真空联合堆载预压与堆载预压软土地基加固对比研究

软土地基含水量高、压缩性大、渗透性差、强度低，在其上修建高速公路，将会遇到沉降、水平位移等问题。为此，采用真空联合堆载预压与堆载预压两种方法加固深厚软土地基，通过现场对比试验，以及对弹塑性模型、粘弹塑性模型、粘弹塑性损伤模型进行对比分析。结果表明，真空联合堆载预压相对堆载预压来说，提高了加荷速率、缩短了工期、减少了工后沉降，效果显著，粘弹塑性损伤模型模拟值最接近于实际值。

Comparative Research on Soft Soil Foundation Reinforcement by Vacuum-surcharge Preloading and Surcharge Preloading

Soft soil foundation is of high water content,large compressibility,poor penetrability and low strength so that expressway built on this foundation will lead to settlement and horizontal displacement and other troubles.Therefore,vacuum-surcharge preloading and surcharge preloading are adopted to reinforce deep soft soil foundation and the on-site comparision test and the contradistinctive analysis on elastic-plastic model,visco-elastoplastic model and visco-elastoplastic damage model are carried out.The results show that comparing to surcharge preloading,vacuum-surcharge preloading will increase loading rate,shorten construction period,and reduced post-construction settlement significantly and the analog value of visco-elastoplastic damage model is most close to the true value.