化学成分对红黏土界限含水率的影响

为研究桂林地区红黏土中化学成分Fe₂O₃、Al₂O₃、SiO₂含量对其界限含水率的影响,分别采用蒸馏水和乙二胺四乙酸二钠(EDTA二钠)浸泡红黏土土样,对不同浸泡时间的土样进行化学成分XRF测定,同时进行界限含水率测试和比重试验。通过回归分析和路径分析,建立了以Fe₂O₃、Al₂O₃、SiO₂含量为变量的红黏土界限含水率和相对密度的非线性回归模型,红黏土液限与塑限之间、塑性指数与液限之间以及相对密度与塑限之间的线性回归模型,红黏土Fe₂O₃、Al₂O₃、SiO₂含量与液限、塑限、塑性指数和相对密度之间的路径模型,并分析了化学成分对红黏土界限含水率的影响。

Influences of Chemical Compositions on Limit Moisture Content of Red Clay

In order to study the influence of Fe₂O₃,Al₂O₃ and SiO₂ contents on the critical moisture content of red clay,the red clay samples are soaked in distilled water and EDTA disodium respectively,and the chemical composition of the soil samples with different soaking time is determined by XRF,and at the same time,the critical moisture content and specific gravity test are carried out.Through regression analysis and path analysis,the nonlinear regression models of the limit water content and relative density of red clay with the content of Fe₂O₃,Al₂O₃ and SiO₂ as variables is established respectively,the linear regression model between the liquid limit and plastic limit,the linear regression model between the plasticity index and liquid limit and the linear regression model between the relative density and plastic limit of red clay are established respectively,and the path model between the content of Fe₂O₃,Al₂O₃ and SiO₂ and the liquid limit,plastic limit,plastic index and relative density of red clay are also established.The influences of the chemical composition on the limit moisture content of red clay are finally analyzed.