关键词: 新近吹填淤泥地基, 无砂垫层真空预压技术, 负压传递特性, 负压分布模式

Abstract: To deeply know transfer properties and distribution model of negative pressure in fresh hydraulic reclamation muck foundation in the process of vacuum preloading technology with no-sand horizontal drainage cushion, based on a similar project in Gaolan Seaport Area in Zhuhai Seaport, a field experiment research was carried out. The research results show that: (1) Vacuum negative pressure reduced by at least 16% in the process of transferring to horizontal drainage cushion, and reduced by up to 57% in the process of transferring to the bottom of vertical drains. (2) For transfer properties of vacuum negative pressure in different depths, to a certain extent, it depends on dead weight sedimentation behavior of soils in different depths. The higher the content of coarse particles in certain depth is, the less the loss of vacuum negative pressure in corresponding depth is. But on the whole, the loss of vacuum negative pressure in the transfer path from vertical drains to soil is very serious, at least 67%, which is the main reason why soils strength is increased only a little after improved by no-sand vacuum preloading technology (NSVPT). At last, it is put forward that the distribution model of vacuum negative pressure. It is time-varying linear attenuation model when transferring in the horizontal drainage cushion; but it is time-varying nonlinear attenuation model when transferring in the vertical drains, depending on the site condition.

Key words: fresh hydraulic reclamation muck foundation, no-sand vacuum preloading technology (NSVPT), transfer properties of vacuum negative pressure, distribution model of vacuum negative pressure