Measurement and prediction of water retention curve of remolded loess with different degrees of compaction
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摘要: 为了研究不同压实度重塑黄土持水曲线,采用自制低吸力测试装置、张力计和GDS非饱和土三轴仪等仪器联合测定不同压实度重塑黄土持水曲线,并应用VG模型和基于VG模型考虑变形效应的持水曲线模型分别对单一压实度持水曲线拟合和所有压实度持水曲线拟合,得到模型参数并分析了预测精度。结果表明：采用多手段测试持水曲线的方法是可行的；不同压实度黄土VG模型拟合函数中进气值发生变化,而控制持水曲线变化速率的参数n除高压实度外都很接近,为考虑变形效应的持水模型函数形式提供了试验依据；基于VG模型考虑变形效应的持水曲线模型在预测不同压实度持水曲线方面具有足够的精度,可以用于具有不同压实度黄土填方中的持水曲线预测。Abstract: In order to study the water retention curve of remolded loess with different degrees of compaction, the self-made low suction measurement device, tensiometer and GDS unsaturated soil triaxial apparatus were used to measure the water retention curve of remolded loess with different degrees of compaction.The VG model and the model based on the VG model considering the deformation effect were adopted to fit the water retention curves under a single degree of compaction and all the degrees of all compaction, respectively, and the model parameters were obtained and the accuracy of fitting was analyzed.The results show that the method for measuring the water retention curve by using the multiple methods is feasible.For the fitted VG model, the air-entry value changes with different degrees of compaction, and the parameter n controlling the rate of change of the water retention curve is almost same except for the high degree of compaction, which provides a test basis for the form of the water retention curve function when considering the deformation effect.The water retention curve model considering the deformation effect based on the VG model has sufficient accuracy in predicting water retention curves of loess with different degrees of compaction, and can be used for the prediction of water retention curves of loess fills with different degrees of compaction.
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图 2 不同压实度重塑黄土持水曲线实测值与VG模型拟合值对比
Figure 2. Comparison between measured data of SWRC and fitting curves using VG model for remolded loess with different degrees of compaction
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图 3 不同压实度重塑黄土持水曲线实测值与本文统一模型预测值对比
Figure 3. Comparison between measured SWRCs and predicted curves using proposed model under different compaction degrees of remolded loess
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图 4 简化本文统一模型预测值与实测值对比
Figure 4. Comparison between measured and predicted SWRCs using proposed unified model
表 1 试验土料物理性质指标
Table 1 Physical properties of test soil
颗粒相对密度Gs 塑限wp/% 液限wL/% 塑性指数Ip 最大干密度ρd/(g·cm-3) 最优含水率wopt/% 2.71 18.7 35.1 16.4 1.73 19.1 
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表 2 不同压实度黄土吸力测试方案
Table 2 Suction measurement of loess with different degrees of compaction
压实度 饱和度Sr/% 自制低吸力装置 张力计 GDS三轴仪 0.75 89,85,80,75 70,65,60 50,40 0.80 90,85,80 75,70,65,60 50,40 0.90 95,92.5,90 85,82.5,80 75,70,60,50 1.0 100,98.5 95,92.5 90,85,80,70
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表 3 不同压实度重塑黄土VG模型拟合参数
Table 3 Fitting parameters of VG model for remolded loess with different degrees of compaction
压实度 软件 参数 θs θr α n 0.75 RETC 0.4885 — 0.3666 1.2024 Origin 0.4884 0.0417 0.3638 1.2238 0.80 RETC 0.4540 — 0.1131 1.2262 Origin 0.4534 0.0352 0.1116 1.2545 0.90 RETC 0.4046 — 0.0268 1.2680 Origin 0.4047 0 0.0274 1.2625 1.0 RETC 0.3615 — 0.0040 1.6479 Origin 0.3614 0 0.0040 1.6558
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表 4 考虑变形效应的统一模型拟合参数
Table 4 Fitting parameters for remolded loess with different degree of compaction using SWRC model considering deformation effect
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