Reliability analysis of stability of foundation pit supported by prestressed anchor composite soil nailing

Considering the effect of prestressed anchor, the performance function of reliability analysis for inner global stability of foundation pit supported by prestressed anchor composite soil nailing is set up using the slope limit equilibrium theory and the circular sliding surface method. The calculating model of the most dangerous sliding surface for inner global stability of foundation pit is established with disturbing force method, and the searching method of the most dangerous sliding surface is optimized with the SLP optimization method . Then with the shear strength indexes of soil as random variables, the reliability index of inner global stability of foundation pit is calculated with the design checking point method. Finally, a practical project is used to analyze the sensitivity of the reliability index to the coefficients of variability of all random variables.