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

发布时间：2019-03-16 21:41

【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5 m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。
[Abstract]:A numerical method is used to analyze the dynamic characteristics of bio-enzyme-modified soil roadbed under vehicle dynamic load. The results show that the bio-enzyme roadbed is not affected by the driving load, but only within about 5 m outside of the wheel, and the vertical dynamic stress decreases rapidly with the increase of the depth to the top of the roadbed. When the roadbed is subjected to cyclic load, the maximum settlement value increases with the increase of time, but after increasing to a certain extent, it shows stable vibration, and the maximum settlement value does not continue to increase. After several cycles, the vertical velocity of the top surface of the roadbed presents a stable simple and co-vibration. When the carriageway and the overpass lane are subjected to the driving load at the same time, the vertical additional stress, settlement and vertical velocity of the roadbed are greater than that of the only carriageway load, and the maximum value appears between the travelling lane and the overpass lane.
【作者单位】：湖南省炎汝高速公路建设开发有限公司;湖南省交通科学研究院;
【基金】：湖南省科技重大专项(2010FJ1008)
【分类号】：U416.1

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