采动引发地表下沉盆地边缘隆起效应研究

发布时间：2018-11-10 11:57

【摘要】：为了探究地表沉陷盆地边缘隆起现象及其影响因素,采用现场实测和数值模拟等方法,对不同基岩厚度、不同岩性地层进行模拟分析,研究不同采动情况及不同地质条件下地层变形特征。以煤层开采后的覆岩运移结构为基础,建立弹性基础梁力学模型,分析了地表隆起机理及其判据条件。研究结果表明,采动影响和地质条件是影响地表边缘隆起的重要因素。地表整体下沉量和下沉速度随沙基比增大而增大,随顶板岩性普氏系数增强而减小。当基岩厚度过大或覆岩岩性较软时,难以出现地表隆起现象,只有当基岩厚度和岩层普氏系数达到特定条件时,地表下沉盆地边缘方可出现隆起现象,且隆起量与基岩厚度成反比,与岩层普氏系数成正比。
[Abstract]:In order to investigate the uplift phenomenon of the edge of the subsidence basin and its influencing factors, different bedrock thickness and different lithologic strata are simulated and analyzed by field measurement and numerical simulation. The characteristics of formation deformation under different mining conditions and geological conditions are studied. Based on the overburden migration structure after coal seam mining, a mechanical model of elastic foundation beam is established, and the surface uplift mechanism and its criterion conditions are analyzed. The results show that the influence of mining and geological conditions are the important factors affecting the surface edge uplift. The total subsidence and subsidence velocity increase with the increase of the sand base ratio and decrease with the enhancement of the roof lithology. When the thickness of bedrock is too large or the lithology of overlying rock is soft, it is difficult to appear surface uplift. Only when the thickness of bedrock and the Prussian coefficient of rock layer reach a certain condition, can the surface subsidence basin margin appear uplift. The uplift is inversely proportional to the thickness of the bedrock and is directly proportional to the plussian coefficient of the strata.
【作者单位】：中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室;中国矿业大学(北京)力学与建筑工程学院;
【基金】：国家重点基础研究发展计划(973计划)资助项目(2013CB227903)
【分类号】：TD325.4

【相似文献】