真空预压地基沉降计算方法研究

采用单井地基等效圆内真空压力的平均值等效代替群井地基内部真空压力的平均值推求在K0固结条件下地基沉降计算方法。在原有考虑土体侧向变形（非K0固结）的地基沉降计算方法的基础上对体积应变修正系数进行了新的考虑与分析，提出平均体积应变系数的概念，认为考虑侧向位移的固结沉降应采用平均体积应变系数对公式进行修正。进行有限元计算分析，将理论计算值、有限元计算值、实测值三者进行比较分析，认为计算值合理、可靠。采用真空预压沉降计算方法进行沉降预测较为合理便捷，对真空预压设计有一定的指导和借鉴作用。

Research on Simplified Method to Calculate Foundation Settlement with Vacuum Preloading Method

The average of vacuum pressure using the equivalent circle of single well foundation, instead of the average of vacuum pressure of mul ti-boreholes, was applied to specify the method to calculate foundation settlement under k_0 consolidation condition. Founding on the advanced method considering soil lateral displacement to calculate foundation settlement, the paper took new consideration and analysis with the modify coefficient in volumetric strain, and specified the concepts upon the coefficient of average volume stress, also firmly believed that the consolidation settlement considering soil lateral displacement should modify formula by applying the method ofaverage volume strain. Proceeding from finite element analysis, this paper made a comparison between the result of theory analysis, FEM calculation and surveillance. And the result was reasonable and reliable It was more Reasonable and convenient to apply the method to forecast foundation settlement and it can be a reference to the generalization and application of the designs of vacuum preloading method.