A kind of high ground stress weak surrounding rock tunnel support structure and construction method thereof

Abstract

The invention discloses a high ground stress weak surrounding rock tunnel support structure and a construction method thereof, belonging to the technical field of traffic engineering facilities. A threaded bolt is embedded in the interior, and a surrounding rock sealing layer is poured on the inner arc surface of the weak surrounding rock corresponding to the position of the threaded bolt, and the threaded bolt is located in the sealing layer buffer opening opened on the surface of the surrounding rock sealing layer. In the present invention, through the designed mutual cooperation among the surrounding rock sealing layer, water barrier, buffer pad, inner support body, torsion spring, threaded bolt, first nut and second nut, the weak surrounding rock can be avoided. The mutation expands rapidly, and with the cooperation of the surrounding rock sealing layer and the water barrier layer, the surrounding rock sealing layer has the ability of windproof sealing and stability to the weak surrounding rock, and the water barrier layer can prevent the water in the weak surrounding rock from seeping and Erosion of tunnels.

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 geological concept that refers to the ratio of rock compressive strength to in-situ stress. High in-situ stress does not mean that the horizontal in-situ stress is greater than the vertical in-situ stress. In practice, people often understand that the horizontal in-situ stress is greater than the vertical in-situ stress as high in-situ stress. [0003] Weak surrounding rock generally refers to the surrounding rock with weak rock quality, low bearing capacity, developed joints and fissures, and broken structure. The rock mass structure surface is weak and easy to collapse; the characteristics of the weak surrounding rock determine its deformation characteristics in the process of ...

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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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