Citation Search Quick Search
  2023, Vol. 42 Issue (3): 768-779    DOI: 10.13722/j.cnki.jrme.2022.0339
Artiles Current Issue | Archive | Adv Search |
Influence mechanism of water content on tunnel stability in silty clay layer
MA Kaimeng1,ZHANG Junru1,XU Jian1,CHEN Xuefeng2,REN Zhaodan2,FENG Jimeng1
 (1. School of Civil Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;2. China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan,Hubei 430063,China)
Download: PDF (65274 KB)   HTML (1 KB) 
Export: BibTeX | EndNote (RIS)      
Abstract  The water content of silty clay stratum varies widely and greatly affects the mechanical properties. The water content of silty clay stratum has great influence on tunnel stability. Thus,based on Dayingpo tunnel of Yangliu-Xuanwei expressway,the influence of water content change on the stability of tunnels in silty clay stratum was studied. Firstly,the deformation characteristics and deformation mechanism of the unstable section of Dayingpo tunnel were analyzed. The mechanical parameters of silty clay with different water content were obtained by triaxial compression test. Secondly,based on the experimental data,the influence mechanism of silty clay water content change on tunnel stability was studied by numerical calculation method. Finally,the criterion for determining the instability of silty clay tunnel was proposed. The results show that:(1) the silty clay in this area has strong water sensitivity,and its mechanical properties deteriorate significantly with the increase of water content. When the water content reaches 40%,its shear strength and elastic modulus are only 10%–20% of that when water content is 15%. The increase of water content causes the overall settlement of the tunnel,and the maximum settlement of dayingpo tunnel is 76.7 cm. (2) According to the water content,the stability of silty clay tunnel can be divided into four stages:stable stage(15%–25%),early warning stage(25%–27.5%),alarm stage(27.5%–wcr) and unstable stage(>wcr). (3) The increase of water content of surrounding earth in the arch foot area leads to insufficient foundation bearing capacity and insufficient support resistance,which is the main reason for overall subsidence,misplacement and serious intrusion of initial support.
Key wordstunnelling engineering      highway tunnel      instability mechanism      triaxial compression test      silty clay      moisture content     
Service
E-mail this article
Add to my bookshelf
Add to citation manager
E-mail Alert
RSS
Articles by authors
MA Kaimeng1
ZHANG Junru1
XU Jian1
CHEN Xuefeng2
REN Zhaodan2
FENG Jimeng1
Cite this article:   
MA Kaimeng1,ZHANG Junru1,XU Jian1, et al. Influence mechanism of water content on tunnel stability in silty clay layer[J]. , 2023, 42(3): 768-779.
URL:  
http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0339      OR      http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I3/768
Copyright © 2005-2015 Edited and Published by Editorial Office for Chinese Journal of Rock Mechanics and Engineering
Sponsored by : Chinese Society for Rock Mechanics and Engineering 
Published by : Science Press 
Address: Wuhan 430071, China  Tel: (027)87199250  Fax: (027)87199250  Email: rock@whrsm.ac.cn
DESIGNED BY: Beijing Magtech Science & Technolgy Development Co.,Ltd.
鄂公网安备 42010602003581号