Damping self-resetting tunnel structure for fault fracture zone

Abstract

The invention provides a shock-absorbing self-resetting tunnel structure for a fault fracture zone, which at least comprises a common section and an expanding excavation section corresponding to the fault fracture zone, the expanding excavation section sequentially comprises a primary lining layer, an elastic shock-absorbing layer and a secondary lining layer from outside to inside, the primary lining layer is in contact with surrounding rock, and the elastic shock-absorbing layer is filled with an elastic shock-absorbing material; the second lining layer is formed by sequentially connecting a plurality of pipe joints, and the pipe joints are connected and fixed through memory alloy springs; a reset frame is arranged at the bottom of the second lining layer; reset elastic arms are transversely arranged between the two side faces of the reset frame and the inner wall of the initial lining layer, and elastic damping rods used for damping and electric push rods used for resetting are arranged in the reset elastic arms. The tunnel structure not only has the function of shock absorption and shock resistance, but also can reset the staggered pipe joints after a strong shock occurs, so that the first-aid repair time is greatly shortened, and the passage in the tunnel is recovered as soon as possible.

Description

technical field [0001] The invention belongs to the field of tunnel construction, and in particular relates to a tunnel structure which is used in a fault crush zone and has the function of shock absorption and self-reset. Background technique [0002] The existing tunnel support structure generally includes primary lining and secondary lining. The primary lining is the initial support formed by bolting, hanging nets, shotcrete and other means after the tunnel is excavated. This initial support mainly uses the surrounding rock. The strength forms support; the secondary lining uses reinforced concrete to form a complete reinforced concrete structure inside the primary lining. [0003] When a tunnel passes through a fault or broken zone, the surrounding rock at the fault or broken zone is very broken and has low strength, and is prone to large deformation. When the tunnel crosses the active fault, if there is no corresponding engineering measures to deal with it, the dislocat...

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Problems solved by technology

[0004] In terms of anti-seismic and fracture resistance of cross-fault tunnels, the following measures are mainly taken at present: (1) Improve the mechanical properties of tunnel lining materials to enhance the anti-seismic performance of structures, such as using steel fiber reinforced concrete to increase damping, and polymer concrete to reduce the stiffness, etc.; (2) set damping joints, that is, reduce the length of the lining segment, so that the damage will be concentrated at the joints when the fault is dislocated, so as to ensure the overall performance of the lining; (3) according to the possible displacement of the fault, expand Tunnel cross-sectional size, filling porous material between the outer lining and the inner lining, and offsetting the influence of fault dislocation through the gap between the outer lining and the inner lining, but the overbreak size will be limited by economic factors

[0005] To sum up, although some tunnels currently use isolation energy dissipation design, hinge design, overbreak design and other related measures to construct tunnels across active fault zones, due to the relatively single method and limited ability to resist fault dislocation, it cannot To ensure the safe operation of the tunnel under the condition of fault activity, the task of repairing the tunnel after the fault activity is arduous, and it often takes a lot of manpower, material resources and time to repair it, which affects the normal passage of the tunnel

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