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Measurement of Suction Stress in Adsorption Regime

机译：吸附制度中吸收压力的测量

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摘要

Quantification of the intergranular forces or suction stresses of soils in high suction range greater than 0.1 GPa has been a challenge for years due to the difficulties in controlling the relative humidity while determining the physicochemical interaction between solid particles and water molecules. A relative humidity-controlled environmental chamber capable of controlling matric suction greater than 0.1 GPa was designed to manipulate the vapor equilibrium of the soil sample. Dry air and molecular sieve were step-wisely delivered to decrease the soil moisture as low as 0.21% in relative humidity, equivalent to about 0.85 GPa of matric suction. Digital camera was used to capture the corresponding soil deformation and volume change. This technique investigated the intrinsic relationship between stress and deformation of soil under high suction dominated by water vapor adsorption mechanism, and provides promising information for swelling potential and classifications of expansive soils.
机译：由于在确定固体颗粒和水分子之间的物理化学相互作用的同时控制相对湿度的困难，在大于0.1GPa的高于0.1GPa的高于0.1GPa的土壤中的骨间力或抽吸胁迫的定量是挑战。设计能够控制大于0.1GPa的相对湿度控制的环境室，以操纵土样品的蒸汽平衡。干燥空气和分子筛是逐步递送的，以将土壤水分降低至相对湿度的0.21％，相当于约0.85GPa的测力吸力。数码相机用于捕获相应的土壤变形和体积变化。该技术研究了水蒸气吸附机制主导地位的高吸痰中土壤应力和变形的内在关系，并提供了膨胀土壤膨胀潜力和分类的有希望的信息。

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