特厚冲积层下开采覆岩移动及地表变形特征研究  

Study on Overburden Movement and Surface Deformation Characteristics of Mining under Extra Thick Alluvial Layer

作　　者：唐世界 陈攀 TANG Shijie;CHEN Pan(Jiaozuo Coal(Group)Co.,Ltd.,Jiaozuo 454150,China;Jiaozuo Coal(Group)Xinxiang Energy Co.,Ltd.,Xinxiang 453634,China)

机构地区：[1]焦作煤业(集团)有限责任公司,河南焦作454150 [2]焦作煤业(集团)新乡能源有限公司,河南新乡453634

出　　处：《煤炭技术》2023年第9期91-96,共6页Coal Technology

基　　金：国家自然科学基金联合基金重点支持项目(U21A20108)。

摘　　要：为了研究特厚冲积层地质条件下开采地表移动变形规律的独特性,以赵固二矿某工作面地质条件为原型,采用UDEC数值模拟软件建立了特厚冲积层下开采的模型,模拟了该地质条件下开采引起的冲积层和基岩不同的下沉变化特征,并重点分析了不同厚冲积层厚度与地表移动规律之间的关系。研究表明,特厚冲积层下开采基岩层呈现垮断式下沉,上部冲积层各层位呈现出整体下沉的特征,所形成的下沉盆地范围大,下沉值在边缘处收敛较慢;水平移动变形值和水平移动系数对冲积层厚度变化尤为敏感,当冲积层厚度与采深比h/H由0.51增至0.84时,最大水平移动值增大101.6%,水平移动系数增大60%。分析得出了适合赵固矿区的冲积层厚度与采深比与地表下沉系数和地表水平移动系数所对应的函数关系,研究结果为本矿区合理留设村庄保护煤柱以及科学指导采煤沉陷区治理提供技术支撑。In order to study the particularity of surface movement and deformation under the geological and mining conditions of extra-thick alluvial layer,takes the geological conditions of a working face in Zhaogu No.2 mine as the prototype and used UDEC numerical simulation software to establish a mining model under extra-thick alluvial layer.The different vertical displacement characteristics of alluvium and bedrock caused by mining under the geological mining conditions were simulated,and the relationship between the thickness of different thick alluvium and the law of surface movement was analyzed.The research showed that the bedrock layer mined under the extra thick alluvium showed a cross-sectional subsidence,and each layer of the upper alluvium showed the characteristics of overall subsidence.The scope of the subsidence basin formed was large,and the subsidence value converged slowly at the edge;the horizontal movement deformation value and horizontal movement coefficient were particularly sensitive to the change of alluvium thickness.When the ratio of alluvium thickness to mining depth h/H increased from 0.51 to 0.84,the maximum horizontal movement value increased by 101.6%and the horizontal movement coefficient increased by 60%.The functional relationship between alluvium thickness and mining depth ratio,surface subsidence coefficient and surface horizontal movement coefficient suitable for Zhaogu mining area was analyzed.The research results provided technical support for the reasonable retention of village protective coal pillars in the mining area and the scientific guidance of the treatment of coal mining subsidence areas.

关 键 词：冲积层 数值分析 水平移动 下沉 回归分析 

分 类 号：TD325[矿业工程—矿井建设]