有无侧限条件下公路软基堆载预压对比研究

为降低堆载预压排水固结对周边环境的不利影响,提出了侧限堆载预压控制技术。基于FLAC3D有限元分析软件建立有无侧限堆载预压排水固结模型,将无侧限堆载预压模拟结果与实测结果进行对比,验证了数值模拟模型的合理性与可行性,探讨了有无侧限堆载预压的差异。研究结果表明:侧限控制技术能有效降低软土地基沉降、加快前期固结速率;同时侧限位置离堆载预压区边缘越近,侧限效果越好。

A Comparative Study on the Surcharge Preloading of Highway Soft Foundation with the Lateral Restraint a Variable

In order to reduce the adverse effects of the preloading drainage consolidation on the surrounding environment, the concept of the lateral restraint of the surcharge preloading has been put forward. A preloading drainage consolidation model with the lateral restraint a variable has been established by using the finite element analysis software FLAC3D, followed by a comparison between the simulation results and the measured results of the surcharge preloading without the lateral restraint, which has verified the liability and feasibility of the numerical simulation model. An investigation has been made of the differences between the surcharge preloading with or without the lateral restraint. Experimental results show that the controlling of the lateral restraint helps to effectively reduce the settlement of the soft soil foundation and speed up the initial consolidation rate. Meanwhile the closer the position of the lateral restraint to the edge of the surcharge preloading area, the better the lateral confinement effect will be.