Method for controlling deformation of coal seam floor rock stratum through underground grouting slurry filling sleeve

Abstract

The invention discloses a method for controlling deformation of a coal seam floor rock stratum through an underground grouting slurry filling sleeve, and the method gives full play to the mechanical property of the slurry filling sleeve, and based on the rock stratum deformation resistance caused by non-uniform deformation of the slurry filling sleeve in the axial direction, the deformation of a to-be-reinforced space is controlled by determining the geologic characteristics and range of the to-be-reinforced space. The stable fixed end of the surrounding rock is determined, the fixed end for the grout filling sleeve to play a role is provided according to the space stress characteristics of the grout filling sleeve, and the application range is as follows: the coal seam floor rock stratum range: goaf lower part, floor roadway engineering, coal seam floor fault structure and the like. The method can effectively meet the urgent safety requirement of coal mine operation, can control large deformation of a bottom plate, roadway floor heaving or fault structure treatment and the like, is not only suitable for the situations that confined water threatens a mine, a working face bottom plate is seriously deformed and a roadway bottom plate is seriously deformed, but also suitable for the situation of fault reinforcement, and has a wide application prospect. And a theoretical basis can be provided for bottom plate grouting reinforcement and water prevention and control work of similar mines.

Description

technical field [0001] The invention belongs to the technical field of the coal industry, relates to a new method for controlling the expansion of cracks by controlling the deformation of the rock layer, and in particular relates to a method for strengthening the rock layer of the coal mine floor based on the uneven deformation of the slurry filling casing. Background technique [0002] Usually, grouting reinforcement is an important means of water control in large water mining areas, such as Feicheng, Jiaozuo, Hanxing, Fengfeng and Huaibei, etc., all use grouting reinforcement technology to solve the problem of bottom water control. During the grouting process, the casing is used as a grouting tool to assist the grouting and timely plug the water in the drilling construction. After the grouting is completed, the high pressure seals the hole, the casing is filled with the slurry, and the solidified slurry and the casing become an integral part of the rock mass of the floor, ...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method for downhole grouting slurry filling casing to control the deformation of the coal seam floor, the method is based on the bending stiffness of the slurry filling casing, On the basis of determining the damage depth of the floor, select the number and length of the casing, arrange the casing according to the design angle, and use the casing combination to control the deformation of the floor rock layer during coal mining, which solves the problem of floor deformation during coal mining or tunneling

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