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Application of FEM Strength Reduction Method in Stability Analysis and Control of Tunnel Construction
(1 Chongqing Engineering Research Center of Automatic Monitoring for Geological Hazards, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042; 2 Department of Railway and Construction Engineering, Chongqing Vocational College of Public Transportation, Chongqing 402247; 3 Logistical Engineering University of PLA, Chongqing 401311)
Abstract FEM strength reduction method has been more widely used in the stability analysis of slope engineering rather than tunnel engineering. In this paper the FEM strength reduction method is adopted in a stability analysis and control of tunnel engineering, and a dynamic evaluation on the surrounding rock stability in whole construction process is proposed based on the safety factor. The dynamic controlling indexes of tunnel monitoring and measurement during construction are established by studying the deformation law of tunnel surrounding rocks. The analysis on calculation examples show that the dynamic evolution law of surrounding rock stability during construction can be mastered quantitatively and visually based on the safety factors of rock mass; the corresponding deformation control indexes can be determined for different construction stages under premise of meeting the stability requirements of surrounding rocks after installing primary support so as to overcome the limitation of taking the permissible displacement of surrounding rocks as the criteria of tunnel stability.
Abstract：
FEM strength reduction method has been more widely used in the stability analysis of slope engineering rather than tunnel engineering. In this paper the FEM strength reduction method is adopted in a stability analysis and control of tunnel engineering, and a dynamic evaluation on the surrounding rock stability in whole construction process is proposed based on the safety factor. The dynamic controlling indexes of tunnel monitoring and measurement during construction are established by studying the deformation law of tunnel surrounding rocks. The analysis on calculation examples show that the dynamic evolution law of surrounding rock stability during construction can be mastered quantitatively and visually based on the safety factors of rock mass; the corresponding deformation control indexes can be determined for different construction stages under premise of meeting the stability requirements of surrounding rocks after installing primary support so as to overcome the limitation of taking the permissible displacement of surrounding rocks as the criteria of tunnel stability.
TANG Xiaosong1,
2 ZHENG Yingren3 WANG Yongfu1
.Application of FEM Strength Reduction Method in Stability Analysis and Control of Tunnel Construction[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(3): 49-55
2020, Vol. 57 