【作者】 尚彦军； 王思敬； 岳中琦；

【Author】 Shang Yanjun

【机构】 中国科学院地质与地球物理研究所； 香港大学土木工程系；

【摘要】 对全风化花岗岩原状土结构的两大主要组分:孔隙和颗粒的各自分布特征进行过大量研究。而对两者特征指标间相关性研究结果和报道很少见到。利用压汞法对38个样品孔隙分布特征、颗分法对23个样品粒度分布特征测试,并对这23个样品孔隙和颗粒分布特征指标进行了相关性分析。分析中采用了一元回归分析法和多因素相互作用关系矩阵法,对9个主要结构指标建立了相互关系矩阵。进一步地给出了各因素(指标)在土结构中所起的作用和比重(权重)。结果发现它们中作用比较突出的依次是:中值粒径(D50)、孔径不均匀系数(Cu(?))、平均粒径(Dm)、中值孔径(R50)和孔径分布曲率系数(Cc(?))等。而通常为工程所用的孔隙度就结构本身研究而言,在结构特征指标中作用并不很明显。更多还原

【Abstract】 A lot of researches have been carried out on two components with respect to microstructures of undisturbed completely decomposed granite:pore size and particle size distributions.While it is seldom seen researches on the interaction of the two factors in aspect of microstructure.Mercury injection technique has been adopted to test the pore size distribution on 38 nos.samples.Particle size distribution of 23 nos.samples is tested by means of sieves and sedimentation tubes.For the 23 nos.samples,the interaction of featured parameters of microstructures in view of pore size and particle size distributions is studied.In this study,approaches of regression analysis on one variant,and of interaction matrix are adopted.The 9 parameters are listed along the main diagnoal of the square matrix.The interrelation curves are showed in the right upper part,and the correlation equations and coefficients are listed in the left lower part of the matrix.Then,after calculation on the coefficients,values of the relative importance (or weight ratio)of the parameters are gained.By comparison,it is found that parameters with more important influences on microstructural features are in a sequence of:median of particle diameter(D50), coefficient of Uniformity of pore size(Cu’),average of particle size(Dm),median of pore size(R50) and coefficient of curvature of pore size(Cc’).While the porosity is not so important in microstructural characters as it is in engineering practice,which is applied more often.更多还原