Double-layer molded composite lining for weak surrounding rock tunnel

Abstract

The invention discloses a double-layer molded composite lining for a weak surrounding rock tunnel. The lining can reduce the construction difficulty, ensure the engineering quality, ensure structural stress stability and construction safety and reduce the engineering cost at the same time. The lining comprises an initial molded concrete layer, a secondary molded concrete layer and a waterproof layer; after the surrounding rock of the tunnel is dug, an initial supporting system of anchor rods, a reinforcing mesh, the initial molded concrete layer and the like is arranged; the secondary molded concrete layer is arranged outside the initial molded concrete layer; the waterproof layer is arranged between the initial molded concrete layer and the secondary molded concrete layer; and the initial molded concrete layer and the secondary molded concrete layer form a composite lining system together.

Description

1. Technical field [0001] The patent of the present invention relates to a tunnel support structure, in particular to a double-layer molded composite lining for tunnels with weak surrounding rocks. The invention also relates to a method for realizing the double-layer mold-built composite lining of the soft surrounding rock tunnel. 2. Background technology [0002] With the construction of large-scale, modernized and high-standard urban roads and transportation projects in my country, the number and construction scale of tunnel projects continue to expand, and weak surrounding rock strata will inevitably be encountered. Weak surrounding rock is descriptively defined as a rock mass with loose structure, poor cementation, broken, swelling, weathering, low strength, large pores, significantly affected by structural plane cutting and weathering, or containing a large amount of expansive clay minerals; its index Defined as the uniaxial compressive strength of 0.5 ~ 25MPa and σ c...

AI Technical Summary

Problems solved by technology

However, under the complex hydrogeological conditions of weak surrounding rock formations, especially in weak and broken surrounding rocks with rich groundwater, it is difficult for shotcrete to meet the construction requirements. Spray bonding forms support around the tunnel, and the amount of rebound is large; in areas with strict surface settlement requirements, the initial support is required to have greater rigidity and thickness, and it is very labor-intensive and time-consuming to achieve sufficient thickness of shotcrete. The material is wasted due to the large amount of rebound, and the thickness requirement cannot be met in a short time, which brings difficulties to the construction

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