A method of excavation and support for roadway in short-distance coal seam

Abstract

The invention discloses a short-distance coal seam roadway excavating and supporting method. The method comprises steps as follows: 1, basic mechanical parameters of surrounding rock are determined; 2, reserved excavated volumes of two sides of a roadway are determined; 3, the roadway is excavated; 4, a roadway side supporting structure is determined and comprises roadway supporting units and grouted rock bolts which are arranged in a staggered manner, and the roadway supporting units comprise top plate supporting systems, bottom plate supporting systems and roadway side supporting systems; and the limit caving arch rise is determined; 5, the roadway supporting structure is determined; 6, roadway surrounding rock supporting construction is performed; 7, excavation of the next section and roadway surrounding rock supporting construction are performed; 8, the step 7 is repeated multiple times, and the short-distance coal seam roadway construction process is completed. The method is simple, reasonable in design, convenient to realize and good in use effect, the reserved excavated volumes of the two sides of the roadway are determined respectively according to surrounding rock deformation conditions of the short-distance lower coal seam roadway, and whole section supporting is performed on the roadway through combination of the grouted rock bolts with the roadway supporting units.

Description

technical field [0001] The invention belongs to the technical field of roadway construction, and in particular relates to an excavation and support method for short-distance coal seam roadways. 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 distance between coal seams is very close, and the coal seam has significant mutual influence during mining; generally refers to the coal seam whose distance between coal seams 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. The large amount of deformation of the side coal...

AI Technical Summary

Problems solved by technology

Practice shows that the basic theory of Platts' caving arch reflects the objective law of ground pressure to a certain extent, but it still has the following deficiencies: First, the horizontal stress σ h The impact on the caving arch, in fact, the lateral pressure coefficient λ has an influence on the shape and sagittal height of the roof caving arch; second, the simplification of the form of the two sides is improper, and the form of the rib has a greater impact on the sagittal height of the caving arch. Third, the shape of the roof caving arch is too simplified when the two sides are stable; fourth, the influence of the wedge-shaped failure of the two sides on the roof caving arch height is neglected. The arch sagittal height of this form is lower than the theoretical value

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