Large Deformation Characteristics and Control Measures of Surrounding Rock in Altered Granite Stratum of High Ground Stress Tunnel

被引：0
|
作者：
Fang X. [1 ]
Yang Z. [2 ]
Yang J. [1 ]
Peng X. [2 ]
Tang Y. [2 ]
Liu W. [1 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
[2] The First Engineering Co., Ltd., China Railway No.5 Bureau Group, Changsha
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2020年 / 41卷 / 05期
关键词：
Altered granite stratum; High ground stress; Surrounding rock deformation; Surrounding rock deformation control; Tunnel;
D O I：
10.3969/j.issn.1001-4632.2020.05.11
中图分类号：
学科分类号：
摘要：
During the construction of Zangga Tunnel crossing the jointed altered granite stratum with high ground stress, the deformation of surrounding rock presented the characteristics of the large amount of deformation, fast deformation rate, horizontal convergence greater than vertical settlement, and long duration. By means of numerical simulation method, the original support design scheme proposed at the initial stage of construction was analyzed to verify the rationality of the established model and its parameters. Through numerical simulation and field test, a comprehensive control measure of surrounding rock deformation was proposed, which mainly included adjusting the curvature of the side wall, combining long and short bolts, and double-layer primary support. Numerical simulation results show that after adopting the comprehensive control measures, the deformation value of the surrounding rock is controlled, the deformation rate of surrounding rock is significantly reduced, the plastic zone of the surrounding rock of the arch wall is small, the safety factor of the primary support structure meets the requirements, and the stability of the surrounding rock and support structure can be ensured. After applying comprehensive control measures in the field test section, the amount, rate and duration of surrounding rock deformation can be controlled. The convergence rate of surrounding rock deformation is fast, the construction effect is good, and the construction efficiency is greatly improved. © 2020, Editorial Department of China Railway Science. All right reserved.
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页码：92 / 101
页数：9
相关论文
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