吹填土物理力学参数的多重相关性研究

Study on multi-correlation of physical and mechanical parameters of dredged filler

土体特性的物理力学参数之间的相关关系不能用简单相关系数来表征,在物理力学参数样本容量不足的情况下,采用偏相关系数能很好地评价变量之间的多重相关性。沿海城镇围海造陆工程中高含水量的吹填土,现场取样困难,获取物理力学参数样本容量极其稀少,采用偏相关系数能准确地度量参数之间的多重相关性。基于最小二乘法回归理论,引入偏相关系数度量吹填土物理力学参数之间的相关关系。实例分析结果表明,偏相关系数与简单相关系数有较大差别,这是由于多变量相互影响的结果,多重相关性分析为吹填土小样本物理力学参数预测模型建立及参数信息优化筛选提供一种有效方法。

The relationship of physical and mechanical parameters of soil masses can not be reflected by simple correlation,and the multi-correlation among variables can be evaluated by partial correlation coefficient if the samples of physical and mechanical parameters are insufficient.The in-site sampling of high water content dredged filler of land reclamation projects in coastal towns is difficult,so the obtained samples reflecting physical and mechanical parameters are rare.The partial correlation coefficient is adopted to accurately measure the multi-correlation among the variables.Based on least squares regression theory,the method of partial correlation coefficient is introduced to measure the relationship of physical and mechanical parameters of dredged filler.The results show that,due to the interactive relations of multi-variables,there is a significant difference between partial and simple correlation coefficient.Analysis on multi-correlation will provide an effective method for establishing forecasting model and optimization screening of physical and mechanical parameters.