Application of two-level design method on subway tunnel crossing active fault: a case study on Urumqi subway tunnel intersected by reverse fault dislocation

Abstract

The tunnel crossing active fault is severely damaged under the action of fault dislocation. Considering the "economic and safety" principle in engineering design, the tunnel damage should be effectively reduced. In this work, a two-level design method for fault dislocation was proposed and the Urumqi subway tunnel in China was chosen as a typical model to deeply investigate its application feasibility. Based on the definition of the design events of different levels and corresponding design goals, threedimensional finite element soil-tunnel models were established to estimate the response of tunnel. Meanwhile, the rationality of soil-tunnel model was judged by tunnel deformation and internal forces distribution characteristics analysis, and the two-level design goals were evaluated by comparing tunnel damage degree and volumes. The results suggest that under the condition of fault dislocation, the tunnel without disaster mitigation method suffers severely shear, tensile-crack, and compressive damage, which may eventually induce the tunnel collapse. The tunnel damage is reduced significantly by adopting the method of flexible joint. For Urumqi subway tunnel with flexible joints, both of the two-level design goals are effectively realized.

Design of Faster R-CNN-Based Fault Detection Method for Subway Vehicles

“…Here are the following parts of the pantograph: (1) carbon slide plate, (2) bracket, (3) balance bar, (4) upper frame, (5) hinge seat, (6) lower arm bar, (7) sector plate, (8) buffer valve, (9) drive cylinder, (10) piston, (11) lowering bow spring, (12) link insulator, (13) slip ring, ( 14) link rod, (15) support insulator, (16) raising bow spring, (17) bottom frame, and (18) push rod. After the pantograph of a subway rail vehicle is raised and meets the overhead contact network, current is obtained from the contact network and transmitted to the vehicle electrical system.…”

“…This leads to low frequency of environmental monitoring, large sampling errors, and inaccurate monitoring data and cannot reflect the environmental quality in a timely manner. Therefore, it is of great significance to strengthen the equipment fault monitoring to ensure the normal operation of the equipment and improve the safety and reliability of the equipment [7,8]. Currently, equipment defect detection research is mostly focused on the analysis of infrared thermal pictures of equipment.…”

Study on the Mechanical Response Mechanism and Damage Behavior of a Tunnel Lining Structure under Reverse Fault Dislocation

“…Scholars at home and abroad [19][20][21][22][23][24][25][26][27] have conducted in-depth research by means of mutual verification, such as model tests and numerical simulation. However, the current research has mainly focused on the macroscopic mechanical and deformation response of fault activity in the tunnel structure, and the research on the damage behavior of the railway tunnel lining structure under reverse fault dislocation is insufficient.…”

Investigating the Deformation and Failure Mechanism of a Submarine Tunnel with Flexible Joints Subjected to Strike-Slip Faults

“…Zhong et al [18] proposed two quantitative damage indices, namely the overall structural damage index and the concrete lining crack width, to study the structural integrity and availability of the water conveyance tunnel under fault movements. An et al [19] proposed a two-level design method to be applied to shallow urban tunnels under fault dislocation. The results show that the two-level design content during fault dislocation is consistent with that of seismic design.…”