Ground drilling and grouting treatment method for deep mining seam floor limestone water damage

Abstract

The invention discloses a ground drilling and grouting treatment method for deep mining seam floor limestone water damage. According to the method, a drilling vertical section formed by vertical drilling on the ground, a communication vertical fault drilled along the bedding after the drilling vertical section reaches the bedding, and a drilling bedding section of cracks of a fold axis portion are included, wherein the drilling bedding section is perpendicular to the maximum horizontal principal stress, and a limestone suspected water drainage point of a seam floor is filled through drilling and grouting. By the adoption of the technical scheme, the ground directional bedding is drilled and grouted till a fault and the fold axis portion are perpendicular to the maximum horizontal principal stress; as for a fracture-cavity type floor thin limestone grouting target stratum with both the transverse water guide difference and the longitudinal water guide difference being great, drilling is conducted along the vertical cracks so as to communicate more faults with the cracks of the fold axis portion to obtain a better diffusion radius, and the utilization rate of grouting slurry at high pressure is high; and the diffusion range of the slurry is wide, it is ensured that greater cracks can be tamped, the physical and mechanical property of a floor strata can be effectively changed after reinforcement, the strength and water isolating performance are improved, and water inrush is effectively prevented.

Description

technical field [0001] The invention belongs to the field of coal mining, and more specifically, the invention relates to a ground drilling and grouting control method for limestone water damage on the floor of a deep mining coal seam. Background technique [0002] In the process of coal mining, faults and their sides are often associated with the development of derived structural fissures, which are often in the same direction as the faults, forming structural fault zones. The water volume is large and stable; during the formation of folds under the action of horizontal stress, a series of secondary structures are associated and derived, mainly joints and cleavage structures. The tension on the outside is dominated by tension joints, the core is strongly squeezed, and axial cleavage develops. The coal seam floor has three ash dissolution cracks, fracture zones, fault water conduction zones, water-rich areas and special vertical water conduction zones in the Taiyuan Formatio...

AI Technical Summary

Problems solved by technology

[0002] In the process of coal mining, faults and their sides are often associated with and derived structural fissures, which are often in the same direction as the faults, forming structural fault zones. The water volume is large and stable; during the formation of folds under the action of horizontal stress, a series of secondary structures are associated and derived, mainly joints and cleavage structures. The tension on the outside is dominated by tension joints, the core is strongly squeezed, and axial cleavage is developed. The coal seam floor has three ash dissolution cracks, fracture zones, fault water conduction zones, water-rich areas, and special vertical water conduction zones in the Taiyuan Formation. Structural areas, especially vertical water-conducting faults and fold axial fissures are the focus of coal seam floor water hazards. This area has a direct hydraulic connection with the Austrian ash downward and receives a large amount of supply from the Austrian ash water. The upward high water pressure 1. Strong water content threatens the mining fracture floor of the coal seam. The existing technology adopts drilling and grouting in the coal mining roadway. This treatment method is directly carried out underground, and the drilling process may lead to water gushing accidents. , the downhole drilling grouting is atmospheric pressure grouting, the range of grout diffusion is limited, it is difficult to ensure that large cracks can be filled

Images