Effects of the borehole drainage for roof aquifer on local stress in underground mining

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.24.5.479
Jianli Shao, Qi Zhang, Zhang Wenquan, Zaiyong Wang, Xintao Wu
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引用次数: 9

Abstract

Pre-drainage of groundwater in the roof aquifer by boreholes is the main method for prevention of roof water disaster, and the drop in the water level during the drainage leads to the variation of the local stress in the overlying strata. Based on a multitude of boreholes for groundwater drainage from aquifer above the 1303 mining face of Longyun Coal Mine, theoretical analysis and numerical simulation are used to investigate the local stress variation in the process of borehole drainage. The results show that due to the drop in the water level of the roof aquifer during the drainage, the stress around the borehole gradually evolved. From the center of the borehole to the outside, a stress-relaxed zone, a stress-elevated zone, and a stress-recovered zone are sequentially formed. Along with the expansion of drainage influence, the stress peak in the stress-elevated zone also moves to the outside. When the radius of influence develops to the maximum, the stress peak position no longer moves outward. When the coal mining face advances to the drainage influence range, the abutment pressure in front of the mining face is superimposed with the high local stress around the borehole, which increases the risk of stress concentration. The present study provides a reference for the stress concentration caused by borehole drainage, which can be potentially utilized in the optimal arrangement of drainage boreholes in underground mining.
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顶板含水层钻孔排水对地下开采局部应力的影响
钻孔预排顶板含水层地下水是预防顶板水害的主要方法,预排过程中水位的下降会引起上覆岩层局部应力的变化。以龙云煤矿1303工作面上方含水层多钻孔为基础,采用理论分析和数值模拟相结合的方法,对钻孔排水过程中的局部应力变化进行了研究。结果表明:由于顶板含水层在排水过程中水位下降,钻孔周围应力逐渐演化;从井眼中心向外依次形成应力松弛区、应力升高区和应力恢复区。随着排水影响的扩大,应力升高区的应力峰值也向外移动。当影响半径发展到最大时,应力峰值位置不再向外移动。当采煤工作面推进到排水影响范围时,采煤工作面前方的支承压力与钻孔周围的高局部应力叠加,增加了应力集中的风险。本研究为钻孔排水引起的应力集中提供了参考,可用于地下开采排水钻孔的优化布置。
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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