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为深入了解无砂垫层真空预压技术加固新近吹填淤泥地基过程中的负压传递特性和分布模式,依托珠海港高栏港区某新近吹填淤泥地基处理工程开展了现场试验研究,研究结果表明:(1)土工合成材料水平排水垫层中的负压损失程度较严重,至少为16%;整个排水系统内的负压损失程度也较严重,最严重的高达57%。(2)不同深度处土体中的负压传递特性一定程度上受相应位置处淤泥自重沉积规律的影响,粗颗粒含量高的深度位置,其负压衰减程度相应较低;但总体来讲,负压从竖井向土体传递过程中的损失程度很严重,至少67%,这是新近吹填淤泥地基经无砂垫层真空预压技术加固后土体强度增长有限的主要原因。最后,明确给出了该类地基的负压分布模式:水平排水垫层中的负压可考虑为随时间变化的线性衰减模式,而竖向排水体中的负压可考虑为随时间变化的非线性衰减模式。
In order to further understand the negative pressure transmission characteristics and distribution patterns of the newly-built sludge-free silt foundation under vacuum preloading technology without sand cushion, a field experiment was conducted based on a newly-treated muddy foundation treatment project in Gaolan Port, Zhuhai Port. The results show that: (1) The degree of negative pressure loss in horizontal drainage cushion of geosynthetics is more serious, which is at least 16%. The negative pressure loss in the whole drainage system is also serious, the most serious is 57%. (2) The negative pressure transfer characteristics of soils at different depths are affected to some extent by the sludge self-weight deposition law at corresponding positions. The depth of coarse particles with a relatively low degree of negative pressure decay is correspondingly lower; however, on the whole, The negative pressure loss from the shaft to soil is very serious, at least 67%. This is the main reason for the limited increase of soil strength after the newly-filled silt foundation is reinforced by the vacuum pre-compression technology of non-sand cushion. Finally, the negative pressure distribution pattern of the foundation is clearly given: the negative pressure in the horizontal drainage cushion can be considered as a linear attenuation model with time, and the negative pressure in the vertical drainage body can be considered as time-varying Non-linear attenuation mode.