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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。
The use of overloading preloading method for the treatment of soft ground, in determining the overload preloading height and preloading time, rarely consider the impact of soft soil creep. Considering the creep characteristics of soft soil, the finite element software ABAQUS was used to analyze the relationship between overloading preloading height and subsidence, the relationship between overloading preloading height and overload preloading time in soft soil subgrade with Wuyin expressway. Calculated, and compared with the measured results. The results show that it is necessary to consider the creep of soft soil in the analysis of soft soil subgrade overloading and preloading. The settlement of soft soil subgrade increases with the increase of preloading height. Within a certain range, as the overload preloading height increases, the overload preload time is shorter, but the two are not linear. Under the precondition of roadbed stability, there is an optimal overload preloading height, which makes the overload preloading time shortest.