Fault Identification based on the Fusion of Multiple Traditional Methods
Fault identification is crucial to the prevention and control of geological disasters and the construction and maintenance of large-scale projects.In this paper,taking the reservoir fault F1 under a pumped storage power station project in Shaanxi Province as an exam-ple,the development characteristics and spatial distribution characteristics of the fault are comprehensively inferred by means of adit sur-vey,geomorphological analysis,borehole analysis,geophysical analysis,mathematical calculation,etc.The results show that through the adit survey,the F1 fault is filled with fault mud about 35 cm thick,and the upper wall occurrence is N45°W,SW∠65°～75°,and the lower wall occurrence is N80°W,SW∠50°～55°;Due to in-situ stress,the upper wall rock mass is broken.Through the analysis of ge-omorphological characteristics,the integrity of the rock mass in the lower wall of the fault is good,the rock mass in the upper wall is bro-ken,the surface outcropping is dominated by fragmentation structure,and the hidden micro-fractures in the rock block are extremely de-veloped.Through geophysical analysis,it is concluded that the strike of the F1 fault is NE40°～69°SE∠65°～75°,the extension length is more than 20 km,and the fault width is 10～20 m.The spatial distribution characteristics of fault F1 are comprehensively inferred through geomorphological feature analysis,geophysical analysis,borehole analysis,mathematical calculation and analysis.The compre-hensive fault identification method in this study can provide reference for fault identification of large-scale hydropower projects.
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