Combined prevention and control method of combined dynamic disasters in coal seam hydraulic slot mining with liquid injection and extraction

Abstract

A method for preventing and controlling composite dynamic disasters by integrating liquid injection and drainage in hydraulic slotted mining of coal seams, comprising the following steps: determining the positions of liquid injection holes and gas drainage holes in the coal seam, and adopting a row of liquid injection holes and a row of gas drainage holes Set alternately, determine the distance between the liquid injection holes, the gas drainage holes, and the distance between the liquid injection holes and the gas drainage holes, and drill the positions of the liquid injection holes and gas drainage holes determined above. Slits are drilled in each drilled liquid injection hole and gas drainage hole, and the liquid injection pipeline is connected with the liquid injection hole, and the drainage pipeline is connected with the drainage hole; the liquid injection operation and the drainage operation are performed on the coal seam at the same time. ; After the end, use a hole sealer to seal the hole. The wetting agent combination used in conjunction with a coal seam hydraulic slot mining liquid injection and drainage integrated method for preventing and controlling compound dynamic disasters is composed of the following raw materials in percentage by weight: chelating agent 0.5%-5%, wetting agent 0.5%-5 %, water 90%‑99%.

Description

technical field [0001] The invention belongs to the field of coal seam liquid injection, and in particular relates to a method for preventing and controlling compound dynamic disasters by integrating liquid injection and extraction in coal seam hydraulic slot mining and a matching wetting agent combination. Background technique [0002] Coal mine safety is the guarantee of coal production. The prevention and control of coal mine dynamic disasters such as rock burst and coal and gas outburst are important links in coal mine safety work. Coal seam liquid injection is one of the most active and effective measures. Coal mines have been more and more widely used. [0003] Coal seam liquid injection is to drill holes in the coal seam, and then press water into the coal seam, so that the water can be evenly distributed in a large number of fine cracks and pores in the coal seam, so that the coal seam is moistened, softening the coal body, displacing gas, and realizing prevention an...

AI Technical Summary

Problems solved by technology

When gas drainage is performed in deep coal seams, the extracted gas content is small, but there will be a large amount of gas gushing out during the coal mining process; when the coal seam is injected with liquid, the effect of liquid injection is extremely poor, and often the amount of liquid injected is extremely low or even cannot be injected. Therefore, the current technology and parameters of coal seam liquid injection to prevent and control coal mine dynamic disasters can no longer meet the requirements of deep low-permeability and high-gas coal seam prevention and control of combined dynamic disasters.

Images