Tunnel anti-seismic supporting system suitable for high seismic intensity area crossing faults

Abstract

The invention discloses a tunnel anti-seismic supporting system suitable for high seismic intensity area crossing faults, and relates to the field of tunnel supporting. The supporting system comprises a common supporting section, a grouting transition section and an anti-seismic supporting section, wherein the grouting transition section joints the common supporting section to the anti-seismic supporting section; the anti-seismic supporting section comprises a top arch anti-seismic structure and a bottom arch anti-seismic structure, wherein the top arch anti-seismic structure comprises a primary supporting anti-seismic layer, a secondary lining anti-seismic outer layer, a steel plate mould, a damping spring, a rubber cushion layer and a secondary lining anti-seismic inner layer; the primary supporting anti-seismic layer and the secondary lining anti-seismic outer layer are arranged on the inner side of a surrounding rock in sequence, the rubber cushion layer is embedded in the middle of the inner side of the secondary lining anti-seismic outer layer, and the steel plate mould and the damping spring are arranged at two ends between the secondary lining anti-seismic outer layer and the secondary lining anti-seismic inner layer. The supporting system eliminates the influence of diastrophism and displacement of relatively big crossing faults on the internal force of the supporting structure and further improves the anti-seismic property of a tunnel, and multiple unit bodies can be select and adopted to combine according to actual conditions.

Description

technical field [0001] The invention relates to the field of tunnel support, in particular to an anti-seismic support system for tunnels crossing faults in high-intensity areas. Background technique [0002] In recent years, with the increase in the number of underground structures and the frequent occurrence of strong earthquakes around the world, the earthquake resistance of underground structures has been paid more and more attention by seismologists all over the world. In some large tunnel projects, it is inevitable to pass through active faults or high-intensity earthquakes. There are no clear guidelines and norms for the construction of mountain tunnels crossing or paralleling faults under the action of the near-field. At present, when mountain tunnels in high-intensity earthquake areas are constructed across active faults or weak fracture zones, there are mainly the following types of supports: Protection form: [0003] (1) For the pre-reinforced structure, the seism...

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Problems solved by technology

[0005] (3) Set up damping joints. Due to the short length of the damping joints (2-3cm), they can only play a very limited role and are not suitable for use in fault areas with large displacements.

[0006] (4) Section expansion and excavation structure. In the case of a small fault zone width, expansion excavation is the simplest and most effective anti-fault protection method. However, if the tunnel passes through a large fault zone area, the method of expanding the tunnel cross section will be significant. Increase the excavation area and project cost, prolong the tunnel construction period

The invention utilizes the combination of shock absorbing joints, excavation expansion and shock absorbing layers, and the "T" shaped shock absorbing joints and "one" shaped shock absorbing joints set on active faults that can expand and expand longitudinally along the tunnel. The combination of these anti-seismic measures can achieve a better anti-seismic effect, but it does not fundamentally solve the problem of supporting across large-scale active fault zones, and it is necessary to greatly expand the excavation of the tunnel section, and the construction safety risk at the fault is further increased. improve

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