真空联合堆载预压处理高速铁路软土地基效果检验

Effect of Treating Soft Soil Foundation of High-speed Railway with Vacuum-mound Preloading Method

研究目的:在软土地基上修建高速铁路时,由于高速铁路的工后沉降要求严格,不进行软土地基处理往往不能满足高速铁路工后沉降的控制要求。软土地基处理的方法较多,不同处理方法的适用范围、处理费用、处理效果、工期是不同的。如何经济合理地进行高速铁路软土地基处理,是高速铁路建设中面临的重大课题,通过本研究,拟找到一种适合高速铁路软土地基处理的方法。研究结论:采用真空联合堆载预压处理高速铁路软土地基具有经济性好、工期较短、充分利用路堤荷载等优点,适合在铁路软土地基处理中推广应用。采用该方法处理后,土体的物理力学指标得到了明显的改善,加固效果明显。应注意真空联合堆载预压对周围土体的影响,防止因侧向位移而开裂以及产生附加的不均匀沉降。由于真空预压工艺较复杂,选择合理的设计和施工参数是至关重要的。

Research purposes： In order to meet the high standard of post construction settlement of high - speed railway, soft soil foundation must be treated. There are many methods to treat soft soil foundation with different applicable scopes, engineering costs, effects and construction period, so it is necessary to do researches on these methods for the purpose of finding out a suitable method for treating the soft soil foundation of high - speed railway. Research conclusions： Vacuum - mound preloading is a suitable method for treating soft soil foundation of high - speed railway with the characteristics of low cost, short construction period and making full use of embankment load, etc.. The physical- mechanical properties of soft soil are improved much after consolidation with this method. However, when using this method, the attention should be paid to the influence of vacuum - mound preloading on the soft soil around, and to preventing the crack caused by the displacement and additional differential settlement. It is important to choose reasonable design and construction parameters while using this method because of its complex techniques.