Layered support method for rectangular coal roadway based on deep soft composite roof

Abstract

The invention discloses a layered supporting method based on a deep rectangular coal roadway with a tender composite roof. The layered supporting method is suitable for a coal face of a deep mine, and deformation of the rectangular mining roadway with the tender composite roof is controlled. Firstly, a borehole columnar section is used for judging the geological occurrence of the roadway roof, then a borehole observation instrument is used for detecting fracture development of the roadway roof in the coal mining process, and afterwards the effect of layered supporting is achieved through a short grouting anchor, a long grouting anchor and an anchor cable. By the adoption of the layered supporting method based on the deep rectangular coal roadway with the tender composite roof, according to the detected fracture development of the roof in the coal mining process, grouting supporting is carried out in time, grouting is carried out in time, the grout amount is more sufficient, and grouting cost is lowered.

Description

technical field [0001] The invention relates to a layered support method for a rectangular coal roadway based on a deep weak composite roof, which is suitable for deep mine coal mining face and controls the deformation of a rectangular mining roadway whose roof is weak and composite. Background technique [0002] The stability control technology of mining roadway in deep mine coal mining face has always been a key research direction in the field of mine pressure research. However, due to factors such as complex geological conditions and structural stress in coal mines, there have always been great difficulties in the research on surrounding rock control technology. Especially for the research on mining tunnels with weak composite roofs in deep wells, many scholars have carried out tireless explorations and proposed many valuable surrounding rock control schemes. The representative results are: tunnel step support method, the main principle of which is first The surrounding ...

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Problems solved by technology

[0003] However, the current research on surrounding rock control methods for coal roadways with deep weak composite roofs mainly has the following shortcomings: the grouting support cannot be carried out in time according to the needs, and the amount of grouting is often insufficient; the mining process of the coal mining face is not monitored The development of roof cracks in roadways with weak composite roofs

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