浅厚煤层漏气裂缝的演变与致灾特征:案例研究

IF 1.5 4区 工程技术 Q3 METALLURGY & METALLURGICAL ENGINEERING
Wei Zhang, Deming Wang, Zhenhai Hou, Chenguang Wang
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引用次数: 0

摘要

开采引起的裂隙复合漏风是浅埋煤层煤炭自燃和瓦斯爆炸的重要原因。通过物理模拟和数值计算,阐明了开采过程中漏风裂隙的动态演化规律。结果表明,覆盖层和地表裂缝是煤层中气流的主要通道。此外,所有裂缝的产生主要受关键地层的控制。在采矿过程中,覆盖层裂缝的动态发展十分明显,裂缝经历了张开、闭合和稳定的过程。覆盖层断裂的空间分布呈双梯形。在低梯形区域,总体断裂密度较高,但由于压实作用,中间断裂密度较低。在高梯形中,水平断裂分布广泛,规模较大,垂直断裂主要分布在两侧和中间,与水平断裂相互连通,穿透地表,形成复合漏气通道。来自地表和巷道的大量裂隙是造成白家沟煤矿2421-1工作面后深部多源漏风的主要原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Evolution and Disaster-Causing Characteristics of Air-Leakage Fractures in Shallow Thick Coal Seams: A Case Study

Evolution and Disaster-Causing Characteristics of Air-Leakage Fractures in Shallow Thick Coal Seams: A Case Study

Composite air leakage from mining-induced fractures is a critical cause of coal spontaneous combustion and gas explosions in a shallow-buried goaf. Physics simulations and numerical calculations were performed to elucidate the dynamic evolution law of air-leakage fractures during mining. The results showed that overburden and surface fractures were the main channels for airflow in the goaf. Additionally, the generation of all fractures was primarily controlled by the key stratum. The dynamic development of overburden fractures was evident during mining, and the fractures underwent opening, closing, and stabilization. The spatial distribution of the overburden fractures was shaped like a double trapezoid. In the low trapezoid, the overall fracture density was high, but the middle fractures were poor because of compaction. In the high trapezoid, horizontal fractures were widely distributed and relatively large, and vertical fractures were mainly distributed on the sides and middle, which were interconnected with the horizontal fractures and penetrated the surface to form composite air-leakage channels. The abundance of fractures from the surface and goaf was the primary cause of multi-source air leakages deep behind the 2421–1 working face in the Baijigou coal mine.

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来源期刊
Mining, Metallurgy & Exploration
Mining, Metallurgy & Exploration Materials Science-Materials Chemistry
CiteScore
3.50
自引率
10.50%
发文量
177
期刊介绍: The aim of this international peer-reviewed journal of the Society for Mining, Metallurgy & Exploration (SME) is to provide a broad-based forum for the exchange of real-world and theoretical knowledge from academia, government and industry that is pertinent to mining, mineral/metallurgical processing, exploration and other fields served by the Society. The journal publishes high-quality original research publications, in-depth special review articles, reviews of state-of-the-art and innovative technologies and industry methodologies, communications of work of topical and emerging interest, and other works that enhance understanding on both the fundamental and practical levels.
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