基于两种方法的铁路隧道弃渣场抗滑稳定性分析  

Slip Stability Analysis of a Railway Tunnel Residues Disposal Area Based on the Strength Reduction Method and the Limit Equilibrium Method

作　　者：郑良静 ZHENG Liangjing(China Railway 2181 Bureau Group Co.Ltd.,Lanzhou Gansu 730070,China)

机构地区：[1]中铁二十一局集团有限公司,甘肃兰州730070

出　　处：《铁道建筑技术》2020年第8期67-70,共4页Railway Construction Technology

基　　金：甘肃省建设科技攻关项目(JK2016-26)。

摘　　要：目前针对弃渣场抗滑稳定性安全系数求解方法,规范推荐使用传统极限平衡法。通常边坡稳定的安全系数与滑动面的位置关系密切,要确定安全系数必须首先明确滑动面的位置。由于弃渣堆积体多孔多相不均匀,结构松散欠密实,传统方法在确定破坏面形态方面存在困难。本文以新建铁路敦格线阔克萨隧道弃渣场为例,介绍一种较为实用且稳妥的计算弃渣场抗滑稳定安全系数的方法。首先采用基于强度折减的有限元法对边坡稳定性进行初步分析,得到破坏面的位置和形态,然后采用传统极限平衡法,通过调整搜索参数,得到与前者位置和形态相似的滑动面,通过计算得出安全系数。At present,the traditional limit equilibrium method is recommended for solving the safety coefficient of slip stability in residues disposal area.In general,the safety factor of slope stability is closely related to the position of the sliding surface.Because residues disposal volume is porous and heterogeneous,the structure is loose and underdense,the traditional method is difficult to determine the failure surface.In this paper,a practical and reliable method for calculating the safety factor of slip stability in the residues disposal area of Kuokesa Tunnel in new Dun-Ge railway is introduced.Firstly,the finite element method based on strength reduction is used to preliminarily analyze the stability of the slope and obtain the position and shape of the failure surface.Then,the traditional limit equilibrium method is used to obtain the critical sliding surface which is similar with the former position and shape by adjusting the searching parameters,and the safety coefficient is calculated.

关 键 词：弃渣场稳定性 临界滑动面 强度折减 法极限平衡法 

分 类 号：TU43[建筑科学—岩土工程]