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杜家村矿大倾角松软煤层综放开采矿压特征与围岩控制
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摘要
本文以杜家村矿1201大倾角松软厚煤层工作面开采为研究背景,采用了理论分析、数值模拟、实验室物理模拟试验、现场监测等方法,对大倾角松软厚煤层综放开采矿压显现规律及围岩控制技术进行了研究;运用理论分析与数值模拟的方法,对该工作面巷道和采场围岩控制技术进行了研究。研究表明:工作面采场矿压显现上部最强,中段次之,下段最弱,覆岩顶板形成“厂”型弯曲结构移动拱,“三带”高度上呈现出下小上大逐渐变化的形态;回风平巷采用切圆拱形断面与锚网索联合支护,运输平巷留三角煤断面加锚网索支护的形式,能有效改善巷道围岩的应力状态并控制巷道围岩变形;运用采一放一(0.6m)的放煤步距和单轮间隔多口的放煤方式,同时避免支架滑移、倾倒和煤壁的失稳破坏,有助于采场围岩稳定和动态控制。
This paper put Dujiacun Mine1201dip soft thick coal seam working face as the research background,and use a laboratory similar material simulation, theoretical analysis, numerical simulation, field measurement methods, and do a big dip soft and thick coal seam pressure behavior law and rock control technology research; We use the theoretical analysis and numerical simulation methods to research the control technology of the face roadway and the surrounding rock. Studies have shown that:the face with mine pressure behavior strongest in the upper part, second in the middle of it,and the weakest was the paragraph.and overlying rock roof formed the "factory" type bent structure of mobile arch, showing a gradual change in the next small big " with" a high degree of patterns; The return air drift cut round arched section with steel mesh and anchor combined support, and the transport drift leave the form of a triangle coal section plus anchor mesh and cable support,which can effectively improve the stress state of the surrounding rock and control the deformation of surrounding rock; and the use of mining release (0.6m) coal drawing and a single round of caving interval of multi-port, at the same time we will avoid the stent to slip, and dump the coal wall instability and failure, which contribute to the stability and dynamics of the surrounding rock controlled.
引文
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