Grout-to-extinguish method of dual hard close-distance multiple seam gob areas

Abstract

The invention provides a grout-to-extinguish method of dual hard close-distance multiple seam gob areas, which resolves the problems of long grouting time, poor effect, astonishing waste of grout liquid materials and the like caused by the fact that no intensive study is performed on arrangement of grouting holes, parameter determining and the like through the existing grout-to- extinguish technology of coal mines, and simultaneously resolves the problem of difficult extinguishing of the dual hard close-distance multiple seam gob areas. The method includes the steps that confirming a specific position and range of a spontaneous ignition fire area; then calculating scattering radius of grout liquid to obtain largest separation distances of grouting drill holes and utilizing the range of the fire area and the separation distances of the drill holes to confirm the number of the drill holes in the fire area; confirming soil amount, water demand and total grout liquid amount required by the grouting through the range of the fire area and finally performing the grout-to-extinguish. The grouting is conducted from the border of the fire area to the center of the fire area in sequence. The grout-to-extinguish method of the dual hard close-distance multiple seam gob areas is simple and convenient to operate, small in risk, safe, reliable, quick in effect playing, good in effect and low in cost, and has higher actual popularization and application value.

Description

technical field [0001] The invention relates to a fire extinguishing method in a mining area, in particular to a goaf grouting fire extinguishing method under the conditions of "two hard" (hard roof and hard coal seam), short distance and multiple coal seams. Background technique [0002] The coal industry is the basic industry for national economic and social development, and the sustainable development of the coal industry is directly related to the realization of the goal of building a well-off society in an all-round way and national energy security. my country's coal mine safety production has many sources of danger and the situation of severe disasters is very severe. Compared with foreign countries, the death rate per million tons of coal mines is very different. Statistics show that among the 657 key coal mines across the country, 54.9% of the coal mines have a tendency to spontaneously ignite coal seams, and more than 50% of mines have been verified to have an ignit...

AI Technical Summary

Problems solved by technology

There is no in-depth study on the arrangement of grouting holes and the determination of parameters. Therefore, in the process of grouting, the arrangement of grouting holes, the ratio of grout and the determination of related parameters are often unreasonable, resulting in long grouting time, poor effect and grout materials. Surprising waste and other situations seriously affect the safe production of coal mines

Images