| 李小勇.砂井地基固结概率设计的简化分析方法[J].水利学报,2002,33(8):0073-0082 |
| 砂井地基固结概率设计的简化分析方法 |
| Approximate probabilistic design method of sand-drained foundation consolidation |
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| DOI： |
| 中文关键词: 砂井地基 固结 固结系数 概率分布 概率设计 |
| 英文关键词: sand-drained foundation consolidation consolidation coefficient probability distribution probabilistic design |
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| 中文摘要: |
| 根据工程地质勘察资料, 统计分析了固结系数的空间概率特征. 利用两点概率理论, 探讨了竖向固结系数与水平向固结系数间的互相关性对砂井地基固结的影响, 并分别研究了竖向固结、径向固结和砂井地基固结对固结系数不确定性的敏感性. 竖向固结系数与水平向固结系数间的互相关性对砂井地基固结的概率特性有一定程度的影响. 竖向固结和径向固结的概率特性对固结系数分布类型的敏感性随着固结系数变异性的增加而随之增加. 砂井地基固结的概率特性对于水平向固结系数的不确定性比较敏感 而对于竖向固结系数的不确定性不敏感. 基于参数的敏感性分析, 提出了砂井地基固结概率设计的简化分析方法. 该方法忽略竖向固结系数不确定性的影响, 而仅考虑水平向固结系数的不确定性及其分布影响. 为便于工程应用, 提供了设计图表. |
| 英文摘要: |
| The spatial probabilistic characteristics of the coefficients of consolidation were statistically analyzed according to the engineering geologic investigation data. Based on the principle of two-point estimation for probability, the effects of correlation between the vertical coefficient and horizontal coefficient of consolidation on sand-drained foundation are studied. Furthermore, the effects of vertical consolidation, radial consolidation and sand-drained foundation on the sensitivity of uncertainty are investigated. It is found that the correlation between the vertical and horizontal coefficients has certain influence on probabilistic characteristics of consolidation of sand-drained foundation. The probabilistic characteristics of consolidation of sand-drained foundation are highly sensitive to the uncertainty of horizontal consolidation coefficient, but they are not sensitive to the uncertainty of vertical consolidation coefficient. On this basis, a simplified analysis method for probabilistic design of sand-drained foundation is suggested. |
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