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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Effects of residual suction and residual water content on the estimation of permeability function
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Effects of residual suction and residual water content on the estimation of permeability function

机译：残余吸水含量对渗透功能估计的影响

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摘要

Soil-water characteristic curve (SWCC), which defines the relationship between water amount in the soil and metric suction, contains key information for the application of unsaturated soil mechanics principles to engineering practice. Best fit equations are commonly used for representation of the SWCC for unsaturated soils. Normally, these best fit equations are mathematically continuous and governed by a few fitting parameters. Either volumetric water content, theta(w) or normalized volumetric water content, circle minus, is adopted in the different best fit equations. If theta(w) is used to establish SWCC, the parameter related to residual suction, C-r needs to be defined prior to fitting process of SWCC data. On the other hand, if circle minus is used to develop SWCC, the residual volumetric water content, theta(r), needs to be defined prior to fitting process of SWCC data. Results of analyses in this study indicate that the performance of the best fit equation is not affected by the value of C-r, but it is significantly affected by the value of theta(r). As a result, the performance on the estimation of the permeability function is also affected by the value of theta(r). Different types of soils are used to investigate the effect of Cr and theta(r) on the performance of the best fit equation and the estimation of the permeability function.
机译：土壤 - 水特征曲线（SWCC），它定义了土壤和公制吸力中的水量之间的关系，包含了不饱和土修原理在工程实践中应用的关键信息。最佳赋板方程通常用于不饱和土的SWCC的表示。通常，这些最佳拟合方程在数学上连续并且由几个拟合参数控制。在不同的最佳拟合方程中采用体积含水量，θ（W）或归一化体积含水量，圈数量。如果使用THETA（W）来建立SWCC，则需要在SWCC数据的拟合过程之前定义与剩余抽吸，C-R相关的参数。另一方面，如果使用圆数减去用于开发SWCC，则需要在SWCC数据的拟合过程之前定义残留体积含水量Theta（R）。本研究中分析结果表明，最佳拟合方程的性能不受C-R值的影响，但它受到THETA（R）的值的显着影响。结果，渗透函数估计的性能也受到THETA（R）的值的影响。使用不同类型的土壤来研究Cr和Theta（R）对最佳拟合方程的性能和渗透功能的估计的影响。

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