天津滨海新区粘性土物理力学性质指标相关性

在岩土工程中,土性参数的选取至关重要。笔者对天津临港地区多个钻孔取样所得土工试验数据的统计规律做了深入分析,并结合传统的回归分析方法客观、详细地研究了滨海新区粘性土物性指标之间及其与力学指标间的相关关系,给出了指标之间的经验关系式,并给出相关系数用于评价相关程度。结果表明,物性指标之间相关性都较好,相关系数可达到0.94以上;物性指标与变形指标之间的相关性分析结果表明,孔隙比、含水率、密度等指标与变形指标的相关性都较好,相比之下含水率与变形指标间的相关性最好,相关系数在0.93以上;物性指标与不同试验方法得到的强度指标之间的相关性分析结果表明,孔隙比、含水率、密度等物性指标与强度指标之间的相关关系较好,相关系数在0.81~0.94之间;文中成果可为该地区资料欠缺的工程提供参考。

Correlation Analysis on Physico-mechanical Properties of Clayey Soil in Binhai New Area in Tianjin

It’s of vital importance to know properties of clayey soil in geotechnical engineering. Correlation analysis among physical and mechanical properties of clayey soil based on test data from Tianjin Lingang were carried out, and empirical formulas were also successfully put forward. Results show that, correlation coefficients in correlation analysis among physical properties are more than 0.94, indicating a good relevance. In addition, correlation analysis between physical parameters and formation indexes are also performed, and high correlation coefficients show good relevance between void ratio, water content, density and formation indexes, and relevance between water content and formation index is specially good, with correlation coefficients more than 0.93. Correlation between physical parameters and strength indexes are assessed as well, and there is a good relevance between void ratio, water content, density and strength indexes, with correlation coefficients from 0.81 to 0.94. Empirical formulas put forward in the paper can be reference for parameter selection in case of engineering design lack of materials about subsoil.