Deep fractured surrounding rock composite grouting reinforcement method

Abstract

The invention discloses a deep fractured surrounding rock composite grouting reinforcement method which comprises the following steps: S1, partitioning a deep fractured surrounding rock, and dividing the deep fractured surrounding rock into a completely fractured region, a fractured reduction region, a fractured compression region and a protolith-like region according to the degree of fracture; S2, based on the zoning result of the deep broken surrounding rock, performing slurry permeability characteristic zoning on each broken surrounding rock zone to obtain a slurry high-permeability zone, a slurry medium-permeability zone and a slurry low-permeability zone; S3, performing a grouting test on the construction site, and determining the grouting pressure and the drilling row pitch of each permeability characteristic subarea; S4, selecting a corresponding grouting material for each grout permeability characteristic subareasaccording to the fracture development degree; and S5, conducting drilling and grouting operation on the deep fractured surrounding rock subareas, and injecting each grouting material into the corresponding grout permeability characteristic subareas. According to the method, surrounding rocks form a net-shaped structure with interlaced slurry veins through multiple grouting modes and grouting materials, and the mechanical property of a consolidated body is greatly improved.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a composite grouting reinforcement method for deep subregional fractured surrounding rocks. Background technique [0002] Due to the large-scale mining of shallow coal resources, many coal mines in my country are gradually turning to develop deep coal resources. During the excavation of surrounding rocks in deep roadways, various complex geological rock masses will inevitably be encountered, such as structural fracture zones, faults, weak rock formations, etc. . At the same time, the geomechanical environment of "three highs and one disturbance" in the process of deep mining aggravates the difficulty of surrounding rock control. The surrounding rocks of deep roadways are characterized by severe deformation, large deformation and long deformation time. The roadway needs to be repaired many times to meet the requirements. Safe use requirements. [0003] Grouting, as one of the...

AI Technical Summary

Problems solved by technology

Due to the harsher geomechanical environment of surrounding rocks in deep roadways, it is difficult to ensure the control effect of surrounding rocks by using the traditional single grouting method, resulting in frequent cases of roadway surrounding rock collapse and roof fall after grouting reinforcement

The essence of collapse and roof fall still occurs after grouting reinforcement of the roadway surrounding rock is that the traditional single grouting method cannot meet the requirements of reliable performance indicators of deep complex geological rock mass

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