Verification for Fault Stability by In-Situ Stress Test

In order to verify the fault stability of a tunnel in Fujian, hydro-fracturing in-situ stress measurement was conducted. The test revealed the stress magnitude and the maximum horizontal principal stress direction in testing area, which have obvious similarity with other results in intact rock mass. According to the horizontal stress distribution relationship with depth, two points’ stress state represent the fault was calculated. At last, based on the selected sliding criterion, the stability of faults was verified in this paper.