基岩厚度与岩性对关键层破断的影响与力学分析

利用数值模拟工具,研究了不同厚度与岩性的基岩对关键层破断的影响。由此提出净载荷的概念,并在此基础上对模拟结果进行曲线拟合和力学建模分析。数值模拟结果表明,相同基岩厚度时,岩性越硬,关键层破断时所对应的开采步距kp越大;相同岩性条件下,基岩越厚,对应的kp也越大。力学分析发现,基岩的厚度与岩性对关键层的净载荷分布有显著影响,由此而导致关键层弯曲破断行为的差异。

Influence and Mechanical Analysis of Key Stratum Fracture by the Lithology and Thickess of Bedrock

Use numerical simulation tools,study on the influence and mechanical analysis of key stratum fracture by the litho logy and thickness of bedrock and then propose the conception of net loads.Then based on the investigation data,curve fitting and mechanical modeling analysis for the results of numerical simulation.The results of numerical simulation showed that,the same thickness of the bedrock,the more hard rock,breaking a key level at the time corresponding to step away from the exploitation of the greater kp;the same rock conditions,the more thick bedrock,the greater the corresponding kp.Mechanics found that the thickness of rock and rock to the key level of net payloads have a significant impact on the distribution,thus leading to the key-bending breaking behaviours of the difference.