自Kjellman于1952年提出真空预压加固软地基以来，真空预压技术在加固软土地基方面得到广泛应用，但对加固机理仍然有不同的见解。本文结合工程监测资料，对天津某港口软土地基加固区的水势的变化、加固前后总应力变化以及真空卸载之后的地表沉降进行分析，得出负压固结理论可以较好的解释真空预压机理，但对卸压后地表继续沉降这一现象却无法很好解释，这一现象值得进一步探究。%Vacuum preloading reinforcement of soft base has been developed and widely used since the technique was put forward by Kjellman in 1952, but there are still various explanations for the mechanism of reinforcement. Relevant monitoring data was used to analyze the changes of water potential, total stress variation before and after consolidation, and surface settlement after vacuum unloading in a soft base reinforced zone of Tianjin port. The research results showed that negative pressure consolidation theory explained vacuum preloading mechanism well, but the theory did not support the phenomena of surface continuous settlement after unloading, which required further study.
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