基于蠕变效应的穿层钻孔封孔参数优化与试验研究

doi:10.16265/j.cnki.issn 1003-3033.2021.07.014

中国安全科学学报 ›› 2021, Vol. 31 ›› Issue (7): 97-104.doi: 10.16265/j.cnki.issn 1003-3033.2021.07.014

基于蠕变效应的穿层钻孔封孔参数优化与试验研究

张钧祥^1,2,3 讲师, 刘彦伟³ 教授, 任培良⁴ 高级工程师, 韩红凯³ 讲师, 左伟芹³ 副教授

1 中原工学院能源与环境学院,河南郑州 451191;
2 河南理工大学深井瓦斯抽采与围岩控制技术国家地方联合工程实验室,河南焦作 454003;
3 河南理工大学河南省瓦斯地质与瓦斯治理重点实验室省部共建国家重点实验室培育基地,河南焦作 454003;
4 义马煤业集团孟津煤矿有限责任公司,河南洛阳 471142

收稿日期:2021-04-06 修回日期:2021-06-11 出版日期:2021-07-28 发布日期:2022-01-28
作者简介:张钧祥 (1989—),男,河南洛阳人,博士,讲师,主要从事矿山安全与灾害防治方面的研究。E-mail: zjx@zut.edu.cn。
基金资助:
国家自然科学基金资助(51774119);深井瓦斯抽采与围岩控制技术国家地方联合工程实验室开放基金资助(SJF202002);河南省瓦斯地质与瓦斯治理重点实验室——省部共建国家重点实验室培育基地开放基金资助(WS2020A15);河南省高校重点科研项目基础专项(19zx003)。

Optimization and experimental study of sealing parameters of crossing boreholes based on creep effect

ZHANG Junxiang^1,2,3, LIU Yanwei³, REN Peiliang⁴, HAN Hongkai³, ZUO Weiqin³

1 School of Energy & Environment Engineering, Zhongyuan University of Technology, Zhengzhou Henan 451191, China;
2 State and Local Joint Engineering Laboratory for Gas Drainage & Ground Control of Deep Mines, Henan Polytechnic University, Jiaozuo Henan 454003, China;
3 State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo Henan 454003, China;
4 Yima Coal Industry Group Mengjin Coal Mine Co., Ltd., Luoyang Henan 471142, China

Received:2021-04-06 Revised:2021-06-11 Online:2021-07-28 Published:2022-01-28

摘要/Abstract

摘要： 为解决穿层钻孔封孔难度大、瓦斯抽采效率低的问题,视煤岩体为弹塑性介质,在考虑蠕变效应下建立巷道围岩力学模型;根据Dracy定律,推导浆液流动控制方程,以渗透率变化为桥梁,构建巷道围岩变形与浆液流动的耦合模型;利用COMSOL软件解算该理论模型。数值模拟结果表明:巷道围岩塑性软化区范围由初始时刻4.69 m不断扩大,在100天时稳定于15.19 m;浆液扩展半径随注浆压力的增加而持续增大,当注浆压力高于2.8 MPa后,浆液扩展半径变化较小,逐渐趋于稳定。试验钻孔平均瓦斯体积分数为56.49%,是传统工艺下钻孔平均瓦斯体积分数的3.46倍,在抽采后期仍能维持较高的抽采水平。

关键词: 蠕变效应, 穿层钻孔, 封孔参数, 耦合模型, 数值模拟

Abstract: In order to address problems of difficult sealing of crossing borehole and low efficiency of gas drainage, with coal rock being regarded as elastic-plastic medium, a mechanical model of roadway surrounding rock was established considering creep effect. Then, control equation of grout flow was derived according to Dracy's law, and a coupling model of surrounding rock deformation and grout flow was constructed with permeability change as a bridge. Finally, the model was resolved by using COMSOL software. The numerical simulation results show that plastic softening zone around roadway expands from 4.69 m initially to be basically stable at 15.19 m in 100 days. And grout radius expands continuously with increase of grouting pressure, and tends to be stable when the pressure is higher than 2.8 MPa. Moreover, the average gas concentration of test boreholes reaches to 56.49%, which is 3.46 times that of traditional technology and still maintains a great drainage level in later period.

Key words: creep effect, crossing borehole, sealing parameter, coupling model, numerical simulation

中图分类号:

X936

张钧祥, 刘彦伟, 任培良, 韩红凯, 左伟芹. 基于蠕变效应的穿层钻孔封孔参数优化与试验研究[J]. 中国安全科学学报, 2021, 31(7): 97-104.

ZHANG Junxiang, LIU Yanwei, REN Peiliang, HAN Hongkai, ZUO Weiqin. Optimization and experimental study of sealing parameters of crossing boreholes based on creep effect[J]. China Safety Science Journal, 2021, 31(7): 97-104.

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基于蠕变效应的穿层钻孔封孔参数优化与试验研究

Optimization and experimental study of sealing parameters of crossing boreholes based on creep effect

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