Prevention and treatment method for goaf water under condition of repeated mining of thick seam upper slices destructed by minitype coal mines

Abstract

The invention discloses a prevention and treatment method for goaf water under condition of repeated mining of thick seam upper slices destructed by minitype coal mines. The method comprises the following steps: step 1, determining a target area of directional drilling; step 2, constructing a drilling field; step 3, detecting the goaf water-rich anomaly area of the roadway heading face by a transient electromagnetic method and a high-density direct current method; step 4, arranging conventional drilling holes in the roadway heading face for drilling verification, allowing roadway tunneling incase of no anomaly in drilling verification, and treating the goaf water by circulation of water exploitation-tunneling-water exploitation; step 5, performing treatment in case of gushing water in drilling in the process of drilling verification in step 4; step 6, performing treatment if the drainage volume of the conventional drilling holes of the heading face in step 5 tends to be stable for a long time. The goaf water is prevented and treated by combination of ground and downhole geophysical prospection-conventional drilling-directional drilling; advanced, efficient, safe, accurate, large drop and long-distance cut-off and diversion of the goaf water is achieved; and disaster caused by the goaf water is effectively treated.

Description

technical field [0001] The invention relates to the technical field of underground water prevention and control in coal mines, in particular to a method for preventing and controlling stagnant water under the condition of repeated mining where layers on thick coal seams are damaged by small kilns. Background technique [0002] my country has a long history of coal mining. Due to the backward mining technology of small kilns in the early stage, disorderly mining led to poor control of the location of the excavation project, complex water accumulation in the old space, and many sudden water disasters, especially in Shanxi, Sichuan, and Guizhou. serious. In recent years, Laokong water has become the most serious type of water damage in mines due to its static reserves, fierce onslaught, strong disastrousity, concentrated water volume, and toxic and harmful gases. It has become the most serious type of water damage in mines. The serious threat of old empty water damage, preventi...

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Problems solved by technology

[0005] The above research shows that the prevention and control of Laokongshui has achieved good results, mainly focusing on the comprehensive exploration of Laokongshui by using various geophysical prospecting methods. However, due to the multi-solution nature of geophysical prospecting results, there are still uncertainties in the accuracy of Laokongshui exploration or use geophysical prospecting to roughly determine the location of the old empty water, the amount of accumulated water, etc., and use conventional drilling to drain the old empty water. However, the conventional drilling has a short exploration distance and can only be explored during the roadway excavation process, and the exploration trajectory cannot There are also successful cases of using geophysical prospecting technology to roughly determine the water accumulation in the old void, and using directional drilling to dredge the old empty water. Most of them use cable drilling tools to design "casing section-creep "Section-stabilizing section" 3-segment drilling structure, and the upper coal seam is dredged from the lower coal seam. When this kind of drilling tool is drilling in the old empty area, it is very easy to cause a drill stuck accident, and the use of directional drilling and single geophysical prospecting As a result, the prevention and control of old empty water cannot ensure that the old empty water is drained cleanly and thoroughly; occasionally, a water partition wall is set up to prevent old empty water.

There are few prevention and control methods for old empty water in the same thick coal seam under the condition of repeated mining caused by small kiln damage. It has always been a technical problem in mine water prevention and control

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