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本文从加固机理出发,根据工程现场的监测数据对预压期间各土层的沉降、侧向位移、孔隙水压力进行分析,前期真空预压时沉降主要发生在淤泥层,后期加上堆载后填土层沉降较大,淤泥层发生蠕变现象。判断其与竖向荷载大小、层间土弹性模量比及软弱层的厚度有关。另外,由于水压消散值的测定受真空和堆载联合作用而随时间变化较复杂,推荐用沉降量推算固结度。
Based on the monitoring data of the construction site, this paper analyzes the settlement, lateral displacement and pore water pressure of each soil layer during the preloading period. The settlement mainly occurs in the silt layer during the pre-vacuum preloading, Fill layer sedimentation larger silt layer creep phenomenon. Determine the vertical load size, soil elastic modulus ratio and the thickness of the weak layer. In addition, since the determination of water pressure dissipation is complicated by the combined effects of vacuum and stowage over time, it is recommended to calculate the degree of consolidation by the amount of settlement.