离散裂隙特征对长壁顶板煤稳定性的影响

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Acta Montanistica Slovaca Pub Date : 2023-02-20 DOI:10.46544/ams.v27i4.02
LE TienDung, Hong Quang Dao, VU DinhHieu
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引用次数: 1

摘要

长壁放顶煤法在盾构支护前(顶煤落落)和盾构支护后(顶煤放顶煤落落)均可能在厚煤层中存在离散裂隙,并对顶煤稳定性产生重大影响。在这种条件下,顶煤的稳定性在文献中还没有得到很好的理解,并且从落煤或垮落行为两方面进行了研究。本文采用基于非连续介质的数值计算程序,研究了煤层中存在离散裂隙,且裂隙特征(方向、密度、刚度、强度、裂隙相交)不同时长壁顶煤的稳定性。研究表明,离散裂隙的存在降低了盾构支护前顶煤的稳定性,特别是在初始回采阶段。参数化研究发现,当裂隙方向与正x轴成90度角时,对顶煤落煤的影响最小。裂隙向采空区突入有利于放顶煤,向非采空区突入有利于放顶煤。研究表明,裂隙密度与顶煤落煤和顶煤冒落成正比。裂隙刚度和强度与顶煤落煤和冒落均成反比。煤层强度、弹性模量、煤层深度等特征对顶煤落煤有重要影响。本文的研究结果可以帮助工程师在煤层存在和变化离散裂隙的情况下改进底板几何设计和顶板控制,从而实现高效地下开采。
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Impact of Discrete Fracture Characteristics on Longwall Top Coal Stability
Discrete fractures may exist in thick coal seam and significantly impact the top coal stability in the Longwall Top Coal Caving method (LTCC) both ahead of shield support (top coal fall) and behind shield support (top coal caving). The top coal stability in such conditions is not well understood in the literature and has been studied from either fall or caving behaviour. In this paper, a discontinuum-based numerical program is used to study longwall top coal stability when discrete fractures exist in coal seam and vary in characteristics (i.e., orientation, density, stiffness, strength, and intersecting fractures). The study demonstrates that the existence of discrete fractures decreases the top coal stability ahead of shield support, particularly in initial face extraction. The parametric study finds that when the fracture orientation makes an angle of 90 degrees to the positive x-axis, it has the least impact on top coal fall. When the fractures plunge into the mined-out area, they facilitate top coal caving and vice versa when they plunge into the unmined area. The study reveals that the fracture density is directly proportional to top coal fall and top coal caving. Meanwhile, the fracture stiffness and strength are inversely proportional to both top coal fall and caving. The study also demonstrates the important role of coal seam characteristics (strength, elastic modulus, and depth) in top coal fall. The findings from this paper can assist engineers in improving panel geometry design and roof control for efficient underground mining when discrete fractures exist and vary in a coal seam.
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来源期刊
Acta Montanistica Slovaca
Acta Montanistica Slovaca 地学-地球科学综合
CiteScore
3.60
自引率
12.50%
发文量
60
审稿时长
30 weeks
期刊介绍: Acta Montanistica Slovaca publishes high quality articles on basic and applied research in the following fields: geology and geological survey; mining; Earth resources; underground engineering and geotechnics; mining mechanization, mining transport, deep hole drilling; ecotechnology and mineralurgy; process control, automation and applied informatics in raw materials extraction, utilization and processing; other similar fields. Acta Montanistica Slovaca is the only scientific journal of this kind in Central, Eastern and South Eastern Europe. The submitted manuscripts should contribute significantly to the international literature, even if the focus can be regional. Manuscripts should cite the extant and relevant international literature, should clearly state what the wider contribution is (e.g. a novel discovery, application of a new technique or methodology, application of an existing methodology to a new problem), and should discuss the importance of the work in the international context.
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