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首页> 外文会议>International Symposium on Geotechnical Measurements and Modelling; Sep 23-25, 2003; Karlsruhe, Germany >A modular triaxial testing device for unsaturated soils
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A modular triaxial testing device for unsaturated soils

机译：模块化三轴非饱和土壤测试装置

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摘要

Soil-mechanics experimentation on partly saturated specimens requires special equipment to measure forces and deformations. A new triaxial testing device has been developed to determine the soil-water characteristic curve, the unsaturated hydraulic conductivity, and the shear strength. The volume change of the unsaturated specimen is measured by the flow of the cell fluid into or out of the triaxial cell. To allow accurate measurements of the volume change, a double walled triaxial cell has been designed. Ruggedly designed tie bars prevent vertical deformation. To prevent any falsification of the volume change measurement silicon oil is used as cell fluid. Matric suction (u_s = u_a- u_w) is applied at the top and bottom of the soil specimen via the axis-translation technique. The aim is a fast and nearly uniform distribution of matric suction in the specimen. The unsaturated hydraulic conductivity is determined by subjecting different matric suctions at the top and bottom of the specimen. The presented test procedure avoids many of the known problems which are connected with the direct and indirect measurement from the unsaturated hydraulic conductivity; by taking the total and pore-water volume change of the unsaturated specimens into account.
机译：在部分饱和的标本上进行土壤力学实验需要特殊的设备来测量力和变形。已经开发出一种新的三轴测试装置来确定土壤-水特征曲线，不饱和导水率和剪切强度。不饱和样品的体积变化是通过细胞液流入或流出三轴细胞的流量来测量的。为了准确测量体积变化，已经设计了双壁三轴单元。坚固的拉杆设计可防止垂直变形。为了防止体积变化的任何伪造，将硅油用作细胞液。通过轴平移技术在土壤样品的顶部和底部施加矩阵吸力（u_s = u_a- u_w）。目的是在样品中快速且几乎均匀地分布基质吸力。通过在样品的顶部和底部施加不同的基质吸力来确定不饱和水力传导率。提出的测试程序避免了许多与不饱和导水率直接和间接测量有关的已知问题。通过考虑非饱和标本的总体积和孔隙水体积变化。

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