地下水对管廊基坑岩质边坡稳定性的影响研究  

Influence of Groundwater on Rock Slope Stability of Utility Tunnel Foundation Pit

作　　者：王家全[1] 常志凯 林桂武[1] 林志南 钟张宝 胡锋 WANG Jiaquan;CHANG Zhikai;LIN Guiwu;LIN Zhinan;ZHONG Zhangbao;HU Feng(College of Civil and Architectural Engineering,Guangxi University of Science and Technology,Liuzhou 545006,Guangxi,China;China Railway 25 Bureau Group No.4 Engineering Co.,Ltd.,Liuzhou 533000,Guangxi,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006 [2]中铁二十五局集团第四工程有限公司,广西柳州533000

出　　处：《水力发电》2021年第7期43-47,59,共6页Water Power

基　　金：国家自然科学基金资助项目(41962017);广西自然科学基金项目(2017GXNSFAA198170);广西高等学校高水平创新团队及卓越学者计划项目(桂教人才[2020]6号);广西高校中青年教师科基础能力提升项目(2020KY08023)。

摘　　要：以广西某管廊项目为工程背景,针对潜水面和基坑水位线变化影响管廊基坑岩质边坡稳定性的问题,建立三维数值模型,从位移、应力、变形模式等方面,探讨潜水面和基坑水位线对边坡稳定性的影响。结果表明,基坑积水的水位线高度对边坡安全系数的影响程度远大于潜水面高度;岩质切向边坡的岩层分界面具有一定倾角并暴露于边坡临空面时,分界面上部岩层极易向边坡临空面方向滑移;随着基坑水位线高度的增加,高陡层状岩质边坡失稳方式由局部楔形体滑动破坏转化为平面破坏。Aiming at the problem that the changes of water table and water line of foundation pit have adverse effects on the stability of rock slope of utility tunnel foundation pit which is based a utility tunnel project in Guangxi,a three-dimensional numerical model is established by FLAC3D finite difference software to analyze the stability of utility tunnel foundation pit from the aspects of displacement,stress and deformation mode,and discusses the influence of water line and water table to the foundation pit on the stability of slope.The results show that,(a)the influence of the water line on the safety factor of slope is much greater than that of the water table to the foundation pit;(b)the rock strata at the interface are easy to slip towards the face of slope when the rock slope is tangential and the rock interface with a certain dip angle is exposed to the facing surface of slope;and(c)the failure mode of slope is transformed from sliding failure of local wedge deformation on the rock surface to plane failure with the increase of the water level of foundation pit.

关 键 词：边坡稳定 管廊基坑 潜水面 基坑水位线 FLAC3D 

分 类 号：TU457[建筑科学—岩土工程]