合肥砂土盾构过程数值模拟与检验

ccording to the theory of discrete element, the numerical simulation program of shield tunneling process is written with PFC2D as the platform by diving the soil into soil particles for simulation.According to the results of laboratory triaxial test and simulated biaxial test of sand samples (Hefei sand), we set the numerical simulation parameters in order to carry out the study of surface settledsadsadsament and earth pressure of shield tunneling in Hefei and reproduce the chang Numerical simulation and Model test of shield tunneling process in Hefei cityes of soil stress and soil settlement during the shield process. The Numerical model was validated by the same size physical model.The results show that the PFC2D based on the bulk material theory can well show the settlement and stress variation of the middle section during the shield process, which provides a good numerical method for the further analysis of shield problems.