地球物理方法在章丘粘土矿采空区探测中的应用与方法对比

Application and Comparison of Geophysical Methods in Detection of Clay Mined-out Areas

摘要:

在山东章丘地区由于粘土矿长期开采形成了较大面积的采空区，不仅危害着工农业正常生产而且一定程度地制约着当地的经济发展，因此准确探测采空区尤为重要。通过高密度电法几种装置ρa等值线断面图对粘土矿采空区低阻异常特征的比较，证明施贝与三极装置结合可较好地反映采空区的位置；CSAMTρa等值线拟断面图低阻异常形态能较好的反映出采空区的大致空间形态。高密度电法与CSAMT法的有机结合极大地增加了探测粘土矿采空区的准确性和可靠程度，是地质灾害调查与治理首选的物探方法组合之一。

Abstract:

Due to long-term exploitation of clay mineral, a large square of mined-out areas have been formed in Zhangqiu area of Shandong province. It will not only harm the industry and agriculture production in a certain extent, but also restrict the development of local economy. Therefore, the accurate detection of mined-out areas is particularly important. Through the comparison of low-resistant anomalous characteristics of clay mined-out area by using ρa contour lines gained by several high density resistivity devices, it is regarded that combination of Shibei and triode device can better reflect the position of mined-out areas; while low resistivity abnormal morphology of CSAMT ρa isoline section can reflect the general spatial form of mined-out areas. Combination of high density resistivity method and CSAMT method can greatly increase the accuracy and reliability of the detection of clay mined-out areas. It is one of the best combination of geophysical prospection for investigation and treatment of geological hazards.