A method for controlling bottom of roadway in short-distance coal seam

Abstract

The invention discloses a method for preventing and controlling a floor heave disease of a short-distance coal seam roadway. The method comprises the following steps of: 1, determining basic mechanical parameters of surrounding rocks; 2, determining excavated volumes reserved on two sides of the roadway; 3, excavating the roadway; 4, determining a roadway side support structure: the roadway support structure comprises a plurality of roadway support units and a plurality of grouting anchor rods, and the roadway side support units are staggered with the grouting anchor rods and respectively comprise a bottom plate support system and a roadway side support system; 5, constructing a roadway surrounding rock support; 6, excavating the next section and constructing the roadway surrounding rock support; and 7, repeating the step 6 until all the excavation of the short-distance coal seam roadway and the construction process of the roadway surrounding rock support are finished. The method disclosed by the invention is reasonable in design, convenient to realize and good in using effect; and the excavated volumes reserved on the two sides of the roadway are respectively determined according to the surrounding rock deformation condition of the short-distance lower coal seam roadway, and the grouting anchor rods and the roadway support units are matched to effectively support the roadway, so that the floor heave problem of the roadway can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of roadway construction, and in particular relates to a method for controlling the bottom of a roadway in a short-distance coal seam. 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 s...

AI Technical Summary

Problems solved by technology

However, due to the complexity of the stress conditions of coal mine roadways and the properties of surrounding rocks, there is still no unified understanding of the mechanism of subsidence, which leads to the determination of on-site subsidence control measures mostly by engineering analogy and construction personnel's experience, which has considerable Blindness and dependence on experience, the bottom-line governance effect is not ideal

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