Supporting structure for tunnel with weak surrounding rock

Abstract

The invention discloses a supporting structure for a tunnel with a weak surrounding rock. The supporting structure comprises an initial support, an outer support and an inner support, wherein the initial support is installed in a rock body of the surrounding rock tunnel, the outer support is installed between the outer surface of the initial support and the rock body of the surrounding rock tunnel, and the inner support is installed in the initial support. The initial support comprises an upper support, a lower support and fastening bolts, wherein the upper support is in an arc-shaped main view shape, the lower support is in a U-shaped main view shape, and the fastening bolts are used for firmly connecting the upper support with the lower support. The supporting structure can form a three-in-one reinforcing supporting mechanism in the tunnel to stably support the rock body of the surrounding rock tunnel and improve the structural firmness and stability of the whole weak surrounding rock tunnel, and reduce the pressure caused by displacement, shaking and sliding of the rock body of the surrounding rock tunnel and erosion damages to the supporting structure to affect the safe use ofthe weak surrounding rock tunnel when the weak surrounding rock tunnel is in use.

Description

technical field [0001] The invention relates to the technical field of traffic engineering facilities, in particular to a supporting structure for tunnels with weak surrounding rocks. Background technique [0002] Weak surrounding rock generally refers to surrounding rock with weak rock quality, low bearing capacity, developed joints and fissures, and broken structure. The structural surface of the rock mass is weak and easy to slide and collapse; the characteristics of the weak surrounding rock determine its deformation characteristics during the tunnel process, that is, the self-stabilization ability is poor after excavation, showing the characteristics of "short self-stabilization time and easy collapse". The excavation of the tunnel removes the surrounding rock that previously supported the tunnel body, leaving the cave wall empty; the stress of the surrounding rock is readjusted, and both the surrounding rock and the cave wall deform toward the tunnel clearance. [000...

AI Technical Summary

Problems solved by technology

[0004] In the construction process of tunnels with weak surrounding rocks, the support of the tunnel is one of the most important matters. During the support of the tunnel, it is the most important thing to prevent the rock mass of the tunnel with weak surrounding rocks from shifting, sliding, and shaking on the tunnel. Mainly, there is currently a lack of support structures on the market that can solve the problems of poor support firmness and stability, and the displacement and slippage of the surrounding rock tunnel rock mass on the tunnel during tunnel construction.

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