Deformation reliability analysis of subway deep foundation pit under complex environment
In order to calculate the deformation reliability of subway deep foundation pit under complex environment,a non-intrusive stochastic finite difference method was proposed.By constructing a stochastic finite difference interface,the deterministic analysis and stochastic analysis were integrated.The Hermite random polynomial was introduced to determine the explicit function expressions of three output responses and 12 input variables,and the deformation reliability of foundation pit was calculated.The results show that the calculation accuracy of the non-intrusive stochastic finite difference method is similar to that of the Monte Carlo method,but the calculation efficiency is much higher than that of the Monte Carlo method.The feasibility of the non-intrusive stochastic finite difference method is verified by the calculation results.According to the correlation strength between the output response and the input variable,the density of sand layer has a great influence on the reliability of foundation pit deformation.The coefficient of variation of sand density Cov(ρ3)is set to 2 times of the initial value,the influence of the variability of sand density on the output response is verified,and the failure probability of surface settlement and horizontal displacement of retaining structure is obviously improved.In order to improve the deformation reliability of deep foundation pit,more samples should be collected before determining the coefficient of variation of soil parameters to ensure that the soil density is closer to the real value.
deep foundation pitstochastic finite difference methoddeformationreliabilitysoil parameter variability
万方数据
维普
