基于电阻率法的膨胀土吸水膨胀过程中结构变化定量研究  

Quantitative research on microstructures of expansive soils during swelling using electrical resistivity measurements

作　　者：查甫生[1,2] 刘松玉[2] 杜延军[2] 崔可锐[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]东南大学岩土工程研究所,江苏南京210096

出　　处：《岩土工程学报》2008年第12期1832-1839,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(40802079);国家自然科学基金项目(50478073);江苏省高校研究生科技创新计划资助项目(2006-078)

摘　　要：针对非饱和黏性土结构定量研究中存在的困难以及现有的土的结构性研究方法所存在的不足,引入能同步反映土的微结构变化的电阻率方法,探讨土的电阻率方法在黏性土微结构定量研究中的应用。通过膨胀土击实样的无荷膨胀试验,同步测定土样的竖向电阻率与横向电阻率,计算出土的电阻率结构性参数指标,包括土的竖向与横向结构因子、平均结构因子、各向异性系数与平均形状因子的大小,通过研究土样吸水膨胀过程中的土的电阻率结构性参数指标的变化规律,建立描述膨胀土微结构变化的电阻率评价方法。试验结果表明,土的电阻率方法具有连续、快捷与测试方便等优点,其结构性参数指标可有效用于土的微结构变化定量研究。The existing methods were difficult to do quantitative researches on the microstructure of unsaturated clays. An electrical resistivity method was introduced into the microstructure studies on clayey soils and its effectiveness was evaluated. The swelling tests were performed on the compacted expansive soil samples with a modified oedometer consolidation cell, and at the same time the vertical and horizontal electrical resistivities were measured during swelling. The electrical parameters, such as the vertical structure factor, the horizontal structure factor, the average structure factor, the anisotropic electrical index and the average shape factor were then calculated and studied. It was shown that the electrical resistivity method was effective in quantitative studies on the variation of microstructure of expansive soils during swelling.

关 键 词：膨胀土 电阻率 微结构 定量研究 

分 类 号：TU411[建筑科学—岩土工程]