Numerical Simulation Study on Compression Characteristics of Gravelly Soil Mixture Based on Soft Servo Method

Because of complex mechanical properties and deformation mechanism, gravel soil mixture is an important medium concern in the field geotechnical engineering. Based on continuous-discontinuous coupling algorithm formed by structure shell elements particle discrete element method (PFC3D), soft servo loading sample realized, typical triaxial compression test data are used to calibrate mesoscale parameters. Furthermore, numerical tests under different rock contents confining pressure carried out. The change rule shear strength mixed discussed. It shows that achieves a good effect reflecting process. Under mechanism flexible servo, failure mode takes drum-failure mode, internal damaged forms obvious asymmetric X-shaped band. With increase stone content, friction angle cohesive force distribution have certain discreteness, but whole, with content. results can provide reference for parameter determination mediums such as soil.