PFC NUMERICAL SIMULATION OF SELF-BORING IN-SITU SHEAR PRESSUREMETER MODEL TEST

The self-boring in-situ shear pressuremeter model test is simulated by particle flow theory and PFC3D(Particle Flow Code in three Dimensions) program. Based on indoor model test, a numerical model is formed in PFC3D.The loading procedure of SBISP test is simulated. A comparison between numerical and experimental results shows reasonable agreement. The displacement development mode and mesomechanics response of soil grains around the probe are studied under complex loading conditions. The numerical results show that the displacement of particles in central area increase with the shear stress imposed stepwise, and the direction of displacement vector is more significant too. The shape of displacement vector in influence area is a reverse cone under the fifth grade shear stress. The magnitude of shear stress depends on the friction coefficient of the probe, the shear stress-shear displacement curve is no longer changes when it reaches a certain value.