真空预压加固地基等效固结理论计算分析

摘 要：目前PVD地基固结解析解求解过程复杂且参数繁多。利用平均固结度等效概念，并考虑井阻和涂抹效应，将PVD地基等效为天然地基，针对真空预压特点，考虑了地表孔压随抽真空过程的变化，求出其一维固结解析解。根据所给出解，编制了程序，绘制了涂抹作用和PVD排水量对固结影响曲线图，并与有限单元法及现场实测数据进行对比。研究表明，所给出解与现有解、有限单元法和实测数据比较接近，且表达形式较为简单，适合于工程应用。

Calculation and Analysis of Equivalent Consolidation Theory of Ground in Vacuum Preloading

Abstract: At present time, most analytical solutions of consolidation of PVD ground are very difficult to be gained and too many parameters are involved during the solving course. Taking drain resistance and smear zone effects into account, the PVD ground is turned into natural foundation based on the equivalent consolidation degree. In terms of vacuum preloading, analytical solution of one-dimensional consolidation is worked out, which considers the variation of pore-water pressure on ground surface with vacuum-pumping. According to this solution, the program is implemented. The influence of smear zone and the drainage capacity of PVD on consolidation process are investigated and the relevant results are showed in graph forms; and this solution is compared with the existing solution, FEM and in site data. It is shown that the calculated results of this solution is comparable to that of the existing solution and FEM, and its form is more simple, which can meet the requirements of project.