修正Van Genuchten模型拟合干旱、半干旱地区遗址土颗分曲线的可靠性研究

发布时间：2018-03-16 19:37

  本文选题：颗分曲线　切入点：修正Van　出处：《岩土力学》2017年02期 　论文类型：期刊论文

【摘要】：不均匀系数、曲率系数在土力学中的应用很广,但对精确求解d_(10)、d_(30)、d_(60) 3个参数的方法研究较少。提出了一种修正Van Genuchten(MVG)方程描述颗分曲线。以Matlab编程语言中的cftool为拟合工具,以青海黄土、青海遗址土、甘肃遗址土和新疆遗址土等33组土为研究对象,对比拟合方程描述遗址土颗分曲线的效果,分析MVG模型中3个参数a、m、n对曲线的影响。结果表明:MVG模型在拟合33组土的颗分曲线时均具有较好的效果,相关系数2R(29)0.98;参数a导致曲线偏移并可以推测土粒中的最大粒径,参数m影响土中的各颗粒组分的比例,参数n影响曲线的斜率。提出的MVG方程能够精确地求解d_(10)、d_(30)、d_(60) 3个参数。
[Abstract]:The inhomogeneity coefficient and curvature coefficient are widely used in soil mechanics, but there is little research on how to solve the three parameters exactly. A modified Van Genuchtenn MVG equation is proposed to describe the partition curve. The cftool in Matlab programming language is used as fitting tool. Taking 33 groups of soils such as Qinghai loess, Qinghai ruins soil, Gansu ruins soil and Xinjiang ruins soil as research objects, the effect of fitting equation to describe the curve of site soil grain is compared. The effect of the three parameters of MVG model on the curve is analyzed. The results show that the ratio MVG model has a good effect in fitting the curve of 33 groups of soils, and the correlation coefficient is 2R ~ (29) ~ (0.98), the parameter a causes the curve deviation and the maximum particle size in soil particles can be estimated. Parameter m affects the proportion of particle components in soil and parameter n affects the slope of the curve. The proposed MVG equation can accurately solve 3 parameters: d / 10 / D / D / T / 30 / D / D _ (60).
【作者单位】： 兰州大学西部灾害与环境力学教育部重点实验室;兰州大学土木工程与力学学院;
【基金】：国家重点基础研究发展计划(973)项目(No.2014CB744701) supported by the National Program on Key Basic Research Project of China(973 Program)(2014CB744701)
【分类号】：TU411
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本文编号：1621397