高速公路不同地层路基中岩溶洞穴的探测

Explore Karst in Different Strata of Highway Roadbed

采用三极与对称四极电阻率测深探测常张和邵怀高速公路路基中一定深度范围内的岩溶洞穴,沿公路走向布设多条互相平行的电测深剖面进行观测,利用各电测深剖面中电阻率ρs曲线类型的变化,确定岩溶洞穴的分布情况;利用测区内各剖面的ρs等值线断面图,结合地质条件圈定岩溶洞穴在路基中的赋存部位。通过对常张、邵怀高速公路路基的探测,确定了其地下岩层的结构构造,并判断出岩溶洞穴的埋深、规模及性质,了解了其不同地层中岩溶的电性结构的特点和分布规律。

Through the exploration in Chang-Zhang and Shao-Huai highway by using the three-pole and symmetrical four-pole resistivity sounding to explore their karsts, the distribution of the karsts, the fluctuation of the bedrock, the change of the structure and the electrical layer in different depths along the plane section was generally ascertained according to the type of the resistivity sounding ρ_s curve. Combined with the geological conditions, the mode of occurrence of the karsts in the roadbed was circled. The frame and structure of the rock layer and the depth and scale and property of the karst were ascertained.Meanwhile, the characteristic and distribution laws of the electrical frame of the karst in different strata were clearly explained.