High-ground-stress weak surrounding rock tunnel supporting structure and construction method thereof

Abstract

The invention discloses a high-ground-stress soft surrounding rock tunnel supporting structure and a construction method thereof, and belongs to the technical field of traffic engineering facilities.The high-ground-stress soft surrounding rock tunnel supporting structure includes weak surrounding rock and an intelligent control circuit arranged on one side of the weak surrounding rock. A threadedanchor rod is connected inside the weak surrounding rock in an embedded mode, a surrounding rock sealing layer is poured at the position, corresponding to the threaded anchor rod, of the inner arc surface of the weak surrounding rock, and the threaded anchor rod is located in a sealing layer buffer opening formed in the surface of the surrounding rock sealing layer. Through the mutual cooperationof the designed surrounding rock sealing layer, a water-resisting layer, a cushion plate, an inner supporting body, a torsion spring, the threaded anchor rod, a first nut and a second nut, the abnormality change and rapidly expansion of the weak surrounding rock are avoided, with the cooperation of the surrounding rock sealing layer and the water-resisting layer, the surrounding rock sealing layer has the windproof, sealing and stable abilities, and the water-resisting layer can prevent water in the weak surrounding rock from seeping out and eroding a tunnel.

Description

technical field [0001] The invention belongs to the technical field of traffic engineering facilities, and in particular relates to a tunnel support structure with high ground stress and weak surrounding rock and a construction method thereof. Background technique [0002] High in-situ stress is a concept in geology, which refers to the ratio of rock compressive strength to in-situ stress. High ground stress does not mean that the horizontal ground stress is greater than the vertical ground stress. In practice, people often understand that the horizontal stress is greater than the vertical stress as high stress. [0003] 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, th...

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Problems solved by technology

[0005] The purpose of the present invention is: in order to solve the existing supporting structure for the weak surrounding rock tunnel with high ground stress, there are still some deficiencies. When the inside of the weak surrounding rock changes, the supporting effect of the bolt will be greatly improved In severe cases, the support effect will be lost, resulting in the weakening of the stability of the entire tunnel support structure to a large extent, and when some weak surrounding rocks change, feedback cannot be given in time, and weak surrounding rocks are prone to occur. In view of the problem of large-scale variation, a support structure and construction method for tunnels with high ground stress and weak surrounding rocks are proposed

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