工作面向正断层推进支承应力演化规律

发布时间：2018-04-13 18:13

本文选题：正断层 + 上下盘工作面　；参考：《煤矿安全》2017年01期

【摘要】：以正断层赋存条件下厚煤层开采为研究背景,采用FLAC3D数值模拟,研究了上、下盘工作面分别向正断层推进时支承应力演化规律,揭示了工作面向正断层开采的致灾规律。研究表明:断层带切割了顶底板岩层的完整性,采动应力的阻隔效应显著,致使断层煤柱易形成较高的应力集中区;下盘向正断层推进时,存在支承应力突增点,使断层煤柱发生塑性破坏,释放大量弹性能;上盘向正断层推进时,支承应力平缓增加,且推进过程中部分应力能够向下盘转移,在下盘形成较小应力集中区,应力曲线呈现一大一小"双驼峰"状。
[Abstract]:Based on the research background of thick coal seam mining under the condition of normal fault occurrence, FLAC3D numerical simulation is used to study the evolution law of supporting stress in upper and lower face respectively to normal fault, and to reveal the disaster causing law of working face normal fault mining.The study shows that the fault zone cuts the integrity of the top and bottom strata, and the barrier effect of mining stress is obvious, which leads to the formation of high stress concentration areas in the fault pillar, and the existence of supporting stress bulge when the footwall moves toward the normal fault.When the upper face pushes toward the normal fault, the support stress increases slowly, and some stresses can be transferred down to the lower side, forming a small stress concentration area in the lower side, which causes plastic failure of the coal pillar of the fault and releases a large amount of elastic energy.The stress curve shows a large and small "double hump" shape.
【作者单位】：山东科技大学矿业与安全工程学院;山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地;
【基金】：国家自然科学基金资助项目(51574155) 泰安市科技发展计划资助项目(2015ZC1058)
【分类号】：TD323

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