曲江煤矿地表塌陷成因时空关系分析

发布时间：2018-05-31 14:46

  本文选题：地表塌陷 + 岩溶溶洞　； 参考：《煤炭科学技术》2017年01期

【摘要】：为了研究曲江煤矿地表塌陷机理和原因,基于本区地表塌陷时空特征、地质勘探结果、年降水量季节变化规律、地震记录数据、煤矿开采条件等资料,对该矿9处地表塌陷成因与地下孔洞、降水量、地震、开采等因素进行了时间与空间关系分析。研究表明:地表塌陷周边存在土洞,且埋深与相对塌陷距离多数在20 m以内,浅部存在孔洞和盖层薄是地表塌陷的本质内因;每年3月水位最低,4—6月降水量最多,共发生塌陷7处,地下水位下降和雨季盖层弱化是地表塌陷的直接外因;塌陷发生时间(除1号塌陷)与地震发生时间前后间隔均在3个月之内,地震是地表塌陷的诱发外因;井下开采与地表塌陷的相关性不明显,但对地表塌陷位置存在采动影响。
[Abstract]:In order to study the mechanism and cause of surface collapse in Qujiang coal mine, based on the spatial and temporal characteristics of surface collapse in this area, geological exploration results, seasonal variation of annual precipitation, seismic record data, mining conditions of coal mine, etc. The relationship between time and space of 9 ground subsidence causes, underground holes, precipitation, earthquakes, mining and so on has been analyzed in this paper. The results show that there are soil holes around the surface collapse, and the distance between the depth of burial and the relative collapse is less than 20 m, the existence of holes and thin caprocks in the shallow part is the essential internal cause of the surface collapse, and the precipitation of the lowest water level in March is the highest in April-June of each year. The downfall of groundwater level and the weakening of the cover in the rainy season are the direct external causes of the surface collapse, and the time between the collapse (except the No. 1 collapse) and the time before and after the earthquake are within 3 months, and the earthquake is the induced external cause of the surface collapse. The correlation between underground mining and surface subsidence is not obvious, but there is a mining effect on surface collapse position.
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本文编号：1960164