This paper introduces the general situation of the geological structure in the area for construction purpose,and expounds two methods for geotechnical engineering investigation,such as shallow earthquake and resistivity CT exploration.

On the basis,it analyzed the development process,parameters,the installation methods,data-processing algorithms and chromatography of the electromagnetic CT,high-density resistivity CT,sonic CT,earthquake CT and optical CT of dam detection and investigation.

Test of Investigating Concealed Trouble of Sea Dyke Using Resistivity Method at Qiantang River;

Presently,conventional methods of prospecting height of the water flowing fractured zone are the method of drilling fluid consumption,the method of pouring water into borehole,resistivity method and seismic prospecting method.

The basic principle of resistivity imaging method is the same with that of DC resistivity method, but the field survey of resistivity imaging method is carried out with matrix methods.

New method for testing contaminated soil——electrical resistivity method;

Because after high-concentration and multi-component landfill leachate soak into underground, underground media’s conductibility will change, electrical resistivity method is becoming an important means in investigating areas polluted by leachate and monitoring the process of pollution.