孔隙度对黏性土渗透系数影响的试验研究

利用传统渗透系数经验公式计算黏性土渗透系数时,计算结果与黏性土渗透试验实测数据常存在一定的误差,对实际工程建设加固与修复产生较大影响。为修正此误差,选取两种不同的黏性土制成干密度不同的试样,结合变水头渗透试验研究黏性土孔隙比对渗透系数的影响,拟合黏性土孔隙比与渗透系数之间的函数关系,并分析讨论了传统渗透系数经验公式计算黏性土时误差较大的原因。研究成果符合黏性土的渗透规律,为工程防渗及地基沉降提供了参考。

Experimental Research on The Influence of Porosity on Permeability Coefficient of Clay Soil

The dams, foundation pit support and anti-fouling works of water conservancy projects are all related to permeability of soil. It is necessary to calculate the permeability coefficient of soil accurately for civil engineering and practical water conservancy projects. Though relevant scholars have carried on plenty of research on theories and experiments of permeability coefficient of clay, there are certain errors between the calculation results of traditional empirical formula of permeability coefficient and the measured data of permeability test. This has a great impact on the reinforcement and restoration of practical engineering construction. In this paper, two types of clay are selected to make samples, which combine with experiments on permeability coefficient of variable sources to study the effect on void ratio of clay on permeability coefficient and fit the functional relation between void ratio of clay and permeability coefficient. Furthermore, the reasons for distinct errors in calculating clay by traditional empirical formula of permeability coefficient are discussed. The research achievement accords with the rule of clay permeability, providing a reference for engineering seepage control and foundation settlement.