|本期目录/Table of Contents|

[1]刘志伟.低渗煤层高压水射流割缝强化瓦斯抽采技术研究[J].中国安全生产科学技术,2019,15(7):75-80.[doi:10.11731/j.issn.1673-193x.2019.07.012]
　LIU Zhiwei.Study on high pressure water jet slotting technology for enhancing gas drainage in low permeability coal seam[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2019,15(7):75-80.[doi:10.11731/j.issn.1673-193x.2019.07.012]
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低渗煤层高压水射流割缝强化瓦斯抽采技术研究
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
15
期数:
2019年7期
页码:
75-80
栏目:
职业安全卫生管理与技术
出版日期:
2019-07-31

文章信息/Info

Title:
Study on high pressure water jet slotting technology for enhancing gas drainage in low permeability coal seam
文章编号:
1673-193X(2019)-07-0075-06
作者:
刘志伟1; 2
(1.瓦斯灾害监控与应急技术国家重点实验室，重庆 400037；
2.中煤科工集团重庆研究院有限公司，重庆 400037)
Author(s):
LIU Zhiwei1; 2
(1.State Key Laboratory for Gas Disaster Monitoring and Emergency Technology, Chongqing 400037, China;
2.CCTEG Chongqing Research Institute, Chongqing 400037, China)
关键词:
高压水射流割缝;  FLAC3D数值模拟; 塑性破坏特征; 应力演化规律
Keywords:
high pressure water jet slotting;  FLAC3D numerical simulation;  plastic failure characteristic;  stress evolution laws
分类号:
X936;TD713
DOI:
10.11731/j.issn.1673-193x.2019.07.012
文献标志码:
A
摘要:
为了解决低渗高突煤层瓦斯治理工程量大、效率低难题，提出在煤层中利用高压水射流切割缝槽依靠煤岩自身重力自动卸压强化瓦斯抽采技术。为了确定超高压水射流割缝工艺参数，采用FLAC3D数值模拟方法分析了不同缝槽间距、宽度条件下缝槽周围煤体塑性破坏特征和应力演化规律，得出高压水射流割缝合理缝槽间距为3 m，合理缝槽宽度为100 mm，现场实践表明：高压水射流割缝增大了煤层暴露面积、煤体扰动体积，高负压抽采支管瓦斯流量和浓度显著提升，瓦斯抽采纯量在0.7~1.1 m3/min范围内波动，瓦斯浓度在50%以上，对该矿其他工作面瓦斯治理具有一定借鉴意义。
Abstract:
In order to solve the problems of large engineering quantity and low efficiency of gas control in the low permeability and high outburst coal seam, it was proposed to use the high pressure water jet to cut slots in the coal seam, thus enhance the gas extraction by automatically relieving pressure depending on their own gravity of coal and rock. In order to determine the technological parameters of ultrahigh pressure water jet slotting, the plastic failure characteristics and stress evolution laws of coal around the slot under different slot spacing and width conditions were analyzed by using the FLAC3D numerical simulation method. It was concluded that the reasonable slot spacing of ultrahigh pressure water jet slotting was 3 m, and the reasonable slot width was 100 mm. The field practice showed that the ultrahigh pressure water jet slotting increased the exposed area of coal seam and coal disturbance volume, and the gas flow and concentration of high negative pressure extraction branch pipe increased significantly. The pure quantity of gas extraction fluctuated in the range of 0.7-1.1 m3/min, and the gas concentration was more than 50%. It has a certain reference significance for gas control in other working faces of the mine.

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备注/Memo

备注/Memo:
收稿日期： 2019-04-06；数字出版日期： 2019-07-30
* 基金项目： 国家重点研发计划项目（2017YFC0804208）
作者简介： 刘志伟，硕士，副研究员，主要研究方向为矿井瓦斯灾害预测与防治。
更新日期/Last Update: 2019-08-07