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首页> 外文会议>The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)论文集 >Study about Destruction Depth of Floor and Optimization of Declining Length of Working Face in Second Mine of Zhenxing
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Study about Destruction Depth of Floor and Optimization of Declining Length of Working Face in Second Mine of Zhenxing

机译：镇兴二矿底板破坏深度及工作面下降长度优化研究。

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Based on the actual geological condition of 11 regions in the second mine of Zhenxing, the numerical simulation and the theoretical analysis were used to study the stress distribution condition nearby working face, the relations between declining length of working face and stress concentration factor above coal pillar, the distribution condition of plastic zone in floor of working face, the relations between declining length of working face and destruction depth of floor. The findings indicated: The declining length of working face immediately influence the stress distribution's shape and the size of surrounding rock, the abutment pressure on coal pillar was dispersively transmited to deep floor, the degree of stress concentration on coal pillar increase along with the declining length of working face and drive to a fixed value when the length of working face exceed a certain value; The end socket of working face produces the compound failure of pull-shearing firstly when mining of working face achieve certain length, and gradually expands along vertical and horizontal direction, forms the fracted zone composed of many crevasses finally; The floor is destructed when the tensile stress in floor rock surpasse its tensile strength; The mining of working face may affect the stress distribution of neighboring region, the water bursting does not always occurs in the working face of mining, water bursting accident is possibly to be induced in the neighboring region; Longer of declining length of working face, bigger of destruction depth of floor;, They fit the logarithmic function relations between the declining length of working face and the destruction depth of floor, the declining length of working face of 11 regions in the second mine of Zhenxing is suggested not to surpass 100m.
机译：根据镇兴二矿11个地区的实际地质情况，采用数值模拟和理论分析的方法研究了工作面附近的应力分布状况，工作面下降长度与煤柱上方应力集中系数之间的关系。 ，工作面底板塑性区的分布状况，工作面长度下降与底板破坏深度之间的关系。研究结果表明：工作面长度的减小立即影响应力分布的形状和围岩的大小，煤柱上的基台压力分散地传递到深层底板，煤柱上的应力集中程度随着长度的减小而增加。工作面长度超过一定值时，驱动至固定值;当工作面开采达到一定长度时，工作面端承窝首先产生拉剪复合破坏，并沿垂直和水平方向逐渐扩展，最终形成由许多裂缝组成的裂隙带;当地板岩石中的拉应力超过其抗拉强度时，地板会被破坏。工作面的开采可能会影响邻近区域的应力分布，在开采的工作面中并不总是发生突水现象，可能在邻近区域引发突水事故。工作面下降长度越长，底板破坏深度越大;，它们满足了工作面下降长度与底板破坏深度，11个矿区11个区域工作面下降长度之间的对数函数关系。建议振兴不要超过100m。

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