Determination of Supporting Time of Tunnels in the Xigeda Stratum Based on the Convergence-Confinement Method

Author:

Zhong Zuliang12ORCID,Tang Tenglong12,Li Yapeng12

Affiliation:

1. College of Civil Engineering, Chongqing University, Chongqing 400045, China

2. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China

Abstract

The mechanical properties of the surrounding rock of the Xigeda stratum are easily affected by water content. In order to obtain the support characteristics of Xigeda strata, the finite difference method was used to obtain the longitudinal deformation of the surrounding rock at a certain distance from the tunnel excavation face under different water contents. Then, the longitudinal deformation profiles of a Xigeda stratum tunnel were obtained under different water content conditions. The accuracy and applicability of the results were verified through error analysis and comparison with existing research results. Based on the convergence-confinement principle, it is proposed that the best time to apply support is when the displacement increment of the surrounding rock has a sharp increase point. The support construction time under different water content conditions was obtained with the distance from the tunnel excavation face as the control index. The results show that with the increase in water content, the longitudinal deformation profile’s growth trend is steeper near the excavation surface and it is gentler when the distance from the excavation face becomes large. At a water content of 20%, the support should be applied 2.67 m behind the excavation face; at a water content of 25%, the support should be applied 1.46 m behind the excavation face. The result has a certain guiding significance for the safety of tunnel construction in the Xigeda stratum.

Funder

the National Science Foundation of China

Publisher

MDPI AG

Subject

Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science

Reference37 articles.

1. Some problems in study of the genesis of Xigeda Formation;Xu;Earth Sci. Front.,2011

2. In-situ direct shear test on Xigeda Formation clay stone and siltstone;Zhou;J. Cent. South Univ. (Sci. Technol.),2014

3. Study of microstructure and mechanical properties of semi-diagenetic rock of Xigeda Formation;Du;Rock Soil Mech.,2020

4. Geo-engineering descriptions and damage characteristics assessment for Xigeda formation, Yunnan Province, China;Fu;Environ. Earth Sci.,2021

5. Study on the influence of water content to shear strength of Xigeda-strata clay rock in Xichang;Zhang;Geotech. Investig. Surv.,2011

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3