摘要：A method of analyzing the stability of twin shallow tunnels was presented using both limit analysis with nonlinear failure criterion and reliability *** the condition of nonlinear failure criterion,the critical clear distancesof twin shallow tunnels were obtained by analyzing the change of surrounding pressure.A reliability model was established based on limit state equation,and the failure probability was solved by virtue of Monte Carlo *** factor and corresponding clear distance of different safety levels were obtained by introducing a target reliability *** scope of clear distance for different safety levels is described,which can be used as a supplement and improvement to the design codes of tunnels.

摘要：The reliability of post grouting pile axial resistance was studied by proposing a design method for its probabilistic limit state,which is represented by the partial coefficients of load,end,and side *** hyperbolic,modified hyperbolic,and polynomial models were employed to predict the ultimate bearing capacity of test piles that were not loaded to damage in field *** results were used for the calculation and calibration of the reliability *** reliability of the probabilistic limit state design method was verified by an engineering *** results show that the prediction results obtained from the modified hyperbolic model are closest to those obtained through the static load *** proposed corresponding values of total,side,and end resistance partial coefficients are 1.84,1.66,and 2.73 when the dead and live load partial coefficients are taken as 1.1 and 1.4,***,the corresponding partial coefficients of total,side,and end resistance are 1.70,1.56,and 2.34 when the dead and live load partial coefficients are taken as 1.2 and 1.4,respectively.