Negative-angle roof-cutting gob-side entry self-forming method

By using the negative-angle roof cutting method to form a self-contained tunnel along the goaf, and by constructing the drilling site ahead of time and drilling holes in an alternating manner, combined with grouting anchor cables and steel mesh support, the safety and stability problems caused by positive-angle roof cutting were solved, and efficient and safe tunnel construction was achieved.

CN122106591AActive Publication Date: 2026-05-29TAIYUAN UNIVERSITY OF TECHNOLOGY
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Patent Information

Application Number
CN202610594188.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-30
Publication Date
2026-05-29
Estimated Expiration
2046-04-30

AI Technical Summary

Technical Problem

In existing methods of cutting the roof to form a self-contained roadway and leaving a roadway along the goaf, cutting the roof at a positive angle can easily lead to the collapse of gangue into the mining roadway, endangering the safety of workers, and making it difficult to stabilize the support structure, thus affecting construction efficiency and safety.

Method used

The negative-angle top-cutting method is adopted to form a self-contained roadway along the goaf. By constructing a drilling site ahead of the mining area, interleaving anchor cables and top-cutting boreholes, and using grouting anchor cables and steel mesh to construct a roadway retaining structure, the direction of rock movement is controlled. Grouting is injected into the rock to reinforce the anchor cables, and the deformation of the steel mesh is monitored to adjust the position of the nuts to stabilize the support.

Benefits of technology

It improves construction efficiency and safety, ensures that the roadway width does not decrease, stabilizes the support structure, prevents gangue from impacting the mining roadway, and protects the safety of workers.

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Abstract

The invention belongs to the field of coal mine tunnel construction, and particularly relates to a negative-angle topping gob-side self-tunneling method. Comprising the following steps: excavating a drill site at the front part of a working face close to a right advanced stope of a mining roadway; anchor cable drill holes and top cutting drill holes are constructed in the drill site in a staggered mode in the trend, and grouting anchor cables are installed; carrying out negative-angle roof cutting on the basic roof and the immediate roof through roof cutting drill holes behind the stope, constructing a roadside waste rock blocking structure, grouting through a grouting anchor cable, and anchoring the grouting anchor cable on the roadside waste rock blocking structure; and deformation of the reinforcing mesh at the grouting anchor cables is monitored and adjusted through nuts. According to the method, the drill site with a certain width is constructed in advance, so that the construction position of the roadside gangue blocking structure does not influence the width of the gob-side entry retaining, and the integrity of a top plate can be ensured; the section with the lower portion deviating towards the goaf can be cut out through the negative-angle roof cutting drill hole, so that gangue formed by caving of the immediate roof moves towards the goaf and does not move into a mining roadway in a large amount, and construction safety in the mining roadway is guaranteed.
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