Abstract：The high-terrace folk house in Kashgar has a widely distribution of tunnels and underground storage space under the building, which bring a great incipient danger to the stability of the building and the slope. Two typical incipient dangerous working conditions of tunnel stability are studied with RFPA, considering collapsible loess mechanical-property of heterogeneous distribution characteristics. The tunnel failure processes are simulated with AE to intuitively describe the dynamic evolution of soil mesoscopic damage, fracture extension, fracture surface formation, and partial as well as overall failure. The maximum risk and critical conditions of the two kinds of working conditions are obtained. In view of the complexity and difficulty of the tunnels backfill work in Kashgar, two feasible suggestions are put forward.

Keyword：high-terrace folk house;tunnel;safety incipient danger;RFPA;stability analysis;