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Coal road stripe region burst-preventing method

A coal roadway and regional technology, which is applied in the field of outburst reduction in a single coal seam coal roadway strip area, can solve the problems of uncontrollable damage range and direction, complicated procedures and processes, and needs to be investigated and perfected, so as to improve the effect of regional outburst prevention , shorten the construction time and increase the air permeability of the coal seam

Inactive Publication Date: 2015-01-28
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, hydraulic fracturing causes pressure relief and stress concentration at the same time in the coal seam, the damage range and direction are uncontrollable, and it is easy to crush the floor roadway, and its regional outburst prevention effect needs to be investigated and improved; Strengthen the pressure relief and anti-reflection by increasing the diameter of the coal hole section, and improve the pre-pumping effect by charging blasting and anti-reflection in the part of the coal hole section of the part-through drilling. The process and process itself are more complicated, and the safety and reliability need to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The floor rock roadway 6 is located directly below the coal seam roadway 3 to be excavated in the inclined coal seam, with an upper distance of 8m from the coal seam; during the excavation process of the floor rock roadway, when faults are encountered, necessary outburst prevention technical measures shall be taken to appropriately increase the upper distance of the floor rock roadway 6 Coal seam 1 to ensure the safety of excavation; floor rock roadway 6 is excavated at least 135m ahead of the coal roadway to ensure sufficient extraction time; floor rock roadway 6 is generally not less than 3 months for gas extraction through layer-crossing drilling; The floor rock roadway 6 pressure relief gas drainage project includes excavation of the floor rock roadway 6, construction drilling, sealing, and installation of the main pipeline. Arranged in a fan shape, the distance between the drill holes in the middle is large, and the distance between the drill holes on both sides is ...

Embodiment 2

[0036] Floor rock roadway 6 is used to be located directly below coal roadway 3 to be excavated in the inclined coal seam, and the upper distance is 10m from the coal seam; bottom rock roadway 6 is excavated at least 150m ahead of the coal roadway to ensure sufficient extraction time; Drainage takes 3.5 months; the boreholes are arranged in a fan shape in the roadway, the distance between the holes in the middle is large, and the distance between the holes on both sides is small; the diameter of the borehole is 90mm, and the hole is opened on the roof of the roadway, and the final hole penetrates into the roof of the coal seam 0.5 m, the sealing length of the drainage drilling above the floor rock roadway to the coal seam, the sealing length of the drainage drilling on both sides is 6m, the negative pressure of the drainage drilling hole is 15kpa, and the gas drainage is carried out through the drainage system after sealing.

Embodiment 3

[0038] A kind of outburst prevention method of a coal roadway strip area of ​​the present invention has been successfully practiced in deep mines such as Shangyi, Jianxin, Pinghu and Qujiang in Fengcheng, Jiangxi Province, when excavating a single seriously outburst and inclined medium-thick coal seam. Mining inclined single severe overhang B 4 Coal seam, mining depth 600~1100m, coal seam dip angle 10~14°, thickness 2.2~3.5m, coal seam hardness coefficient f=0.3~0.8, gas pressure 3.0~9.2MPa, gas content 13.5~25.3m 3 / t. The lithology of the floor is fine sandstone or medium-grained sandstone, and the design section of the rock roadway is 7.84-12.6m 2 , and overlap with the coal roadway to be excavated, and the distance between the roadway top and the coal seam is 8-10m. According to the test and investigation, during the excavation of the rock roadway, the pressure relief gas discharge is at 14.4-196.6m 3 / min; the surrounding rock of the floor rock roadway has partition cr...

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Abstract

The invention discloses a coal road stripe region burst-preventing method which comprises the following steps: enabling a to-be-dug coal road to be directly positioned in a pressure relieving region of a pre-digging bottom plate rock gangway and performing stripe-drilling on drawing-out coal bed gas, namely, pre-digging the bottom plate rock gangway along a trend just below the to-be-dug coal road coal bed, performing pressure relief on the to-be-dug coal road on the bottom rock gangway, and performing gas drawing-out on the upper edge and the lower edge of the to-be-dug coal road by adopting stripe-drilling. According to the coal road stripe region burst-preventing method, the purposes of relieving pressure of the to-be-dug coal road stripe coal bed, increasing the breathability, and improving the gas extraction effect can be realized. The coal road stripe region burst-preventing method has the characteristics of improving the safety and reliability of stripe-drilling construction, reducing the burst-preventing project, shortening the construction time, and improving the burst-preventing effect of the coal road stripe region.

Description

technical field [0001] The invention relates to a method for extracting gas from a coal seam, in particular to a method for eliminating outbursts in a strip area of ​​a single coal seam coal roadway under different dip angles, buried depths, lithology and structural conditions of coal strata. Background technique [0002] my country is the main coal-producing country in the world, and it is also one of the countries with the most serious coal and gas outbursts in the world. 95% of its coal production comes from underground mining, while high-gas and outburst mine coal production accounts for more than 30%. As coal mining in my country extends to the deep at a rate of 10-40m per year, with the increase of mining depth, dynamic disasters such as outbursts and rock bursts increase significantly; The mechanism is more complex, and the combination of outburst and rockburst dynamic disasters is prominent, and preventing outburst is still a worldwide problem. [0003] High gas outb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00
CPCE21F7/00
Inventor 胡千庭孟贤正胡圣辉舒桂德张永将甘宗滔程国建曹建军陈国红刘军王中华袁本庆李成成
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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