Research on Failure Mechanism of Tunnel with Articulated Lining Crossing Strike-slip Fault
(1. CCCC Second Highway Consultants Co., Ltd., Wuhan 430056; 2. Research and Development Center on Tunnel and Underground Space Technology, CCCC, Wuhan 430056;3. State Key Laboratory of Geotechnical Mechanics and Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071; 4. Nanchang Water Resources Bureau, Nanchang 330000)
Abstract：
In this paper, the Xianglushan Tunnel for water conveyance is taken as the case, and small-scale physical model test and numerical simulation methods are used to study response characteristics, failure modes, and failure mechanisms of the articulated tunnel lining under the action of strike-slip fault movement. A comparative analysis was conducted on the internal failure characteristics, overall deformation, and detailed failure modes of tunnels with or without articulated design under the strike-slip fault dislocation. Meanwhile, the longitudinal displacement and stress variation trend of the lining structure, as well as the distribution law of longitudinal internal forces including bending moment and axial shear force, were systematically studied.And the failure mechanism of tunnels crossing strike-slip faults was revealed, and the anti-fault mechanism of articulated tunnels was analyzed. The research shows that: (1) under the movement of the strike-slip fault, the lining strain near the fault zone is relatively large,which is prone to yield failure; (2) The effect of fault movement causes longitudinal cracks to occur in the lining of the active side tunnel. As the movement size increases, the longitudinal cracks gradually evolve into annular cracks,causing upheaval failure of the lining, and at the same time the shape of the lining cross-section becomes elliptical;(3) The failure of articulated lining is mainly concentrated near the fault movement surface, manifested as large angle rotation between lining segments and compression-shear failure of deformation joints within the fault zone.
MA Yalina1,
2 CHEN Yaqi1,
2 LIU Jiguo1 etc
.Research on Failure Mechanism of Tunnel with Articulated Lining Crossing Strike-slip Fault[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(5): 136-147
2023, Vol. 60 