度的增加呈近似线性增加;水泥土搅拌桩所受的剪力远远小于其自身的抗剪强度。同时指出复合地基极限平衡法不能反映桩体的真实破坏模式,且会高估路堤的稳定性。In this paper the stability analysis of embankment on soft subgrade improved by soil-cement mixing piles is performed using limit equilibrium method and shear strength reduction technique in ABAQUS.The results show that the existence of cement-soil mixing piles limits the formation of potential slip surfaces in embankments.The safety factor of embankment increases approximately linearly with the increase of shear strength of the piles;The shear force of the soil-cement mixing pile is far less that its own shearing resistance.At the same time,it is pointed out that the limit equilibrium method of composite foundation cannot reflect the true failure mode of the pile because it will overestimate the stability of the embankment.

关 键 词：复合地基 水泥土搅拌桩 路堤稳定 极限平衡法 

分 类 号：TU433[建筑科学—岩土工程]