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通过对某上覆欠固结吹填粉细砂土深厚软土地基真空预压中真空压力传递和衰减、超静孔隙水压增长和消散、地基表面沉降、土体分层沉降变形特性和规律的分析,研究上覆欠固结吹填粉细砂土层对真空预压软基固结变形的影响。欠固结吹填粉细砂土层有利于下卧深厚软基的排水消压,地基沉降前期快、波动大,中后期收敛稳定快。膜下真空压力表面传递的差异性和波动性较大,向地基深处传递的滞后性和衰减幅度较大。欠固结吹填粉细砂土压缩量较大,吸收了大部分的真空能量,不利于下卧深厚软基的压缩变形。处理后欠固结吹填土的加固效果明显好于下卧软基土体。
Through the vacuum preloading and pressure reduction of overpressure, the growth and dissipation of excess pore water pressure, the settlement of foundation surface and the delamination and delamination deformation of soil, The influence of the overlying underfill consolidation silty sand layer on consolidation consolidation deformation of vacuum preloading was studied. The under-consolidation blow-fill fine sand soil layer is conducive to the drainage of deep soft foundation under pressure, the foundation settlement early, volatility, convergence in the late fast. The difference and volatility of vacuum pressure surface transmission under the membrane are large, and the lag and attenuation amplitude transmitted to the deep foundation are large. Underconsolidation fill a large amount of sand powder compact compression of large, absorbing most of the vacuum energy is not conducive to the next deep soft foundation compression deformation. After consolidation, the consolidation effect of under consolidation consolidation is obviously better than under foundation.