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要更完全和精确地预测膨胀土隆胀变形,需先确认其微观结构性质与胀缩性能间的相关性。按最新研究,膨胀土的孔径分布和表面积两微观性质相关参数被试着用于鉴定、检验对膨胀行为的协同影响。为深入该项研究,从膨胀土地区取8种土样,对压实样开展常规一维膨胀试验及新型三维体积膨胀变形试验;用压汞仪法(MIP)测微结构孔隙分布;用化学乙二醇乙醚法(EGME)测内比表面积,分析孔径分布和比表面积两参数预测其宏观膨胀性能。模型分析结果表明:所选土样膨胀行为取决于粘土矿物成分及内部孔隙分布的新引入参数,新建膨胀模型在描述选定土样重要矿物成分和孔隙结构细节的同时能准确预测土的膨胀变形。
To predict the swelling deformation of expansive soil more completely and accurately, it is necessary to confirm the correlation between microstructural properties and expansion and contraction properties. According to the latest research, pore size distribution and surface area of expansive soils are used to identify and test the synergistic effect on swelling behavior. In order to study in depth, 8 kinds of soil samples were taken from the expansive soil area, and conventional one-dimensional expansion test and new three-dimensional volume expansion deformation test were carried out on the compacted samples. The microstructure pore distribution was measured by mercury intrusion porosimetry (MIP) The specific surface area measured by EGME method was used to predict the macroscopic expansive properties by analyzing two parameters of pore size distribution and specific surface area. The results of model analysis show that the swelling behavior of the selected soil depends on the newly introduced parameters of clay mineral composition and internal pore distribution. The new expansion model can accurately predict the soil deformation and deformation while describing the important mineral composition and pore structure of selected soil samples .