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Effect of Rock Mechanical Parameters on Stability of Tunnel Surrounding Rocks
(1 China Railway Southwest Research Institute Co. Ltd, Chengdu 611731; 2 Chongqing Tongyue Expressway Co., Ltd. Chongqing 400000; 3 College of Resources and Environmental Sciences, Chongqing University, Chongqing 400030)
Abstract The effects of mechanical parameters of rock mass on horizontal convergence, crown settlement and fac? tor of plastic zone were studied by an orthogonal numerical simulation test. The 6 factors (elastic modulus, poisson ratio, internal friction angle, tensile strength, cohesion and density) and the orthogonal test program of three level were selected, and the test results were analyzed by ANOVA. The results show that the horizontal convergence is affected by the following factors in a sequence of cohesioin, elastic modulus, internal friction angle, tensile strength and Poisson ratio; the crown settlement is affected by the following factors in a sequence of cohesion, internal friction, elastic modulus, tensile strength and Poisson ratio; the plastic zone is affected by the following factors in a sequence of internal friction angle and cohesion, while the density has little effect on stability of tunnel surrounding rocks; the test results agree with the results from orthogonal test in condition of change of any mechanical parameter of tock mass; a comprehensive consideration should be given to the horizontal convergence, crown settlement and plastic zone after tunnel excavation in view of stability of tunnel surrounding rocks. Reasonable support method was proposed regarding the construction of Sanquan tunnel with the surrounding rock of grade V, and it proves that the surrounding rocks are stable by numerical analysis and site monitoring and measurement.
Abstract：
The effects of mechanical parameters of rock mass on horizontal convergence, crown settlement and fac? tor of plastic zone were studied by an orthogonal numerical simulation test. The 6 factors (elastic modulus, poisson ratio, internal friction angle, tensile strength, cohesion and density) and the orthogonal test program of three level were selected, and the test results were analyzed by ANOVA. The results show that the horizontal convergence is affected by the following factors in a sequence of cohesioin, elastic modulus, internal friction angle, tensile strength and Poisson ratio; the crown settlement is affected by the following factors in a sequence of cohesion, internal friction, elastic modulus, tensile strength and Poisson ratio; the plastic zone is affected by the following factors in a sequence of internal friction angle and cohesion, while the density has little effect on stability of tunnel surrounding rocks; the test results agree with the results from orthogonal test in condition of change of any mechanical parameter of tock mass; a comprehensive consideration should be given to the horizontal convergence, crown settlement and plastic zone after tunnel excavation in view of stability of tunnel surrounding rocks. Reasonable support method was proposed regarding the construction of Sanquan tunnel with the surrounding rock of grade V, and it proves that the surrounding rocks are stable by numerical analysis and site monitoring and measurement.
CHEN Xi1 ZHAO Yong2 YANG Yushun3
.Effect of Rock Mechanical Parameters on Stability of Tunnel Surrounding Rocks[J] MODERN TUNNELLING TECHNOLOGY, 2019,V56(5): 77-84
2019, Vol. 56 