条形埋置基础固结分析计算图表

基于比奥固结理论，用有限元方法研究了有限饱和土层中条形埋置基础的固结沉降特性。仔细分析了影响固结度的3个参数：基础埋深与土层厚度的比值；土层厚度与基础宽度的比值；土骨架的泊松比。根据分析结果，提出了归一化无量纲时间，并给出了计算条形埋置基础固结度的计算图表。这些图表为基础设计提供了便捷准确的计算方法。运用文中图表计算固结度的最大误差不超过3 %。

Solution charts for consolidation analysis of strip footings embedded in a finite stratum

The finite element method is used to investigate the consolidation behaviour of strip footings embedded in a finite stratum based on Biot’s consolidation theory. The calculation is carried out using a well-known finite element software, ABAQUS. The influences of three factors: (1) the ratio of buried depth to the thickness of the stratum, (2) the ratio of footing width to the thickness of the stratum, (3) the Poisson’s ratio of the soil skeleton on the average degree of consolidation settlement have been examined. Based on the results of analysis, a new normalized dimensionless time is suggested. Solution charts for determining the average degree of consolidation settlement of strip footings embedded in a finite stratum are presented. The charts can provide engineers with a quick answer to the design issues. The maximum error caused by using the solution charts is within 3 %.