Method for plugging confined water in underground coal mine sandstone crack

Abstract

The invention discloses a method for plugging confined water in an underground coal mine sandstone crack. The method comprises the steps of selecting the transient electromagnetic technology to detect enriched water pressure of a lane in advance; secondly, forcibly plugging a main water outlet point of a receiving head by a two-fluid-grouting method so as to prevent grouting fluid from running out of the water outlet point in the next grouting; thirdly, constructing an enriched water area explored by early-stage transient electromagnetism by using a drilling machine, grouting and drilling a deep part, grouting from the inside to the outside and from the shallow to the deep in a three-dimensional manner until the cracks in the enriched water area are fully injected; and fourthly, constructing the lane after the grouting, arranging a chamber at the position without affecting the normal construction after the lane passes through the enriched water area safely, and constructing a water discharging hole in the chamber so as to discharge water. According to the method, the water discharge cost is saved for a coal mine, and the valuable experience is provided for the prevention and control of the confined water in the sandstone crack of a top plate, so that the method has a broader social promotion prospect.

Description

technical field [0001] The invention relates to underground water control technology in coal mines. Background technique [0002] The basement of the Carboniferous Permian coalfield in North my country in China is the Middle Ordovician carbonate rock, and the coal-measure strata are mainly the fluvial facies in the lower part of the Cenozoic loose deposits and the alluvial-diluvial sandy gravel aquifer in the foothills. Water hazards caused by large water volume, high water pressure, and large static storage of water sources. [0003] For example, a coal mine in Shandong Province is located in the northern part of the Yellow River. The second mining area and the second mining area went up the mountain and began to produce water on May 29, 2008. The maximum water output at the outlet point at the left shoulder of the head is 150m3 / h, and the maximum water output of the entire face is 224m3 / h , the maximum water pressure reached 3MPa, which made the roadway construction imposs...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing water prevention and control technology that the effect is not obvious, the construction cost is large, the construction period is long, and the actual needs cannot be met, and to provide a trinity water prevention and control technology of exploration, blocking and injection + dredging comprehensive water prevention and control technology. Implemented sandstone fissure confined water sealing method