The application of integrated geophysical method to karst pipeline distribution
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摘要: 为了预测和评价赤泥堆场建成后对地下水环境造成的污染，利用等偏移地震反射法、高密度电法为主，自然电场法为辅的综合物探技术来探查堆场地下岩溶的发育特征和管道的分布状况。经上述3种物探技术综合探测，确定出堆场各处覆盖层的厚度，确认了5个断层破碎带及其走向，圈定了14个物探异常区，并初步探明了岩溶管道的分布和地下水的流向。同时综合物探技术与钻探成果揭示了研究区岩溶发育的特点是以浅部垂直型为主，浅层岩溶的发育深度大约在地表下0～10 m，深部岩溶也有少量发育，其发育深度约在地面下40～50 m，超过此深度后岩溶发育变弱。Abstract: To predict and evaluate the impact of the Red Mud Stack Yard on groundwater system after the mud dump was completed, the integrated geophysical techniques, which primarily consist of common offset seismic reflection and electrical resistivity tomography and is assisted by the natural electric field method, were used to investigate the characteristics of karst underground and pipeline distribution at the site. As a result, the cover layer thickness of the entire dump yard was determined; five fracture zones and their strikes were confirmed respectively; fourteen geophysical prospecting anomalous zones were delineated; and the karst pipeline distribution features and groundwater flow direction were preliminarily identified. By combining the integrated geophysical techniques with the drilling results, it was found that the karst development in the study area is characterized by the shallow vertical type. The shallow karst is well developed at the depth of about 0-10 m below the surface. Besides, there is also some deep karstic features were identified at the depth of about 40-50 m below the surface, beyond this depth karst development becomes rare and weak.
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