Before the engineering design and construction of highway tunnels, it is necessary to carry out detailed investigations on the geographical layer distribution, dysplasia structural conditions, groundwater and other geological conditions in the engineering region, which can provide security for the engineering construction and service of the project. High-density electric method is an array type rapid exploration method. It has the advantages of measuring points easily setting, automatic data acquisition, rich information interpretation, short survey period and low cost. After more than 30 years of development and application, it is widely used and effective in engineering survey field. With the using AGI high-density resistivity imaging system, the geological conditions and poor structures of the Pine Mountain tunnel project of the 108 National Highway in the Jingxi Mountainous Area were investigated and implemented, and a variety of measuring devices were selected for comparative testing and data inversion analysis. By comparing the test results with the geological data and the situation on the site, it is inferred that more accurate information on stratigraphic structure and abnormal body distribution can make up for the serious shortage of engineering geological drilling points.
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