A kind of pre-grouting reinforcement method for the fault structure zone of the working face

Abstract

The invention relates to a pre-grouting reinforcement method for a fault structure zone on a working face, and belongs to the technical field of grouting support in coal mines. The advance pre-reinforcement operation is as follows: when the working face advances to 300-400m from the edge of the fault structure zone, under the static pressure condition of the working face, follow the trough up or down the working face along the advancing direction of the working face, and move toward the fault structure zone. Drilling, lowering, sealing and grouting of curtain grouting holes, shallow holes and deep holes in the area; then drilling, lowering and sealing of reserved holes; when the working face advances to the distance fault When the edge of the construction zone is 30-50m, under the dynamic pressure condition of the working face, grouting operation is performed on the reserved holes. The present invention achieves the purpose of proactively controlling faults in advance, with higher safety, and at the same time solves the passive and lagging construction problems of conventional methods, as well as the problem of the progress of forced stop production of faults in the treatment of faults, and realizes in a real sense It ensures continuous and efficient recovery during the working face crossing faults.

Description

technical field [0001] The invention belongs to the technical field of grouting support in coal mines, and in particular relates to an advanced grouting reinforcement technology method for broken coal rock mass in an underground fault structural belt. Background technique [0002] Faults are common geological structures in coal mine working faces. The original rock stress in the fault structure zone is complex and the integrity of the rock mass is poor. During the mining process, when the work faces an abnormal zone near the fault, the fault will be further activated. Affected by the broken surrounding rock environment and mining activation in the fault structure zone, it is easy to cause large-scale roof caving, coal wall siding and roof pressure frame accidents. When the working face passes through the fault, it is extremely difficult to maintain the roof and coal wall. The difficulty and low efficiency of the working face crossing the fault structural belt, and the four ...

AI Technical Summary

Problems solved by technology

The above methods have the following problems in the fault treatment process: 1. The distance of pillar support to control the roof is short, and the broken surrounding rock cannot be reinforced, and the construction effect and safety are poor

2. The cost of shallow hole chemical grouting reinforcement is high, and the grouting distance is short and the reinforcement range is small. It is mainly aimed at 5-10m shallow surrounding rocks, and cannot achieve the purpose of large-scale overall reinforcement of the fault fracture zone.

3. The above-mentioned methods are all partial and lagging passive methods for fault management, and cannot achieve advanced and pre-treatment of faults.

4. The above method requires to be carried out when the working face is stopped, which seriously affects the per unit yield of the working face and cannot guarantee the continuous advancement of the working face

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