Probability Analysis of Foundation Settlement Considering Soil Layer Thickness Variation

In order to solve the problem of uneven thickness of soil layer in the process of actual engineering settlement calculation, probability analysis method is used. By deducing the settlement mean value, variance and horizontal autocorrelation distance of the soil layer with uneven thickness, a probability model for calculating the settlement of multi-soil layer with uneven thickness is given. Then, the settlement data obtained by numerical simulation is statistically analyzed, and the optimal distribution model of foundation settlement is obtained according to K-S test. Finally, the numerical simulation results are compared with the theoretical derivation results. The results show that: In order to simplify the calculation, the improved recurrence space method should be used to obtain the horizontal correlation distance value, which can provide a theoretical basis for the selection of drilling point spacing distance. The probability model of settlement calculation is established by direct probability analysis method, and K-S test shows that the settlement data distribution model is more consistent with lognormal distribution. The settlement value predicted by the settlement distribution model is very close to the statistical value obtained by the numerical simulation, which proves the reliability of the model.