分层真空预压提高吹填土地基固结效率的模型试验研究

摘要

采用真空预压法处理吹填土地基是目前较为常见的一种方法,由于吹填土地基吹填厚度较大、真空度向下传递过程中衰减较快、孔隙水压力消散过慢等原因,导致地基深部位置的土体固结效果差、预压工期较长、施工成本较高等问题出现.针对以上问题,结合吹填土地基施工的特殊性,对分层真空预压进行探讨.通过建立相关室内模型试验,对比了分层真空预压与普通真空预压在土体沉降速率、真空度的传递衰减、土体的抗剪强度等参数,进而探究了分层真空预压对吹填土地基进行处理的效果,并且分析了影响处理效果的因素.%Vacuum preloading is a common method that used to deal with hydraulic fill foundation.The soil consolidation effect in deep location of foundation is poor,the period of vacuum preloading is long and the construction cost is higher because the hydraulic soil foundation is usually thicker,vacuum degree decays rapidly in the process of passing down and the dissipation of pore water pressure is too slow.Aiming at the above problems and combining with the particularity of hydraulic fill foundation construction,layered vacuum preloading is discussed.It compared the parameters of soil sedimentation rate,attenuation of vacuum degree and the shear strength of soil between the layered vacuum preloading method and ordinary vacuum preloading method,to explore the treatment effect of the hydraulic fill soil foundation by the layered vacuum preloading method and analyze the factors affecting treatment effects of the hydraulic soil foundation.