Key Bearing Structure Instability Mechanism: A Case Study in Mining Under Close-Distance Coal Pillar

IF 1.2 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geofluids Pub Date : 2024-08-27 DOI:10.1155/2024/1321869
Jieyang Ma, Shihao Tu, Hongsheng Tu, Kaijun Miao, Hongbin Zhao, Long Tang
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Abstract

This study is aimed at solving the issue of mining under the boundary coal pillar of the close-distance coal seam that causes roof falling. This study established a new key bearing structure model for analyzing the structural instability mechanism when mining under the coal pillar at the working face by taking Shaping Coal Mine as an example. The purpose of this study is to analyze the formation process, load transfer mechanism, and two failure types of the key bearing structure using theoretical analysis and numerical simulation. Additionally, this study discussed the timing and method of roof control for different key bearing structure failure types. Research shows that the instability of the key bearing structure composed of the coal pillar, interlayer rock, and lower coal body is the important reason behind the roof falling. The instability types of key bearing structures include the coal pillar instability type and the cantilever beam instability type. The stability width of the interlayer rock cantilever beam and the coal pillar jointly ascertain the failure type of the key bearing structure. In the 9204 working face, the key bearing structure was destroyed when the coal pillar was 14 m wide, resulting in the roof stress being as high as 31.81 MPa. The stress drop phenomenon can be used as a boundary to divide the failure process of the key bearing structure into three stages. The pressure relief of the coal pillar and interlayer rock cantilever beam is an effective way to deal with this problem, and the coal pillar instability type needs to be pressure relieved earlier than the cantilever beam instability type. The research findings offer new insights into the roof stability control of mining under the coal pillar.

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关键支承结构失稳机理:近距离煤柱下采矿案例研究
本研究旨在解决近距离煤层边界煤柱下开采引起顶板冒落的问题。本研究以沙坪煤矿为例,建立了一种新的关键支承结构模型,用于分析工作面煤柱下开采时的结构失稳机理。本研究的目的是通过理论分析和数值模拟,分析关键支承结构的形成过程、荷载传递机理和两种破坏类型。此外,本研究还探讨了不同关键支承结构失效类型的顶板控制时机和方法。研究表明,由煤柱、夹层岩和下部煤体组成的关键支承结构失稳是造成顶板冒落的重要原因。关键支承结构的失稳类型包括煤柱失稳型和悬臂梁失稳型。层间岩悬臂梁和煤柱的稳定宽度共同决定了关键支护结构的失稳类型。在 9204 工作面,当煤柱宽度为 14 m 时,关键支承结构被破坏,导致顶板应力高达 31.81 MPa。以应力下降现象为界,可以将关键支承结构的破坏过程分为三个阶段。煤柱和层间岩悬臂梁的卸压是解决这一问题的有效方法,煤柱失稳型比悬臂梁失稳型需要提前卸压。这些研究成果为煤柱下开采的顶板稳定性控制提供了新的思路。
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来源期刊
Geofluids
Geofluids 地学-地球化学与地球物理
CiteScore
2.80
自引率
17.60%
发文量
835
期刊介绍: Geofluids is a peer-reviewed, Open Access journal that provides a forum for original research and reviews relating to the role of fluids in mineralogical, chemical, and structural evolution of the Earth’s crust. Its explicit aim is to disseminate ideas across the range of sub-disciplines in which Geofluids research is carried out. To this end, authors are encouraged to stress the transdisciplinary relevance and international ramifications of their research. Authors are also encouraged to make their work as accessible as possible to readers from other sub-disciplines. Geofluids emphasizes chemical, microbial, and physical aspects of subsurface fluids throughout the Earth’s crust. Geofluids spans studies of groundwater, terrestrial or submarine geothermal fluids, basinal brines, petroleum, metamorphic waters or magmatic fluids.
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