Combined Electrical Sounding Profile Method in the High-speed Railway Detecting Karst of Subgrade
The electrical sounding combined profile method was used to conduct comprehensive exploration of the karst in the subgrade of the newly built Laixi-Rongcheng High-speed Railway.The method combines the characteristics of electrical sounding and joint profiling.By measuring the electrical distribution of underground rock strata,it can accurately reflect the location and morphology of karst.It also has significant advantages such as high lateral resolution and calculable longitudinal detection depth.The overlapping position of the low-resistance depression of the electrical sounding and the crossover point of the joint profile were presumed to be the karst development area,which was suitable for the detection of subgrade karst under similar geological conditions.Detection results shows that the resistivity of DK11+352～DK11+750 segment ranges from 240 to 560 Ω·m,and the accuracy of karst detection by the electrical sounding combined profile method is 86.7%.The resistivity of DK11+750～DK12+025 segment rangs from 320 to 1 000 Ω·m,and the accuracy of karst detection by the electrical sounding combined profile method is 50%.The accuracy of comprehensive detection results of subgrade karst is 75%.The results show that the electrical sounding combined profile method has high accuracy in detecting subgrade karst,which provides a better solution for detecting karst in high-speed railway subgrade.
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