Application Research of Electromagnetic Method in Detecting Deep Structure of the Preselected Site Rock Mass

The development of Chinaʹs nuclear industry, the energy shortage got a certain degree relief, but it also brought a lot of high-level radioactive nuclear waste, which done a lot of harm to the environment and human body, building underground repository was a safe and effective approach to dispose nuclear waste. In order to detect the deep fault structure, spatial patterns of granite rock mass in the preselected site, we used high frequency electromagnetic system(EH4) to measure the preselected site with a long profile, understood the electrical changing characters and fought out spatial patterns of rock and the strike, tilt angle and outspread condition. The result indicated the resistivity was more than 800 Ωm granite area, but less than 500 Ωm deep fault structure. It exist obvious differences between them and we could detect the character of the deep fault structure and spatial patterns of rock, and it provided a reference for stability and integrity of high-level radioactive waste repository site assessment.