抽象
目 的
在采用统计法估测非饱和渗透系数的过程中, 探 讨水-土特征曲线分段的不同方法和不同数量对 估测结果的影响。
创新点
比较在体积含水量区间和土吸力区间分割水-土特 征曲线对估测非饱和渗透系数的影响; 最终建议 在土吸力区间分割水-土特征曲线。
方 法
采用现有模型和数学公式, 对比不同类型土质 (单 峰和双峰水-土特征曲线) 估测和实验测量的非饱 和渗透系数。
结论
1. 传统的在体积含水量区间分割水-土特征曲线会 造成对低吸力区域的非饱和渗透系数的估测不 够精确。 2. 综合比较单峰和双峰的水-土特征曲线 及 2 种不同分割水-土特征曲线的方法, 发现在分 段大于 40 片时, 估测结果非常接近实验结果。 因此, 在采用统计法估测土体的非饱和渗透系数 时, 建议在土吸力区间对水-土特征曲线进行分 割, 且分割数量应该大于40。
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Project supported by the National Natural Science Foundation of China (No. 51878160) and the National Key Research and Development Program of China (No. 2017YFC00703408)
Contributors
Qian ZHAI and Chen-feng ZHANG wrote the first draft of the manuscript. Qian ZHAI, Chen-feng ZHANG, Guo-liang DAI, and Xue-liang ZHAO revised and edited the final version of the manuscript.
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Qian ZHAI, Chen-feng ZHANG, Guo-liang DAI, and Xue-liang ZHAO declare that they have no conflict of interest.
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Zhai, Q., Zhang, Cf., Dai, Gl. et al. Effect of segments of soil-water characteristic curves on the estimated permeability function using statistical methods. J. Zhejiang Univ. Sci. A 20, 627–633 (2019). https://doi.org/10.1631/jzus.A1900166
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DOI: https://doi.org/10.1631/jzus.A1900166