Coal face top plate water-rich gravel layer drilling and grouting method

A coal mining face, drilling and grouting technology, applied in mining equipment, earthwork drilling, directional drilling, etc., can solve problems such as complex construction technology, dense drilling, failure to meet expected requirements and progress goals, etc.

Inactive Publication Date: 2019-08-20
JIAOZUO COAL IND GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scholars at home and abroad have little research on the grouting reinforcement of the aquifer on the roof of the working face. The current grouting reinforcement methods often fail to meet the expected requirements and progress goals during construction. Generally, the drilling holes are shal

Method used

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  • Coal face top plate water-rich gravel layer drilling and grouting method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A drilling and grouting method for a water-rich gravel layer on the roof of a coal mining face, comprising the following steps:

[0020] (1) The depth of the drilling hole is 236.21m, and the final hole layer reaches the bedrock of the coal seam roof;

[0021] (2) Aperture structure: 0~181.64m aperture is Φ152mm, 181.64~236.21m aperture is Φ94mm;

[0022] (3) Pipe diameter structure: Φ127mm casing from 0 to 148.6m;

[0023] (4) Grouting construction: grouting started on June 16, 2018, and ended on September 24, 2018; drilling and grouting were carried out in three sequences: ① From June 16, 2018 to June 2018 The first grouting was done on 22nd June, the hole depth was 197.27m (gravel layer), the orifice pressure was 2.7Mpa, the flow rate was 235L / min at the end of grouting, and the duration exceeded 30min; ②June 27, 2018 to September 2, 2018 The second grouting per day, the hole depth is 236.21m (final hole), the orifice pressure is 3.1Mpa, the flow rate is 236L / min a...

Embodiment 2

[0026] A drilling and grouting method for a water-rich gravel layer on the roof of a coal mining face, comprising the following steps:

[0027] (1) The depth of the drilling hole is 221.64m, and the final hole layer reaches the bedrock of the coal seam roof;

[0028] (2) Aperture structure: 0~130m aperture is Φ152mm, 130~184.55m aperture is Φ94mm, 184.55~221.64m aperture is Φ75mm;

[0029] (3) Pipe diameter structure: 0~130m is Φ127mm casing; 130~184.55m is Φ108mm casing;

[0030] (4) Grouting construction: The grouting started on June 13, 2018, and ended on August 16, 2018; two sequential groutings were carried out in the drilling: ① From June 13, 2018 to July 2018 The first grouting on the 2nd, the hole depth was 184.5m (gravel layer), the orifice pressure was 2.0Mpa, and the flow rate was 235L / min at the end of the grouting; ②The second grouting from July 14, 2018 to August 16, 2018 , the hole depth is 221.64m (final hole), the orifice pressure is 2.7Mpa at the end of gro...

Embodiment 3

[0033] A drilling and grouting method for a water-rich gravel layer on the roof of a coal mining face, comprising the following steps:

[0034] (1) The depth of the drilling hole is 232.19m, and the final hole layer reaches the bedrock of the coal seam roof;

[0035] (2) Aperture structure: 0~149.52m aperture is Φ152mm, 149.52~232.19m aperture is Φ94mm;

[0036] (3) Diameter structure: Φ127mm casing from 0 to 141.62m;

[0037] (4) Grouting construction: grouting started on June 2, 2019, and ended on August 27, 2019; two sequences of drilling and grouting were carried out: ① From June 2, 2018 to June 2018 The first grouting was performed on 29th July, the hole depth was 212.04m (gravel layer), the orifice pressure was 3.2Mpa, the flow rate was 250L / min at the end of the grouting, and the duration exceeded 30min; ②July 1, 2018 to August 27, 2018 The second time of grouting per day, the hole depth is 232.19m (final hole), the orifice pressure is 4.2Mpa, the flow rate is 35L / min...

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Abstract

The invention discloses a coal face top plate water-rich gravel layer drilling and grouting method. According to the method, ground construction drilling is adopted, vertical downward drilling is constructed from the ground and goes deep to 2-3 m above the gravel layer, a casing pipe is arranged in a drilled hole, and a ring gap between the casing pipe and the drilled hole is filled with cement for fixing; and downward descending advancing type drilling-grouting-hole penetrating cyclic grouting is adopted from the terminal end of the casing pipe, the end hole depth is a bed rock layer, and after the end hole grouting pressure reaches the grouting finishing standard, the hole is sealed through pure cement paste, and grouting is finished. By means of the coal face top plate water-rich gravellayer drilling and grouting method, a coal bed work face top plate can be effectively strengthened, a gravel water containing layer is transformed into a water resisting layer or a weak water containing layer, and threats to coal bed work face recovery due to hole gap water are eliminated.

Description

technical field [0001] The invention relates to the technical field of drilling and grouting construction of a water-rich gravel layer on the roof of a coal mining face, in particular to a drilling and grouting method for a water-rich gravel layer on the roof of a coal mining face. Background technique [0002] The bedrock of the coal seam roof in some mining areas of the North China type coalfield is relatively thin, consisting of sand, sandy gravel, sandy pebble, semi-consolidated glutenite and marl, overlying Quaternary and Neogene thick unconsolidated pore water. Because the bedrock (thickness: 4-40m, average 9m) of the wellfield is weathered to varying degrees, with developed fissures and poor water-repellent performance, the existence of the roof caving fissure zone after mining in the working face will completely lose the water-repellent effect. If reasonable and effective maintenance measures are not taken, not only the recovery efficiency will be reduced, the initia...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21B7/04E21B33/13
CPCE21B7/04E21B33/13E21D11/10
Inventor 黄北海任小建陈浩刘咏钱家忠
Owner JIAOZUO COAL IND GRP CO LTD
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