Development of a hydraulic conductivity apparatus for bentonite soils
Development of a hydraulic conductivity apparatus for bentonite soils
复制标题
膨润土导水仪的研制
DOI：
10.1139/t07-025
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
J. Blatz
中科院分区：
文献类型：
--
作者：
Greg Siemens;J. Blatz
多孔介质中渗透系数的测量和解释是一个复杂的过程，对于不同的土壤类型和条件，存在着许多实验室仪器。为了使用模型来解释和预测渗透系数，需要精确的试验测量。提出了一种同时控制体积和应力状态的新型水力传导仪。该设备包括自动控制体积的能力，以在施加径向流动条件的同时应用选定的置换边界条件。该系统的能力是通过两个选定的水力传导性测试在不饱和沙子-膨润土混合物上进行的，这是一种膨胀土壤。用该系统测得的导水率约为10−13m/S，并与以前用类似材料测得的导水率进行了比较。测试后的测量显示了测试期间发生的内部水分含量、密度和饱和度的变化。
Measurement and interpretation of hydraulic conductivity in porous media is a complicated process, and many laboratory apparatuses exist for different soil types and conditions. To use models for interpretation and prediction of hydraulic conductivity, accurate test measurements are required. A new hydraulic conductivity apparatus is presented that includes simultaneous control of volume and stress states. The apparatus includes the ability to automatically control volume to apply selected displacement boundary conditions while imposing radial flow conditions. The capabilities of the system are displayed using two selected hydraulic conductivity tests on an unsaturated sand–bentonite mixture, which is a swelling soil. Hydraulic conductivity on the order of 10−13 m/s was measured using the new system and compared closely with previously measured values using a similar material. Post-test measurements displayed internal water content, density, and saturation changes that occurred during testing.