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利用时域反射仪(TDR)与微型张力计(T5)联用装置,测定气-水两相砂介质中因水位波动产生的连续干燥与湿润循环过程中饱和度-毛细压力(S-p)关系曲线.同时,研究了多重水位波动对S-p关系曲线、孔隙流体运移的滞后性及空气剩余饱和度的作用.结果表明,TDR、T5和数据自动采集器联用装置可较准确测量出气-水两相条件下S-p关系的动态变化.同一介质中不同干燥过程的侵入压值比较接近,与干燥过程的初始水饱和度无关;而干燥或湿润过程的S-p关系曲线和滞后程度则与其初始水饱和度密切相关.在特定的干燥和湿润循环过程中,初始水饱和度大小对空气剩余饱和度的值影响不大,用于预测非湿润相流体剩余饱和度的Land的假设需要修正.本研究结果对进一步研究水位波动条件下地下有机污染物运移具有借鉴作用,可为修正NAPLSimulator提供实验依据.
The relationship between saturation and capillary pressure (Sp) during continuous drying and wetting cycles caused by water level fluctuation in gas-water two-phase sand media was determined by using a combination of time-domain reflectometer (TDR) and microtensometer (T5) At the same time, the effect of multiple water level fluctuations on Sp curve, the lag of pore fluid migration and the residual air saturation were studied.The results show that the combination of TDR, T5 and automatic data acquisition device can accurately measure the gas- Phase under the conditions of Sp dynamic relationship between changes in the same medium in different drying process intrusion pressure values are relatively close, and the initial water saturation of the drying process has nothing to do; and dry or wet process Sp relationship curve and lag degree and its initial water saturation , The initial water saturation has little effect on the residual air saturation value in the specific drying and wetting cycles.The hypothesis of Land for predicting the residual saturation of the non-wetting phase fluid needs to be corrected.In this study, Further study on the movement of underground organic pollutants under fluctuating water level can be used as a reference, which can provide experimental evidence for the amendment of NAPLSimulator.