Support pressure for circular tunnels in two layered undrained clay

作     者：Bibhash Kumar Jagdish Prasad Sahoo Bibhash Kumar;Jagdish Prasad Sahoo

作者机构：Department of Civil EngineeringNational Institute of TechnologyUttarakhand246174India Department of Civil EngineeringIndian Institute of TechnologyRoorkee247667India 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2020年第12卷第1期

页      面：135-148页

核心收录：

学科分类：08[工学] 0818[工学-地质资源与地质工程] 080104[工学-工程力学] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 0801[工学-力学（可授工学、理学学位）] 

主　　题：Finite elements Layered clay Limit analysis Stability of tunnels 

摘      要：To estimate the required support pressure for stability of circular tunnels in two layered clay under undrained condition,numerical solutions are developed by performing finite element lower bound limit analysis in conjunction with second-order cone *** support system is assumed to offer uniform internal compressive pressure on its *** the literature,it is known that the stability of tunnels depends on the overburden pressure acting over it,which is a function of undrained cohesion and unit weight of soil,and cover of *** a tunnel is constructed in layered undrained clay,the stability depends on the undrained shear strength,unit weight,and thickness of one layer relative to the other *** the present study,the solutions are presented in a form of dimensionless charts which can be used for design of tunnel support systems for different combinations of ratios of unit weight and undrained shear strength of upper layer to those of lower layer,thickness of both layers,and total soil cover depth.