单峰和双峰土水特征曲线基本参数的确定

发布时间：2018-06-12 10:10

本文选题：土水特征曲线 + 基本参数　；参考：《岩土工程学报》2017年10期

【摘要】：土水特征曲线基本参数(如进气值、残余吸力值和过渡区脱湿曲线的斜率等)的确定是预测非饱和土强度、渗透性以及本构关系的基础。基于修正Fredlund和Xing拟合方程,提出单峰和双峰土水特征曲线基本参数的确定方法。首先,对试验数据点进行最优化拟合,获取拟合方程的参数,对于双峰土水特征曲线,根据试样的孔径分布特征将其分段进行拟合;其次,根据拟合方程的几何关系求出过渡区和残余区土水特征曲线的斜率及其切线方程;再根据切线方程可以准确地确定单峰和双峰土水特征曲线的进气值、残余吸力值等。最后,利用单峰和双峰土水特征曲线的试验数据,验证了此方法的可行性。
[Abstract]:The determination of the basic parameters of soil-water characteristic curve (such as inlet value, residual suction value and slope of dehumidification curve in transition zone) is the basis of predicting the strength, permeability and constitutive relationship of unsaturated soil. Based on the modified Fredlund and Xing fitting equations, a method for determining the basic parameters of soil-water characteristic curves with single and double peaks is proposed. Firstly, the parameters of the fitting equation are obtained by optimizing fitting the test data points, and the bimodal soil-water characteristic curves are fitted according to the pore size distribution characteristics of the samples. The slope and tangent equation of soil-water characteristic curve in transition zone and residual region are obtained according to the geometric relation of fitting equation, and the inlet air value and residual suction value of characteristic curve of single and double peak soil-water can be accurately determined according to tangent equation. Finally, the feasibility of this method is verified by the experimental data of soil water characteristic curves with single and double peaks.
【作者单位】：上海大学土木工程系;
【基金】：国家自然科学基金项目(41402271,11672172)
【分类号】：TU43

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