水力扩孔扰动下穿层抽采钻孔串孔致因研究

doi:10.16265/j.cnki.issn1003-3033.2019.11.026

中国安全科学学报 ›› 2019, Vol. 29 ›› Issue (11): 164-170.doi: 10.16265/j.cnki.issn1003-3033.2019.11.026

水力扩孔扰动下穿层抽采钻孔串孔致因研究

王俊铭¹, 刘擎², 宝坤¹

1 陕西铁路工程职业技术学院管理工程系,陕西渭南 714000;
2 河南理工大学安全科学与工程学院,河南焦作 454003

收稿日期:2019-07-26 修回日期:2019-09-13 发布日期:2020-10-30
作者简介:王俊铭 (1991—),男,河南周口人,硕士,助教,主要从事瓦斯灾害防治、施工安全与应急管理等方面的研究。E-mail:1191836260@qq.com。
基金资助:
陕西铁路工程职业技术学院2018年第二批科研基金项目计划(KY2018-87)。

Study on causes of string hole in gas extraction cross seam under disturbance of hydraulic reaming

WANG Junming¹, LIU Qing², BAO Kun¹

1 Department of Management Engineering, Shaanxi Railway Institute, Weinan Shaanxi 714000, China;
2 School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454003, China

Received:2019-07-26 Revised:2019-09-13 Published:2020-10-30

摘要/Abstract

摘要： 为解决水力扩孔卸压过度问题,厘定水力扩孔合理冲煤量,进一步提高矿井瓦斯抽采效率,首先运用Hoek-Brown原则揭示和阐明水力扩孔后钻孔串孔发生原因;其次构建流-固耦合数学模型,借助COMSOL模拟软件分析扩孔卸压后煤体所受应力变化和渗透率变化情况;最后结合现场扩孔试验,考察不同扩煤量下钻孔串孔发生情况。结果表明:扩出煤量越大,扩孔孔洞周边煤体的径向位移形变量越大;孔洞附近区域内煤体卸压充分,透气性得到大幅改善,串孔发生率明显增大;现场试验与理论分析、模拟结果基本吻合,可为类似地质条件的矿井实施水力扩孔技术提供一定的参考依据。

关键词: 水力扩孔, 串孔, 径向位移, 合理冲煤量, 煤体透气性

Abstract: In order to improve gas drainage efficiency in coal mine by solving the problem of excessive pressure relief of hydraulic reaming and determining reasonable coal expansion amount, firstly, causes of string hole after reaming were revealed and clarified with Hoek-Brown principle. Secondly, fluid structure coupling mathematical model was constructed, and changes of stress and permeability of coal body under porous conditions after reaming and pressure relief were simulated and analyzed through COMSOL simulation software. Finally, occurrence of string-hole under different coal expanding amount was investigated based on field reaming tests. The results show that as coal-expanding quantity increases, radial displacement and deformation of coal near the hole will also increase. And probability of string-hole will grow sharply as permeability of coal around enlarged holes improves greatly when pressure relief is sufficient. It is found that field test results are basically consistent with that of theoretical analysis and simulation, which can provide some reference for implementation of hydraulic reaming technology in mines under similar geological conditions.

Key words: hydraulic reaming, string hole, radial displacement, reasonable coal expansion, coal permeability

中图分类号:

X948

王俊铭, 刘擎, 宝坤. 水力扩孔扰动下穿层抽采钻孔串孔致因研究[J]. 中国安全科学学报, 2019, 29(11): 164-170.

WANG Junming, LIU Qing, BAO Kun. Study on causes of string hole in gas extraction cross seam under disturbance of hydraulic reaming[J]. China Safety Science Journal, 2019, 29(11): 164-170.

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水力扩孔扰动下穿层抽采钻孔串孔致因研究

Study on causes of string hole in gas extraction cross seam under disturbance of hydraulic reaming

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