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Construction method of a concealed water-cutting curtain for deep-buried loose confined aquifers

A technology for a confined aquifer and a construction method, which is applied in the directions of drainage, earth-moving drilling, vertical well equipment, etc., can solve the problems of low interception rate, blindness of grouting pressure and grouting amount control, immature grouting technology, etc. To achieve the effect of reducing porosity, good interception and impermeability

Active Publication Date: 2022-04-08
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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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

Method used

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  • Construction method of a concealed water-cutting curtain for deep-buried loose confined aquifers
  • Construction method of a concealed water-cutting curtain for deep-buried loose confined aquifers
  • Construction method of a concealed water-cutting curtain for deep-buried loose confined aquifers

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Embodiment Construction

[0052] The present invention will be described in detail below with reference to the drawings and embodiments.

[0053] Project overview: A coal mine in Suzhou City, Anhui Province mainly mines Shanxi Formation 8 coal 11. The mining area 88 on the north side of the minefield is at the oblique rise end of Sudong sync. Covering the strong water-rich aquifer of Ordovician limestone, Sihan has obvious hydraulic connection with Ordovician limestone aquifer 13. The Ordovician limestone has a large hydrodynamic reserve, which directly supplies Sihan, and Sihan is underpressured. 18 million tons of coal. In the process of mining and production, affected by human disturbance, the ash water that contains water and participates in recharge can enter the mine through various aqueducts and cause water damage. For example, on January 30, 2015, 866 -1 A water and sand infestation accident occurred in the working face with 7 deaths, causing heavy losses. The four water cuts have seriously th...

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Abstract

The invention belongs to the technical field of mine curtain interception and water blocking engineering, in particular to a construction method of a concealed water interception curtain in a deeply buried loose pressurized aquifer. In order to overcome 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 existing in the existing deep-buried loose layer closure curtain construction technology. The steps of the technical solution of the present invention are: 1) comprehensively considering the topography, the supply water source of the loose layer, the runoff direction and the spatial relationship of the mine excavation system, and determining the position of the curtain line; The grouting boreholes are arranged in plum blossom pile type, and the inspection boreholes are arranged between the inner and outer rows of grouting boreholes. The boreholes are vertical holes; 3) Drilling and grouting; Carry out pressure water test to the original hole depth, 5) Repeat steps 3)-(2) and step 4) until the designed final hole depth is reached, and the final hole is 5-10m into the complete bedrock; 6) Construction inspection hole.

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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21D11/38E21F16/00
CPCE21D11/10E21D11/38E21F16/00
Inventor 郑士田石志远邢茂林郑士伟王宇航王琦吴燕军童仁剑李杨
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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