柔性石笼挡墙土压力的PFC2D数值模拟

使用国际上先进的颗粒流离散元程序——PFC2D,根据工程实际情况,建立了石笼挡土墙的PFC2D模型,使其发生向内和向外两种平移模式,测量土中相应深度的土压力,对整体进行了观测和研究。结果表明,(1)墙体向外平移时,在约1 m的深度范围内,各种位移量下的应力值比较接近,在5 m深度处,各种位移量情况下几乎同时达到侧向土压力和竖向土压力的最大值。(2)墙体向内平移时,在1.5 m的深度范围内,各种位移量下的土压力值比较接近而且与深度呈严格的线性关系;在2 m处,土压力都达到了极大值,之后土压力与深度呈现出明显的非线性,逐渐减小,从而提出了主动土压力和被动土压力的深度范围。

PFC2D Numerical Simulation on Earth Stress of Flexible Gabion Retaining Wall

A new type retaining construction--gabion retaining wall is proposed.PFC2D,an advanced procedure of particle flow code,is used for generating the gabion retaining wall model according to the site situation.Then the wall moves outward or inward,at the same time,the earth pressure is measured at different depth and the wall is scanned and studied as a whole.From the above study,there are some conclusions:(1) when the wall moves outward,the earth pressure at different depth is similar in the scale of 1m depth.At 5 m depth,horizontal and vertical earth pressures of different displacement would reach the maximum value almost simultaneously.(2) when the wall moves inward,the earth pressure at different depth is similar in the scale of 1.5 m depth and the relation of pressure and depth is strictly linear.The earth pressure reaches its maximum value at 2 m depth.After this phase,the pressure gradually reduces and the relation of pressure and depth is no longer linear.From this,the depth scale of active and passive earth stress is provided.