超载预压加固软土路基效果数值分析

利用超载预压法处理软土地基,在确定超载预压高度与预压时间时,很少考虑软土蠕变的影响。结合武英高速公路软土路基处理工程实例,考虑软土蠕变特性,采用有限元软件ABAQUS对超载预压软土路基中超载预压高度与沉降关系、超载预压高度与超载预压时间关系进行计算,并与实测结果对比分析。结果表明,软土路基超载预压沉降分析中考虑软土蠕变是必要的,软土路基的沉降随着超载预压高度的增加而增大。在一定范围内,随着超载预压高度的增加,超载预压时间越短,但二者并非线性关系。在路基稳定的前提下,存在一个最佳的超载预压高度,使得超载预压时间最短。

Numerical analysis of surcharge preloading consolidation effects on soft foundation

The impact of soft soil creep is not considered in surcharge precompression when determining height and time of surcharge preloading. This paper calculates the settlement of soft clay by using ABAQUS considering the effect of soft soil creep on Wuhan-Yingshan Expressway soft soil subgrade project. The relationship with different heights of surcharge preloading settlement and preloading time are analyzed, then compared with the measured results, it shows that the validation of considering the creep of soft soil in settlements prediction. The settlement of soft clay will increase with the height of surcharge preloading. Within a certain range, the height of surcharge preloading increases, the time of preloading will be shorter. But nonlinear relationship exists between each other; the existence of a best height of surcharge preloading makes the time of surcharge preloading shorter in the stability of the road foundation.