Reliability analysis of anchorage system considering mulitiple failure modes of bolts of bi-block slide
Cheng Xiao-wei · The Chinese Journal of Geological Hazard and Control · 2010
The system reliability assessment model for the anchorange system of rock slope with many rock bolts was established,based on system reliability theory and limit equilibrium method,considering many possible failure modes of the anchor itself,such as the tensile failure of the free section,the shear failure between pull rod and grouting mass,grouting mass pulled out from surrounding rock and the failure of the rock below the mat piers,etc.A direct calculated method was presented to perform the probability of failure of the anchorange system for this kind of slopes,by making use of the random sampling idea of Monte Carlo technique.Lastly,with the examples for calculations,the paper analyzed the effects of the calculation parameters on the results,and discussed the effects of the anchorage angle of anchor and the inclination of passive slider on the stability of the anchorange system,based on the median factor of safety and the failure probability index.