CN-116498341-B - Tunnel crossing movable fault structure

CN116498341BCN 116498341 BCN116498341 BCN 116498341BCN-116498341-B

Abstract

The invention discloses a tunnel crossing movable fault structure design system, and belongs to the field of tunnel construction. The tunnel crossing movable fault structure design system comprises a displacement space, a supporting system and a tunnel structure, wherein the supporting system comprises a vertical supporting system and a transverse hinge constraint system, the displacement space, the supporting system and the tunnel structure are all positioned in surrounding rock at a movable fault, the supporting system and the tunnel structure are positioned in the displacement space, the vertical supporting system is respectively connected with the inner wall of the displacement space and the tunnel structure, and the transverse hinge constraint system is positioned at two sides of the tunnel structure and is respectively connected with the outer wall of a side wall of the tunnel structure and the outer wall of the displacement space. The tunnel crossing active fault system has wide application range, can realize that the tunnel can be stable at an initial position and can keep the supporting force constant when fault moves, thereby achieving the purpose of fault fracture resistance.

Inventors

LI GEN
JIANG SHUAI

Assignees

大连理工大学

Dates

Publication Date: 20260512
Application Date: 20230419

Claims (6)

1. The tunnel crossing movable fault structure is characterized by comprising a displacement space, a tunnel structure and a supporting system; the displacement space is positioned in surrounding rock at the position crossing the fault; The tunnel structure is positioned in the displacement space; the support system comprises a vertical support system and a transverse hinge constraint system, and is positioned in the displacement space and outside the tunnel structure; When fault dislocation occurs, the tunnel structure keeps the initial position unchanged and moves up and down freely in a displacement space, the vertical supporting system adjusts the vertical supporting force born by the tunnel structure by controlling the weight of the balance weight, the provided vertical supporting force keeps unchanged when the fault dislocation occurs, and the transverse hinge constraint system provides transverse displacement constraint for the tunnel but does not constrain the vertical displacement of the tunnel structure; The vertical supporting system is used for expanding the supporting force of the carrier rope on the tunnel structure, the expansion multiple is regulated by controlling the number of the movable pulley blocks, the vertical supporting system comprises a movable pulley system, a fixed anchor rope, a fixed structure, the carrier rope and a weight, wherein the fixed anchor rope and the fixed pulley system are correspondingly fixed on the inner wall of a displacement space, the fixed structure is fixed on the outer wall of the tunnel structure, the fixed structure is used for fixing the movable pulley blocks, the carrier rope is wound on the movable pulley blocks, the fixed pulley system and the fixed anchor rope, the two ends of the carrier rope are connected with weight blocks, and the displacement space comprises a space for reserving the weight to move up and down; The fixed structure comprises a force bearing rod, a base, a pin bolt and a rotating member, wherein the base is fixed on the outer wall of the tunnel structure, the rotating member is connected with the force bearing rod, the force bearing rod is connected with the movable pulley block, the base is connected with the rotating member through the pin bolt, and the rotating member can rotate around the pin bolt; The transverse hinge constraint system is positioned in the displacement space, two ends of the transverse hinge constraint system are respectively fixed on the outer wall of the side wall of the tunnel structure and the inner wall of the displacement space, the transverse hinge constraint system is formed by arranging chain rods along the vertical direction, and the transverse hinge constraint system is used for constraining the transverse displacement of the tunnel structure because each chain rod is not telescopic, and does not constrain the vertical displacement of the tunnel structure because the vertical direction of the transverse hinge constraint system is a movable system.
2. The tunnel traversing movable fault structure according to claim 1, wherein a displacement space is reserved between the tunnel structure and surrounding rock, and the cross section of the displacement space is elliptical.
3. The tunnel traversing active fault structure according to claim 1, wherein, The length L of the displacement space in the longitudinal direction of the tunnel should satisfy the following formula: wherein f is the fault amount, ω is the standard error tolerance,%; The longitudinal length of the displacement space is determined according to the deformation control standard of the tunnel structure, and the profile of the inner wall of the longitudinal section is an S-shaped curve.
4. The tunnel traversing movable fault structure according to claim 1, wherein the vertical support system adjusts a vertical support force acting on the tunnel structure by controlling a weight of a weight.
5. The tunnel traversing active fault structure according to claim 1, wherein the vertical support systems and the lateral hinge constraint systems are staggered to spatially avoid mutual interference.
6. The tunnel traversing movable fault structure according to claim 1, wherein the tunnel structure comprises a highway tunnel, a railway tunnel, a diversion tunnel, and various pipe lanes.

