Surface drilling pre-splitting blasting shallow burying method for room type goaf roof

Abstract

The invention discloses a surface drilling pre-splitting blasting shallow burying method for a room type goaf roof and belongs to a roof disaster preventing and controlling method for mining of a short distance coal bed below a shallowly-buried goaf. During long wall mining of the short distance coal bed below the shallowly-buried room type goaf, main roof large-area pressure coming happens easily, the yielding damage happens to a small-size coal column under the fracture load of a main roof, a large-size coal column has an elastic kernel and acts the concentrated stress on a lower coal bed work face hydraulic support, and collapse of a work face inner roof, pushing down of a support, hurricane impacting and other disasters are caused. According to the method, drilling pre-splitting blasting of the roof is performed on the ground, the problems that construction is difficult and the effective distance of drilling is short during forced caving of room penetrating type drilling pre-splitting blasting of the goaf are solved, roof large-area pressure coming, roof collapse, pushing down of the support and other disasters can be effectively prevented, and the method is also applicable tomining of lower coal beds of concentrated coal columns of a shallowly-buried long-wall goaf. The method is simple in implementation process, safe and efficient and has wide applicability.

Description

technical field [0001] The invention relates to a method for pre-splitting and blasting the roof of a shallow-buried goaf-type goaf by ground drilling, and is especially suitable for preventing and controlling roof disasters in short-distance coal seam longwall mining under the shallow-buried goaf. Background technique [0002] The coal seams of Shendong Coalfield are buried shallowly and have simple geological conditions. Before large-scale development, room or pillar mining is often used. This method supports the roof by leaving coal pillars. With the continuous development and utilization of coal resources, many mines have gradually exhausted the resources of the main coal mining layer of the first layer, and have gradually entered the second layer of main mining coal seam mining. Due to the small interlayer spacing, coal seam mining at a short distance has been formed, and some mines are the first There are concentrated coal pillars and residual coal pillars left in the ...

AI Technical Summary

Problems solved by technology

With the continuous development and utilization of coal resources, many mines have gradually exhausted the resources of the main coal mining layer of the first layer, and have gradually entered the second layer of main mining coal seam mining. Due to the small interlayer spacing, coal seam mining at a short distance has been formed, and some mines are the first There are concentrated coal pillars and residual coal pillars left in the goaf of the main coal seam, which caused many large-scale roof cutting accidents when the fully mechanized coal mining face of the lower seam passed through this area, and the support columns instantly shrank sharply, Severe dynamic pressure phenomena such as most of the brackets being crushed to death or damaged have seriously affected the safe and efficient production of the mine

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