Microporous Membrane Technology for Measurement of Soil-Water Characteristic Curve

Microporous Membrane Technology for Measurement of Soil-Water Characteristic Curve
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微孔膜技术测量土水特征曲线

DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
H. Rahardjo
H. Rahardjo
中科院分区：
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文献类型：
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作者：
Tomoyoshi Nishiumura;J. Koseki;D. Fredlund;H. Rahardjo

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在三轴和直剪试验以及获得土-水特征曲线的试验中，通常使用高进气陶瓷盘来控制基质吸力。岩土工程师越来越多地使用高空气进入陶瓷盘，以测量或控制基质吸力在非饱和土测试。与使用高空气入口陶瓷盘相关的限制之一是为了在盘上建立平衡条件所需的时间。提高与建立吸力平衡相关的效率是岩土工程师相当感兴趣的。涉及使用微孔膜的压力膜技术是一种可能的技术，其可以导致基质吸力的测量或控制的改进的性能。如果可以使用微孔膜技术，最终结果可以提供相当大的时间和成本节省，特别是在土壤-水特征曲线（SWCC）的测量。在这项研究中，一个新的装置开发，利用微孔膜的测量SWCC与基质吸力高达25 kPa。最大AEV（即，空气进入值）为250 kPa。本文介绍了利用压力膜技术对几种土壤进行SWCC实验室测量的结果。对传统的压力板装置和新型微膜装置测得的土-水特征曲线进行了比较。
High air entry ceramic disks are commonly used for the control of matric suction in triaxial and direct shear tests and in tests for obtaining the soil-water characteristic curve. Geotechnical engineers have made increasing use of high air entry ceramic disks in order to measure or control matric suctions during unsaturated soil testing. One of the limitations associated with the use of high air entry ceramic disks has been the time required in order for equilibrium conditions to be established across the disk. Improving the efficiency associated with establishing suction equilibrium is of considerable interest to geotechnical engineers. Pressure membrane technology involving the use of microporous membranes is one possible technology that could result in improved performance for the measurement or control of matric suctions. If microporous membrane technology can be used, the end result could provide considerable time and cost savings, particularly in the measurement of soil-water characteristic curves (SWCCs). In this study, a new apparatus was developed to make use of a microporous membrane for the measurement of the SWCC with matric suction of up to 25 kPa. The maximum AEV (i.e., air-entry value) of the membrane is 250 kPa. This paper presents the results of laboratory SWCC measurements on several soil types using pressure membrane technology. Comparisons are made between the soil-water characteristic curves measured using a conventional pressure plate apparatus and those obtained from the new micro membrane apparatus.