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工程力学  2013 

卧庄矿15#煤石灰岩顶板稳定性判别计算

DOI: 10.6052/j.issn.1000-4750.2012.04.0238, PP. 270-275

Keywords: 石灰岩顶板,稳定性,解析计算,弹性地基梁,Fourier积分变换

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Abstract:

在晋城矿区随着3#煤资源的逐步枯竭,许多矿井迫切希望能够开采15#煤层。但15#煤顶板为厚、硬的石灰岩顶板,开采可能形成顶板大面积悬露而突然断裂垮落、造成生产安全问题。该文针对卧庄煤矿15#煤层的赋存情况,根据关键层理论确定老顶岩梁,采用弹性地基梁模型解析计算其弯曲挠度;采用Fourier积分变换方法解析计算底板岩层的底鼓量;并计算直接顶的冒落高度。根据老顶弯曲挠度、底板底鼓量和煤层冒落高度三者之和充满采空区,来确定相对应的开采宽度,以判别其石灰岩顶板的稳定性。计算显示:当控制直接顶石灰岩-1、石灰岩-2随开采及时冒落、开采宽度达到22.55m时,老顶岩层可与冒落岩石相接触,表明卧庄矿15#煤层开采是安全的。这里所采用的分析方法对于晋城矿区及相类似坚硬顶板煤层的安全开采具有参考价值。

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