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Position: Home > Articles > 土壤吸力测试方法对土壤水分特征曲线的影响 Water Saving Irrigation 2018 (8)

土壤吸力测试方法对土壤水分特征曲线的影响

作  者：
王磊;杨松
关键词：
接触角;张力计;滤纸法;压力板仪;砂土
摘  要：
为了研究土壤吸力测试方法对土壤水分特征曲线的影响,以砂土为试验材料,利用张力计、滤纸和压力板仪分别测得砂土的水分特征曲线并通过VG模型进行拟合.得出了在相同含水率下压力板仪(退湿)测得的吸力大于张力计连续测量法测得的吸力大于张力计间断测量法测得的吸力,张力计间断测量法和滤纸法测得的吸力几乎相等.从物理化学的角度分析了由于接触角滞后会导致不同测试方法所对应的接触角存在差异,以及接触角变化对砂土吸力的影响.从理论分析和试验结果得出导致造成测量结果不同的原因是在测试时土体中接触角滞后造成的,接触角滞后对压力板仪和张力计影响非常大,而对滤纸法影响非常小.随着接触角的增大,压力板仪和张力计的测量结果将会变小.在自然状况下,滤纸法和张力计的测量结果十分接近.
作  者：
WANG Lei;YANG Song;College of Water Conservancy,Yunnan Agricultural University;
单  位：
WANG Lei%YANG Song%College of Water Conservancy,Yunnan Agricultural University
关键词：
contact angle;;tensiometer;;filter paper method;;pressure plate apparatus;;sand
摘  要：
In order to study the effect of soil suction test method on soil water characteristic curve,sand is used as the test material,and the tensiometer,filter paper and the pressure plate are used to measure sand soil water characteristic curve and the measured data is fitted by VG model. It is concluded that under the same rate of water,the suction measured by the pressure plate( drying) is greater than tensiometer continuous measurement and tensiometer discrete measurement,the tensiometer discrete measurement value is almost equal to the suction measured by the filter paper method. From the perspective of the physical chemical analysis,the phenomenon that the contact angle hysteresis can lead to difference contact angle for different test methods is analyzed,as well as the effect of contact angle change on sand suction. From theoretical analysis and experimental results,it is concluded that the different measurement results is caused by the contact angle hysteresis in the soil. Contact angle hysteresis has large effects on the pressure plate and tensiometer,but very little effect on filter paper method. With the increase of contact angle,the measurement results of pressure plate and tensiometer will be smaller. The measurement results of the filter paper method is very close to that of the tensiometer in the natural condition.

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