Aiming at the problem of non-limit active earth pressure of sand during active displacement of rigid retaining wall,the ac-tive failure process of sand under rotating about the base(RB)mode,rotating about the top(RT)mode and translation(T)mode was simulated and analyzed by using PFC2D.The results show that there are differences in the mobilization of internal friction angle and the soil-wall interface friction angle in soil under different displacement modes.During the active displacement of the retaining wall,the soil failure in RB mode starts from the top of the wall and develops to the foot of the wall.Only the area near the back of the wall appears the principal stress deflection in the soil wedge,and the mobilized value of the internal friction angle in the soil wedge can reach the limit value.In RT mode,the soil failure starts from the foot of the wall to the soil surface along the back of the wall and the sliding surface.The deflection angle of the principal stress in the middle and upper part of the soil wedge behind the wall is large,forming a large princi-pal stress arch,which corresponds to the reduction of the mobilized value of the friction angle in this area relative to the initial internal friction angle.In T mode,the soil failure develops from the top of the wall to the foot of the wall along the back of the wall and from the foot of the wall to the surface of the soil along the slip surface.A small principal stress arch appears in the soil wedge behind the wall,and the mobilized value of the internal friction angle increases from the initial internal friction angle,but it does not reach the limit value.
关键词
非极限主动状态/离散元模拟/土压力/墙土摩擦角/土拱效应
Key words
non-limit active state/discrete element simulation/earth pressure/soil-wall friction angle/soil arching effect
维普
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