Wavy directional drilling and grouting reconstruction method for rock stratum with complex fracture structure

By using wavy directional drilling and grouting modification methods, the problems of large drilling volume and many ineffective drilling steps were solved, an effective water-blocking layer was formed, and the grouting effect was improved. This method is suitable for mine water control and groundwater resource protection in complex fractured rock formations.

CN117328872BActive Publication Date: 2026-08-04XIAN RES INST OF CHINA COAL TECH & ENG GRP CORP
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Patent Information

Application Number
CN202311211394.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-09-19
Publication Date
2026-08-04
Estimated Expiration
2043-09-19

AI Technical Summary

Technical Problem

In existing technologies, the large amount of drilling work and the large amount of ineffective drilling footage lead to poor grouting results. In particular, the probability of drilling to expose fractures in complex fractured rock formations is low, which cannot effectively improve the water-blocking capacity of the rock formations.

Method used

The method of wave-shaped directional drilling and grouting modification was adopted. By analyzing the hydrogeological structure, permeable skylight areas were identified and wave-shaped directional boreholes were designed. Drilling and grouting modification were carried out along the groutable skylight areas to form a staggered directional borehole layout pattern. Near-horizontal fractures were exposed multiple times, which improved drilling efficiency and grouting effect.

Benefits of technology

It significantly reduces drilling workload, improves the reliability of grouting modification, forms an effective water-blocking layer, reduces ineffective drilling, protects groundwater resources, and is suitable for large-scale industrial use.

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Abstract

This invention discloses a method for wavy directional drilling and grouting modification of complex fractured rock strata. First, by analyzing the overburden structure of the coal seam roof, permeable windows in the key water-resistant layer are identified. Second, by analyzing the overburden structure of the coal seam roof, the spatial structure of the weathered and normal bedrock layers in the window area is identified. Third, the height of the caving zone and fracture zone formed by coal seam mining in the permeable window area is predicted. Fourth, the relationship between the mining-induced water-conducting fractures and the exposed weathered bedrock layer in the window area is analyzed to identify areas where grouting can be used to treat the permeable window. Fifth, based on the identified areas where grouting can be used, wavy directional boreholes are designed on the surface in the weathered bedrock layer of the window area. Sixth, the wavy directional boreholes are drilled and grouting is carried out to create an artificially reconstructed water-blocking layer in the permeable window area, thereby reducing water inflow from the roof of the coal mining face and protecting groundwater resources.
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