Construction method of concealed water interception curtain of deep-buried loose confined aquifer

Abstract

The invention belongs to the technical field of mine curtain water interception and water plugging engineering, and particularly relates to a construction method of a concealed water interception curtain of a deep-buried loose confined aquifer. The construction method aims to solve the problems that in an existing construction technology of a deep-buried loose layer water interception curtain, the grouting process is immature, the grouting pressure and the grouting amount are controlled blindly, the curtain lacks integrity, and the water interception rate is low. According to the technical scheme, the construction method comprises the steps that 1) the spatial relation among the terrain, a loose layer supply water source, the runoff direction and a mine excavation system is comprehensively considered, and the position of a curtain line is determined; 2) two rows of grouting drill holes are formed along the curtain line at equal intervals, the inner row of grouting drill holes and the outer row of grouting drill holes are arranged in a quincuncial pile mode, inspection drill holes are formed between the inner row of grouting drill holes and the outer row of grouting drill holes, and the drill holes are vertical holes; 3) drilling and grouting are conducted; 4) after grouting of each grouting section is completed, the holes are swept to the original hole depth, and a water pressure test is conducted; and 5) the step 3), the step 2) and the step 4) are repeated till the designed final hole depth is reached, and the drill holes enter a final hole 5-10 m away from a complete bed rock; and (6) the inspection holes are constructed.

Description

technical field [0001] The invention belongs to the technical field of mine curtain interception and water blocking engineering, in particular to a method for constructing a concealed water interception curtain in a deeply buried loose pressurized aquifer. Background technique [0002] The upper part of the coal seam is generally covered with unconsolidated and hardened diagenetic loose sediments (loose layers) composed of loose particles such as soil, sand, gravel, and pebble layers, and there is confined groundwater in between. When coal is mined in the near-loose layer, when the roof mining damages the cracks and spreads to the loose aquifer, the groundwater will carry loose sand and gravel into the mine through the mining cracks, and accidents such as roof water inrush and sand damage will occur, seriously affecting mine safety and production. [0003] In order to solve the above-mentioned problems, the prior art mainly adopts methods of draining water from the roof, set...

AI Technical Summary

Problems solved by technology

[0005] The present invention overcomes the problems of immature grouting process, blindness in the control of grouting pressure and grouting volume, lack of integrity of the curtain, and low closure rate in existing deep-buried loose layer closure curtain construction technology, and provides a deep-buried Construction Method of Concealed Water-cutting Curtain for Loose Confined Aquifer

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