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针对非饱和土壤水分特征曲线传统测量方法上对仪器精度要求高、耗时长、成本高的问题,研究了土壤水分特征曲线高吸力段误差对入渗模拟结果的影响。针对黏土的土壤水分特征曲线,设计了正负共8种高吸力段的偏离情况,利用数值模拟方法分析土壤入渗过程,得到累积入渗过程、湿润锋发展过程和4个典型时刻的土壤水分分布。结果表明,土壤水分特征曲线在吸力大于100 cm部分存在不超过±20%的偏差时,对于土壤入渗数值模拟结果无显著影响,因此,对土壤水分特征曲线高吸力段的试验精度要求可适当放宽。
In view of the problems of high accuracy, long time and high cost in the traditional measurement methods of unsaturated soil moisture characteristic curve, the influence of the high suction section error of soil water characteristic curve on infiltration simulation results was studied. According to the soil water characteristic curve of clay, 8 deviations of positive and negative superabsorbents were designed. The soil infiltration process was analyzed by numerical simulation, and the cumulative infiltration process, wetting front development process and soil moisture at 4 typical times distributed. The results showed that the soil water characteristic curve had no significant effect on the simulation results of soil infiltration when the suction greater than 100 cm did not exceed ± 20%. Therefore, the test accuracy of the high suction section of soil water characteristic curve could be appropriate Relax.