泰安市岩溶塌陷特征及探测方法研究

Study on the Characteristics and Detection Methods of Karst Collapse in Tai'an City

摘要:

泰安市岩溶塌陷点主要集中在城区水源地与旧县水源地，对当地居民生产生活造成严重影响，急需查明已知塌陷点范围及隐伏溶洞位置，进行针对性治理。本文通过应用地质雷达、高密度电法与浅层地震，对已知土洞、隐伏溶洞及已知塌陷点进行探测，对东羊娄村与羊西村探测异常进行钻探验证，结果吻合较好。经分析研究认为：地质雷达能较好地分辨浅部土洞的位置；浅层地震探测深度较大，可以较准确地分辨覆盖层厚度与隐伏溶洞的空间位置，但对浅层土洞的分辨率较低；浅层土洞与隐伏溶洞在高密度电法电阻率断面图上有明显的反映，其分辨率不如地质雷达与浅层地震。根据不同物探方法的优点，结合研究区地质情况，提出了综合物探方法探测隐伏岩溶的最优化方案，以供参考。

Abstract:

The karst collapse points in Tai'an city are mainly located in urban water sources and Jiuxian water sources, which have a serious impact on the production and life of local residents. It is urgent to find out the scope of the exposed collapse points and the location of the hidden karst caves for targeted treatment. Throught application of geological radar, highdensity electrical method and shallow earthquake, the known soil caves，hidden karst caves and known collapse points have been detected. Drilling verification was carried out on the anomalies detected in Dongyanglou village and Yangxi village, and the results are in good agreement. Through analysis and research, it is regarded that GPR can better distinguish the location of shallow soil caves, shallow seismic exploration depth is large, which can more accurately distinguish the thickness of overburden and the spatial location of hidden karst caves, but the resolution of shallow soil caves is low, shallow soil caves and hidden karst caves have obvious reflection on the highdensity electrical resistivity section map, and their resolution is lower than that of geological radar and shallow karst caves earthquake. According to the advantages of different geophysical methods, combining with geological conditions of the working area, the optimization scheme of comprehensive geophysical method for detecting concealed karst has been proposed.