Tunnel vertex angle surface wall rock reinforcement control method

Abstract

The invention discloses a tunnel vertex angle surface wall rock reinforcement control method. The method comprises the following steps of primarily determining the dimension of a rectangular section of a roadway, wherein influence factors of vertex angle wall rock surface formation are comprehensively considered, the reasonable surface form and the reasonable physical dimension at the vertex angleare determined, and finally the dimension of the section of the whole road way is determined; closely following a driving working face, and conducting high-strength high-pretightening-force bolt-mesh-cable supporting on a top plate and two sides; conducting high-strength high-pretightening-force cable-stayed grouting cable anchor supporting on angle surface wall rock, and through the cooperationof metal net covercoat and steel channel beams, forming a vertically and horizontally cooperative reinforced anchorage bearing structure; after the roadway is deformed and yielded, grouting lagging driving working face for reinforcement, so that the bearing capacity of the vertex angle wall rock is reinforced again, and the stability of the vertex angle wall rock is ensured. By means of the method, the problems can be effectively solved that the vertex angle stress concentration degree is high, anchor bolts and cables at the vertex angle are difficult to construct, deformation of the vertex angle wall rock is serious, and the anchor bolts and cables at the vertex angle are easy to fracture; the tunnel vertex angle wall rock control effect can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of roadway surrounding rock control, and in particular relates to a roadway top angle curved surface surrounding rock strengthening control method. Background technique [0002] After the excavation of the roadway, the surrounding rock stress is redistributed, and it is easy to form a large stress concentration at the top corner of the two sides of the roadway, especially in the roadway with rectangular or trapezoidal cross section. When the stress concentration of the surrounding rock at the top corner is greater than the strength of the surrounding rock at the top corner, it will cause deformation and failure of the surrounding rock at the top corner. Ultimately, roadway instability such as roof fall and sidewalls are caused, which seriously affects the safe production of coal mines. At present, bolts and cables are economical and effective support forms commonly used in coal mine roadways. However, for t...

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Problems solved by technology

[0003] The present invention provides a strengthening control method for the surrounding rock at the top corner of the roadway, which aims to effectively solve the problem of "high stress concentration at the top corner, high It is difficult to construct anchor rods and cables at the corners, the deformation of the surrounding rocks at the top corners is serious, and the anchor rods and cables at the top corners are easily broken", so as to effectively improve the control effect of the surrounding rocks at the top corners of the roadway

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