Fuzzy probability analysis of stability of rock mass in subsea tunnel

When we judge the stability of rock mass of tunnels by a relative ultimate displacement discrimination method,the definition of relative ultimate displacement value is very difficult.Considering this problem,a discrimination method of fuzzy probability was put forward and this method can be used for the stability evaluation of rock mass of tunnels.The stability of subsea tunnel rock mass was analyzed and calculated by regression analysis and fuzzy probability method combining with the practice of Xainmen Xiangan subsea tunnel engineering.An upper and down ultimate relative displacement was defined considering the current specifications and the deformation of subsea tunnel in different excavation parts,and the arch crown settlement time curves of CRD1 part and CRD3 part in subsea tunnel was analyzed by an exponential function.Based on the regression parameters and actual measurement results,the stability probability of the subsea tunnel rock mass was calculated and analyzed.This research gives a reference for the analysis of stability probability of the subsea tunnel rock mass by use of measured data.