构造应力下采空区上覆岩层破坏规律数值模拟

发布时间：2018-04-01 19:09

本文选题：数值模拟　切入点：构造应力　出处：《煤矿安全》2017年01期

【摘要】：为研究构造应力下采空区上覆岩层的破坏规律,以山东新河矿业有限公司3下06工作面为工程背景,运用FLAC3D数值模拟、理论分析等方法对不同构造应力场中采空区上覆岩层的破坏规律进行了研究。结果表明:随着侧压系数的增大,采空区覆岩塑性区的范围和发育高度先减小后增大,其形状经历了从马鞍形到枕形再到拱形直至最终变化为帽形的过程;采空区顶底板受采动影响形成了明显的应力降低区域,随着侧压系数的增大,应力降低区域沿顶板进一步扩大,底板的应力降低区域沿底板则逐渐减小,顶板的拉应力区域减小,采空区两侧的应力集中区域增大,应力集中现象增强;采空区底板破坏的范围和深度随侧压系数的增加而不断增大。
[Abstract]:In order to study the failure law of overlying strata in goaf under structural stress, the FLAC3D numerical simulation is used to simulate the overlying strata in Xinhe Mining Co., Ltd., Shandong Xinhe Mining Co., Ltd. Theoretical analysis and other methods are used to study the failure law of overlying strata in goaf in different tectonic stress fields. The results show that with the increase of lateral pressure coefficient, the extent and development height of plastic zone of overburden in goaf decreases first and then increases. Its shape has experienced the process from saddle shape to pillow shape to arch shape until finally change to cap shape, the roof and bottom plate of goaf is affected by mining to form obvious stress reduction area, with the increase of lateral pressure coefficient, The stress reduction area expands further along the roof, the stress reduction area of the floor decreases gradually along the floor, the tensile stress region of the roof decreases, the stress concentration area on both sides of the goaf increases, and the stress concentration phenomenon increases. The extent and depth of floor failure in goaf increase with the increase of lateral pressure coefficient.
【作者单位】：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(51574154,51274133,51474137)
【分类号】：TD325

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