预裂弱化对关键层板破坏特征影响的模拟研究

发布时间：2018-03-15 22:25

本文选题：工作面顶板　切入点：液压支架压架　出处：《中国煤炭》2016年11期 　论文类型：期刊论文

【摘要】：采用三维数值模拟软件FLAC3D,并结合祁东煤矿8222工作面具体开采条件,就预裂爆破对覆岩关键层板破坏特征的影响进行了模拟研究。结果表明,通过对关键层进行预裂弱化,改变了常规情况下顶板O—X型初次破断特征。顶板将先从开采空间中部弱化位置处产生裂缝,然后在两侧长边处开裂,最终在工作面两端形成一定的三角区,关键层的极限破断步距较常规情况下也明显减小。预裂弱化通过改变顶板的破坏特征,减小顶板的初次破断步距,进而避免厚硬顶板大面积破断引发压架等灾害。
[Abstract]:By using 3D numerical simulation software FLAC3D and combined with the specific mining conditions of Qidong Coal Mine 8222 face, the effects of pre-splitting blasting on the failure characteristics of key strata in overburden rock are simulated and studied. The results show that the pre-cracking of key strata is weakened. The initial breaking characteristics of roof O-X are changed under normal conditions. The roof will first produce cracks from the weakening position in the middle of the mining space, then crack at the long sides on both sides, and finally form a certain triangle area at both ends of the working face. The limit breaking step distance of the key layer is also obviously reduced than that of the conventional case. The pre-crack weakening reduces the initial breaking step distance of the roof by changing the failure characteristics of the roof, and thus avoids the large area breaking of thick and hard roof and the occurrence of the pressure frame and so on.
【作者单位】：中国矿业大学矿业工程学院;
【基金】：国家自然科学基金资助项目(51404246) 江苏省自然科学基金资助项目(BK20140205) 中国矿业大学优秀创新团队资助项目(2014ZY004)
【分类号】：TD327.2

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