岩溶在地质雷达图象和等ρ_s断面图上的反映特征

THE REFLEXION FEATURE OF KARST ON GEOLOGICAL RADAR IMAGE AND EQUAL -ρ_s SECTIONAL DRAWING

南宁～昆明铁路共进行了238公里的路基、隧道、车站、桥址的岩溶综合物探,依据物探结果,进行了三千五百多个钻孔的注浆整治工作。本文根据注浆钻孔结果,将岩溶按其性质不同,分为充填型溶洞、空洞和溶孔、溶隙、溶蚀破碎区三大类,根据各类岩溶的物性特征不同,又划为九个分类。通过典型的、具有代表性的实例分析,说明了各类岩溶的电阻率地质雷达信号异常特征和规律。

In Nanning-Kunming Railway, the comprehensive geophysical prospecting works have done on subgrades, stations, tunnels, bridges locations, which are 238km long in total. More than 3500 drill holes have been renovated with grouting according to the geophysical prospecting. In this paper, after analysing the effects about renovated drill holes, the writer divides karsts into three classifications, which are filled karst, cave and solution opening, solution crack and corrosion fracture area, according to the characters of karst. In addition, the karsts can be divided into nine subclasses according to physical features of karsts. In this parper, after analysing the typical representative cases, the writer states the electrical resistivities of various karsts, the anomalous features and regularity of karsts in geological radar images.