Research on the large deformation mechanism and control measures of a layered soft rock tunnel

被引:3
|
作者
Sun, Xiaoming [1 ,2 ]
Qi, Zhenmin [1 ,2 ]
Miao, Chengyu [1 ,2 ]
Wang, Jian [1 ,2 ]
Zhang, Jiaxuan [1 ,2 ]
Jiang, Ming [1 ,2 ]
机构
[1] China Univ Min & Technol Beijing, State Key Lab Geomech & Deep Underground Engn, Beijing 100083, Peoples R China
[2] China Univ Min & Technol Beijing, Sch Mech & Civil Engn, Beijing 100083, Peoples R China
基金
中国国家自然科学基金;
关键词
Tunnel engineering; Layered rock mass; Similar materials; Model experiments; Numerical simulation; FAILURE-MECHANISM; NUMERICAL-SIMULATION; MODEL TESTS; BEHAVIOR; FRACTURE; PLANE; MASS;
D O I
10.1007/s10064-023-03467-y
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Located on the Qinghai-Tibet Plateau northeast edge, the Muzhailing Tunnel has complex geological conditions: a large buried depth, high in situ stress, developed bedding, and weak-fractured rock mass. Strong deformation and serious damage occur during tunnel construction. Taking the 3# inclined shaft as an engineering example, a large-scale geomechanical model experiment for tunnel excavation and loading under different lateral pressure coefficients is performed to reveal the deformation evolution process and stress-strain characteristics of layered soft rock tunnel surrounding rock. With increasing lateral pressure coefficient, tunnel cracks develop, the bedding slides and surrounding rocks deform. When the lateral pressure coefficient is greater than 1.5, the tunnel is severely deformed and damaged. A numerical model is established to analyse the surrounding rock deformation and stress during the whole process, and the surrounding rock deformation laws under different bedding inclinations and bedding spacings are studied. With increasing bedding inclination, the maximum displacement occurs in the bedding normal direction and develops from the top and bottom plates to both sides, in which the largest deformation occurs in the tunnel right shoulder for a bedding dip angle of 45 degrees. With increasing bedding spacing, the maximum displacement decreases and progresses from the bottom to top plate, and a sudden change in deformation occurs at the bedding interface. Finally, based on the bedded rock mass failure law, asymmetric coupling support measures with high-prestress constant-resistance anchor cables as the core are proposed and applied in the field. The monitoring results show a good large deformation control effect, which can provide a reference for similar projects.
引用
收藏
页数:19
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