Model test and stress distribution law of unsymmetrical loading tunnel in bedding rock mass
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ORIGINAL PAPER
Model test and stress distribution law of unsymmetrical loading tunnel in bedding rock mass Xinrong Liu 1,2 & Hongjun Chen 1,2 & Kun Liu 1,2 & Chunmei He 1,2
Received: 23 August 2016 / Accepted: 8 March 2017 # Saudi Society for Geosciences 2017
Abstract The exit section of Duck River Tunnel owns characteristics of bedding geology and unsymmetrical loading terrain. A centrifugal model test concerning the destruction process of Duck River Tunnel is conducted. Test results are concluded as follows: The surrounding rock at the bottom of the right sidewall is the first to be destroyed; the fracture planes in surrounding rock on both left and right side lead to the ground surface; the rupture angles are different from homogenous rock mass. Results of numerical model are consistent with the test results. For doing some comparative study, numerical models of homogeneous and bedding rock mass are respectively established. Conclusions are summarized from numerical analysis as follows: The stress distribution law of bedding surrounding rock is basically similar with that of homogeneous surrounding rock, while the stress value of bedding surrounding rock is larger than that of homogeneous rock. Meanwhile, the surrounding rock stress of the structural plane increases or decreases by leaps and bounds, and the stress intensity at the bottom of right sidewall is the highest as well * Hongjun Chen [email protected] Xinrong Liu [email protected] Kun Liu [email protected] Chunmei He [email protected] 1
School of Civil Engineering, Chongqing University, Chongqing 400045, China
2
Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, China
as the surrounding rock, there is also the most easily destructible, which is the same as the test result. The research results have significant reference value to similar projects. Keywords Bedding rock mass . Unsymmetrical loading tunnel . Centrifugal model test . Surrounding rock stress
Introduction Stratified rock mass, which is quite common in rock engineering, owns the properties of discontinuity and nonuniformity owing to the existence of structural plane. Dip angle of stratified rock mass has a significant influence on the stability of rock mass (Kochová et al. 2014). As dip angle of rock stratum and direction of slope are synclastic, it is called bedding (consequent-layer) stratified rock mass (Zhang et al. 2012); otherwise, the inverse-layer stratified rock mass. Sliding failure always happens in bedding slope along structural plane, or shear sliding failure (Chi et al. 2014) through layers exists with a small angle between plane of rock stratum and bedding slope. The inverse-layer slope failure tends to be flexural toppling failure and block failure, which respectively own characteristics of ductility and brittleness (Huang and Song 2013). Stress mechanism of rock mass is more complex during tunneling in stratified rock mass (Fortsakis et al. 2012), research on which is conducted vi
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