交通荷载作用下生物酶固化土路基动力特性数值模拟研究

摘要

采用数值方法分析生物酶改良土路基在汽车动荷载作用下的动力特性。研究结果表明，生物酶路基受行车荷载的影响范围不大，仅在车轮外侧约5m范围内受行车荷载的影响明显；竖向动应力随着距路基顶面的深度的增加减小很快。路基承受循环荷载时，在开始的几个循环路面的最大沉降值随时间的增加而增加，但是增加到一定程度后呈现出稳定的振动，最大沉降值不在继续增大。路基顶面的竖向速度经过几个循环后呈现出稳定的简协振动。当行车道和超车道同时承受行车荷载时，路基中竖向附加应力、沉降、竖向速度要大于只有行车道荷载的情况；最大值出现在行车道和超车道之间。%Using numerical method,it analyses the dynamic characteristics of the enzyme im-proved soil subgrade under vehicle dynamic loads.The research results show that:The vehicle load influ-ence little TerraZyme subgrade,the influence of vehicle load is obvious only about 5 m on the outside of the wheel scope.Vertical dynamic stress decreases quickly with the increase of subgrade depth.When the cyclic load effect Subgrade,the pavement maximum settlement value increases with the time in the first few cycles.but it showes stable vibration after increased to a certain degree,the maximum subsid-ence value of the pavement is not continue to increase.Vertical speed of subgrade presents stable har-monic oscillation after severalcycles.When vehicle load effects the carriageway and overtaking lane at the same time,the vertical additional stress,subsidence and vertical velocity of the subgrade is bigger than only effecting carriageway;The maximum appeared between the carriageway and the overtaking lane.