水体下煤层采动覆岩裂隙扩展判断方法及突水机理研究
首发时间:2012-12-12
摘要:工作面突水是影响水体下煤层安全开采的主要隐患,而顶板冒落和导水裂缝带发育是引起工作面突水的根本路径。从发育形态上看裂隙的萌生发育有两种类型,其一是原生节理裂隙的张开或滑动,二是新的裂隙向完整结构扩展,在两者共同作用下裂隙贯通,形成导水裂隙带。在工程荷载作用下,卸荷裂隙的萌生和扩展具有优势定向性特征。本文考虑开采煤层覆岩裂隙扩展分布特征,建立了裂隙扩展的分析模型和判断方法。借助FISH语言,将扩展模型耦合入离散元软件UDEC中,并用其模拟水体下煤层开采过程,分析在工作面推进过程中上覆岩层内裂隙带萌生演化特征。结合导水裂隙带高度现场观测实践,研究水下采煤工作面导水裂隙带高度确定方法,分析工作面突涌水机理。
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Study on crack expansion judgment model in overlying strata and water inrush mechanism for coal mining under aquifers
Abstract:The safety of coal mining under aquifers is significantly affected by the risk of a water inrush into the mining face, while, the falling of overlying rocks and propagation of fractures are major factors for water inrush. There are two types for the propagation of cracks in the aspect of morphological characteristic, one is the opening or sliding of original cracks, the other is the extension of new cracks to the complete structure, these two reasons eventually lead to fissures linked together to form water flowing fractured zone. The generation and expansion of the rock fracture exhibits a certain direction under external forces, and the stress-release crack induced by underground excavation shows obvious characteristics of parallel or perpendicular to the free surface. An analysis model and corresponding judgment method is proposed considering the characteristic of crack propagation. A secondary exploitation of the 2-dimensional distinct element program (UDEC4.0) is carried out in virtue of the inner-embed FISH language, and it is used to simulate the process of coal mining under aquifers, analyze the generation and evolution of fractures in overlying strata with the advancement of mining face. Together with observational practices, we research determination method for the height of water flowing fractured zone and the formation mechanism of water inrush into mining face.
Keywords: coal mining under aquifers crack propagation water-flowing fractured zone water inrush into mining face
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水体下煤层采动覆岩裂隙扩展判断方法及突水机理研究
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