A method for prevention and control of old empty water under the condition of repeated mining under the condition of layering on thick coal seam damaged by small kiln

Abstract

The invention discloses a method for prevention and control of stagnant water under the condition of repeated recovery of layers damaged by small kilns on a thick coal seam. 1. Use the transient electromagnetic method and the high-density direct current method to detect the old empty water-rich anomaly area in front of the roadway; step 4, arrange conventional boreholes at the head of the roadway for drilling verification. ‑Excavation‑exploration cycle operation method to control the old empty water; Step 5, if water gushing occurs in the drilling verification process in Step 4; Step 6, If the amount of water drained by conventional drilling in Step 5 tends to be stable for a long time time processing. The present invention utilizes ground, downhole geophysical prospecting-conventional drilling-directional drilling to prevent and control old empty water, realizes advanced, efficient, safe, accurate, large drop, and long-distance interception and introduction of head-on old empty water, and effectively controls old empty water damage .

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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