Microscopic Mechanics Of Soil Failure And PFC Numerical Simulation

In civil engineering, slope stabilization is a important problem. The field include highway, railway, dock, hydraulic engineering, mining, spoil area et. Because of the complexity of its stress and geological condition, the failure course and influencing factor of slope is hard to confirm by theoretical method accurately. Most analysis method of stability of slopes is created and developed on certain assumptions. They simplify the complex soil slopes. The reliability of the results depends on the approach extent of real condition.Traffic committee divides earth failure into five kinds: collapse, turnover, sliding, expansion, debris flow. Numerical simulation is a efficient tool and method. By Numerical simulation, we can draw the appreciation of stability, saving large quantity of human power and resource. Most numerical simulation emphasis on the sliding of earth slopes, but seldom on failure form and mechanics of the other failure categories. More important, as a complex geology, the earth slope is a discontinuous media. The mechanical property, stress condition and displacement rule vary in different place. PFC, based on the discrete element theory, was introduced to simulate the deformation of slopes, without considering constitutive relation of material, assuming slip shape, but directly defining contact relation between particles microscopic view. The calculation of PFC program is natural adjustment progress of inner material to get stabilization in slope, without satisfying displacement continuum and deformation compatibility condition. It can describe visibly the off-balance, slipping of slope, the development of the crack, and the geometric shape and position of slip plane.The shearing failure and sliding failure of earth is result from the local shear band forming and developing. The shear band has theoretical and practical meaning to ground bearing capacity, earth slope, earth-retaining wall, pile driving and excavation engineering. Thus the study of soil failure mechanics relied on to the development of shear band. The particle flow code (PFC) theory is introduced and the particle flow numerical simulating method is developed in the paper. PFC is not restricted by the...