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Simulation Study on the Deformation and Failure Mechanism of Level Rock in Tunnels
(1 China Southwest Research Institute Co. Ltd., Chengdu 611731; 2 State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059)
Abstract Based on an analysis of the material composition and structural mechanical characteristics of tunnel surrounding rock, the deformation and failure mechanism of the surrounding rock in a certain tunnel was qualitatively analyzed, the rational test parameters for the base contact friction experiment were determined and an indoor geological model was established according to in-situ stratum bedding and joint occurrences, with the results indicating that deformation of the surrounding rock can be divided into three phases, i.e., bending and inward heaving, tensile cracking, and breaking and collapsing. This was verified for the tunnelling process using a 2D-UDEC numerical simulation, with the results being basically consistent with that of the laboratory model experiment. Thus it is clear that prediction of the deformation behavior of surrounding rock during tunnelling is possible by adopting this indoor model experiment and UDEC numerical simulation.
Abstract：
Based on an analysis of the material composition and structural mechanical characteristics of tunnel surrounding rock, the deformation and failure mechanism of the surrounding rock in a certain tunnel was qualitatively analyzed, the rational test parameters for the base contact friction experiment were determined and an indoor geological model was established according to in-situ stratum bedding and joint occurrences, with the results indicating that deformation of the surrounding rock can be divided into three phases, i.e., bending and inward heaving, tensile cracking, and breaking and collapsing. This was verified for the tunnelling process using a 2D-UDEC numerical simulation, with the results being basically consistent with that of the laboratory model experiment. Thus it is clear that prediction of the deformation behavior of surrounding rock during tunnelling is possible by adopting this indoor model experiment and UDEC numerical simulation.
LIU ,
PENG 1,
Ji etc
.Simulation Study on the Deformation and Failure Mechanism of Level Rock in Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(3): 82-87
2015, Vol. 52 