铁路小煤窑采空区综合勘察方法应用研究

Application on Comprehensive Survey Method in Coalfield Mined-out Areas Beneath Railways

小窑采空区一般具历史悠久,开采无规划,分布无规律,搜集资料困难等特点,常规单一的勘察手段较难查清小窑采空的分布规律,大力开展综合勘探工作显得尤为重要.安九高铁安庆西站小煤窑采空段落采用综合勘察方法:以走访调查、分析已有资料为基础,首先布置高密度电法圈定采空区大体走向及发育范围;然后针对异常区域布置等值反磁通瞬变电磁测线,进一步圈定平面位置及空间走向,最后布置钻探验证综合物探成果,对各项勘察方法对比分析后得出勘察结论.实践表明:该勘察方法效率高,勘察成果精度高,且避免了盲目钻探造成的浪费,对类似铁路工程小煤窑采空区勘察具有一定的指导意义.

Because of long mining history,unplanned mining activities,irregular distribution of goaf and difficulties in collecting related information,it is hard to find out the distribution law of mined-out areas.In this case,the application on comprehensive survey seems to be particularly important.The comprehensive survey method was applied to a goaf beside Anqing West Railway Station along Anqing to Jiujiang Railway,aiming at checking the distribution of goaf based on field investigation and analysis of known data.Firstly,the orientation and developmental range of the goaf were roughly delineated by applying the high-density resistivity method.Secondly,the plane position and spatial ditribution of the goaf were further check by setting equivalent reverse flux transient electromagnetic lines for abnormal areas.Finally,geological drilling was applied to examine the results of comprehensive geophysical exploration.The geological investigation conclusions could be drawn after statistics-comparison-analysis.The practice indicates that this kind of geological survey methods can not only improve survey eficiency and accuracy but also reduce unecessary waste.Consequently,it will bring some valuable references to comprehensive survey in coalfield mined-out areas beneath railways.