Excavation method of roadway in close distance coal seam based on roadside displacement analysis

Abstract

The invention discloses a close distance coal seam roadway excavation method based on roadway's side displacement analysis. The method comprises steps: 1, determining surrounding rock basic mechanical parameters; 2, determining reserved excavated volume of two sides of a roadway, including according to the determined surrounding rock basic mechanical parameters, combined with an inward displacement theoretical value of the pressing-side coal side of an overlaying rock and an inward displacement theoretical value of the pressing-side coal side of a coal pillar, determining reserved excavated volume of two sides of the roadway of a current construction segment; 3, excavating the roadway, including according to the determined reserved excavated volume of two sides of the roadway, excavating the current construction segment from back to front; 4, excavating a next segment; 5, repeating the step 4 for multiple times, until all excavation processes of the close distance coal seam roadway are completed. The method is simple in steps, rational in design, convenient in implementation, and good in use effect. The method respectively determines the reserved excavated volumes of two sides of the roadway according to surrounding rock deformation conditions of a close distance underlying seam roadway, and can solve a problem of intrusion roadway headroom after coal sides deform asymmetrically.

Description

technical field [0001] The invention belongs to the technical field of roadway construction, and in particular relates to a method for excavating short-distance coal seam roadways based on roadside displacement analysis. Background technique [0002] In recent years, with the gradual depletion of medium-thick coal seam resources, the mining of short-distance thin coal seam groups (also known as short-distance coal seam mining) has become one of the inevitable trends in the development of coal resources today. It is generally considered that the coal seams are closely spaced and have significant mutual influence during mining; generally refer to coal seams with a coal seam distance of less than 30m, that is, the thickness of the interlayer is less than 30m. Due to the small distance between coal seams in close coal seams, affected by the concentrated pressure formed by the coal pillars left behind after mining the upper coal seam, the surrounding rock deformation is severe. ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for excavating roadways in short-distance coal seams based on the analysis of roadside displacement in view of the deficiencies in the above-mentioned prior art. The surrounding rock deformation of the roadway in the lower coal seam is determined separately for the reserved excavation volume of the two sides of the roadway, which can effectively solve the problem that the asymmetric deformation of the coal side invades the clearance of the roadway and affects the normal use of the roadway, and avoids the problem of the roadway in the lower coal seam. rework work with low construction costs

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