Description

Tunnel crossing movable fault structure Technical Field The invention belongs to the technical field of tunnel construction, and particularly relates to a fault-resistant structure for tunnel crossing active faults. Background The scheme mainly adopted when the tunnel passes through the active fault at present has the following defects: 1. the method is characterized in that the method can be wound, after the early geological survey, the faults (Song Yuxiang, liu Yong, main braiding and tunnel engineering) are avoided as much as possible when the tunnel is selected, the method is limited by factors such as geographical conditions and the like, and only part of engineering is applicable. 2. The rigidity of the tunnel itself is enhanced by rigid protective measures (e.g., increasing the strength of the material, anchor spray support, etc.) to resist additional loads imposed on the structure due to fault dislocation (Deng Zhongfu. Segmental tunnel design parameters and safety analysis under fault dislocation [ J ]. Western traffic science and technology, 2021, no. 162 (01): 126-130), but this approach will greatly increase construction costs and practice has proven that this approach is not significant. 3. The tunnel is provided with flexible connecting sections, and the tunnel can deform along with fault dislocation by adopting more flexible materials or structures near the fault fracture layer, so that additional internal forces (Li Guoliang, zhang Jing, liu Guoqing, and the like) generated by fault dislocation are reduced. 4. The super-digging design is that the normal use function is met when the section of the tunnel is staggered by enlarging the section of the tunnel, the enlarging amount is determined according to the staggered amount of faults (Jiang Shubing, li Peng, lin Zhi. The anti-break design countermeasure of the tunnel crossing the movable fault area [ J ]. Chongqing university of traffic report (natural science edition), 2008,27 (06): 1034-1036+1041.), but the method still cannot avoid the fault generated by the tunnel structure at the fault position and needs regular repair. Based on the problems, the invention provides a tunnel crossing active fault structure, which can keep the tunnel constantly positioned at the initial position and the stress constantly when fault dislocation is realized, thereby achieving the purpose of fault fracture resistance. Disclosure of Invention The invention provides a tunnel crossing movable fault structure, which can keep the tunnel stable in an initial position and keep the stress constant when the fault moves, thereby achieving the purpose of fault fracture resistance. The technical scheme of the invention is as follows: a tunnel crossing movable fault structure comprises a displacement space, a tunnel structure and a support system; the displacement space is positioned in surrounding rock at the position crossing the fault; The tunnel structure is positioned in the displacement space; the support system comprises a vertical support system and a transverse hinge constraint system, and is positioned in the displacement space and outside the tunnel structure; When fault dislocation occurs, the tunnel lining structure keeps the initial position unchanged and moves up and down freely in the displacement space, the vertical supporting system adjusts the vertical supporting force born by the tunnel structure through controlling the weight of the weight, the vertical supporting force provided by the vertical supporting system keeps unchanged when fault dislocation occurs, and the transverse hinge constraint system provides transverse displacement constraint for the tunnel but does not constrain the vertical displacement of the tunnel structure. And a displacement space is reserved between the tunnel structure and the surrounding rock, and the cross section shape of the displacement space comprises but is not limited to an ellipse. The length L of the displacement space in the longitudinal direction of the tunnel should satisfy the following formula: wherein f is the fault amount, ω is the standard error tolerance,%; The longitudinal length of the displacement space is determined according to the deformation control standard of the tunnel structure, and the profile of the inner wall of the longitudinal section of the displacement space comprises, but is not limited to, an S-shaped curve. The vertical supporting system is used for expanding the supporting force of the carrier rope on the tunnel structure, the expansion multiple is regulated by controlling the number of the movable pulley blocks, the vertical supporting system comprises a movable pulley system, a fixed anchor rope, a fixed structure, the carrier rope and a weight, the fixed anchor rope and the fixed pulley system are correspondingly fixed on the inner wall of a displacement space, the fixed structure is fixed on the outer wall of the tunnel structure, the fixed structure is used for fixing the movable