构造应力作用下厚硬顶硬煤层巷道围岩控制技术

IF 2.8 4区 工程技术 Q2 ENGINEERING, CHEMICAL Processes Pub Date : 2024-09-13 DOI:10.3390/pr12091973
Zhongzong Cao, Honglin Liu, Chengfang Shan, Hongzhi Wang, Haitong Kang
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引用次数: 0

摘要

在煤层厚、顶板硬的巷道掘进过程中,煤岩体中积聚的大量弹性能量瞬间释放,造成灾害。特别是在构造应力作用下,巷道围岩的动力灾害极为强烈。因此,本文以榆树岭煤矿110505巷道为工程背景。针对巷道围岩变形严重、矿山压力大的问题,通过理论分析、室内试验、数值模拟和现场测试等手段,研究了巷道围岩变形机理,提出了围岩控制技术。首先,研究结果表明,榆树岭煤矿应力场类型为σHv型,最大水平主应力方位角集中在110.30°~114.12°,倾角为-33.04°~-3.43°,最大水平主应力为最小水平主应力的1.94~2.76倍。其次,5 号岩样的脆性指数为 0.62;围岩压能底板岩样的破坏能量释放高达 15 万 mv * ms。岩样累计数量越多,强度越大,破坏越严重。第三,随着构造应力的增加,巷道围岩应力呈不对称分布,塑性区沿倾向发展。最后,根据巷道围岩 "左侧>顶板>右侧>底板 "的变形特征,提出了 "非对称锚网索支护+钻孔卸压 "的围岩控制技术,实现了对巷道围岩变形的有效控制。
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Surrounding Rock Control Technology of Thick Hard Roof and Hard Coal Seam Roadway under Tectonic Stress
In the process of roadway excavation in thick and hard coal seams with a hard roof, the instantaneous release of a large amount of elastic energy accumulated in coal and rock mass causes disasters. Especially under the action of tectonic stress, dynamic disasters of roadway-surrounding rock are extremely strong. Therefore, this paper takes the 110,505 roadway of the Yushuling Coal Mine as the engineering background. Aiming at the serious deformation of roadway-surrounding rock and the problem of strong mine pressure, the deformation mechanism of roadway-surrounding rock is studied by means of theoretical analysis, indoor experimentation, numerical simulation and field testing, and the surrounding rock control technology is proposed. Firstly, the results show that the stress field type of the Yushuling Coal Mine is a σHv type, the azimuth angle of the maximum horizontal principal stress is concentrated in 110.30°~114.12°, the dip angle is −33.04°~−3.43°, and the maximum horizontal principal stress is 1.94~2.76 times of the minimum horizontal principal stress. Secondly, the brittleness index of No. 5 is 0.62; the failure energy release of the surrounding rock compressive energy floor rock sample is up to 150,000 mv * ms. The more the cumulative number of rock samples, the greater the strength, and the more severe the damage. Thirdly, with the increase in tectonic stress, the stress of roadway-surrounding rock is asymmetrically distributed, and the plastic zone develops along the tendency. The maximum range of the plastic zone expands from 4.18 m to 10.19 m. Lastly, according to the deformation characteristics of roadway-surrounding rock, left side > roof > right side > floor, the surrounding rock control technology of ‘asymmetric anchor net cable support + borehole pressure relief’ is proposed, which realizes the effective control of roadway-surrounding rock deformation.
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来源期刊
Processes
Processes Chemical Engineering-Bioengineering
CiteScore
5.10
自引率
11.40%
发文量
2239
审稿时长
14.11 days
期刊介绍: Processes (ISSN 2227-9717) provides an advanced forum for process related research in chemistry, biology and allied engineering fields. The journal publishes regular research papers, communications, letters, short notes and reviews. Our aim is to encourage researchers to publish their experimental, theoretical and computational results in as much detail as necessary. There is no restriction on paper length or number of figures and tables.
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