2) soil-water characteristic curve
水分特征曲线
1.
In order to describe the relationship between matrix suction and water content,soil-water characteristic curve(SWCC) tests in lab and field were carried on.
为了描述非饱和土基质吸力与含水量的关系特性,进行了室内外土体水分特征曲线(SWCC)测试,分析了试样物质成分、塑性指数、孔隙结构、应力状态等因素对SWCC测试的影响;在自然边坡、挖方边坡、填方边坡上进行了基质吸力变化规律的实测,对比了在不同应力、填土条件下基质吸力变化规律的差异性。
2.
Based on the observation data of soil negative pressure h and soil water content θ obtained at the Luancheng Agricultural Ecosystem Station of Chinese Academy of Sciences,soil-water characteristic curve(h-θ carve)are described by using the van Genuchten model(VG model).
根据中国科学院栾城试验站大田土壤剖面所采土样实测土壤负压h和土壤含水率θ实验数据,采用van Genuchten模型来描述土壤水分特征曲线(h-θ曲线),VG模型中的参数利用Matlab非线性拟合函数来确定,通过对四参数模型和三参数模型的比较表明,四参数模型拟合的参数与三参数模型中的参数非常接近,但四参数模型能够更好地拟合实测数据,误差比三参数模型相对较小。
3.
A number of laboratory tests, including the microstructure, the strength and strain characteristics and the soil-water characteristic curves of Guangxi and Hefei expansive soils, were undertaken and the test results were analyzed based on the principle of unsaturated soil mechanics.
本文以国家自然科学基金课题“非饱和膨胀土的结构特征与结构强度研究”(批准号:40374047)为依托,以广西宁明膨胀土为研究对象,应用非饱和土土力学理论,进行了大量的室内试验研究,并对试验数据进行深入分析,主要就非饱和重塑膨胀土的微观结构特征、强度与变形特征以及水分特征曲线等方面取得了以下成果: 1。
3) moisture characteristic curve
水分特征曲线
1.
The paper surveys, determines and analyzes the moisture characteristic curve of feldsparthic sandstone which is widely distributed in the Huangpuchuan River basin and chestnut soil that takes feldsparthic sandstone as mother develop ment for approaching the usability of feldsparthic sandstone.
为探讨砒砂岩的可利用性,对皇甫川流域广泛分布的砒砂岩和以砒砂岩为母质发育的栗钙土的水分特征曲线进行了测定和分析,结果表明:栗钙土具有较好的透水性和持水性;紫红色砒砂岩的透水性与持水性比栗钙土好;白色砒砂岩的透水性和持水性相对较差。
2.
The determination of the moisture characteristic curve of unsaturated bentonite with saturated salt solution method is introduced in this paper.
鉴于膨润土各项性质研究的重要性 ,本文介绍了利用盐溶液法进行非饱和膨润土水分特征曲线的测定工作 ,发现盐溶液法适合测定吸力极高的非饱和土 ,是一种值得推广的方法。
4) water characteristic curve
水分特征曲线
1.
The study on characteristics of water characteristic curve of mixed stroma of the peat and soil
泥炭配合基质水分特征曲线的特性研究
2.
The seepage parameter test results for completely weathered granite at the Three Gorges Dam site are presented, including permeability and water characteristic curve obtained by in situ tests and those obtained by laboratory tests on disturbed/undisturbed samples.
介绍了三峡工程坝址区花岗岩全风化带的基本特征及其渗流参数实验研究结果，包括通过现场实验、室内原装样和扰动样实验取得的饱和渗透系数、非饱和水分特征曲线，分析了不同实验对花岗岩全风化带渗流特性的不同反映，指出了不同实验结果的意义和使用条件。
3.
By soil water dynamics principle there were determined soil water movement parameters on sandy land vineyard in laboratory, namely water characteristic curve, saturated water conductivity and unsaturated water conductivity, and the saturated water conductivity is 0\^12 cm\5min\+\{-1\}.
利用土壤水动力学原理 ,在室内测定了沙质土壤水分特征曲线、饱和导水率和非饱和导水率。
5) soil water characteristic curve
水分特征曲线
1.
Because direct measurement of suction is costly time, consuming and difficult, generally, suction is indirectly found with soil water characteristic curve, thus, the precision is not good enough.
针对测定非饱和土的吸力既费时、费钱，又困难，而且往往是通过水分特征曲线间接求取，以致其精度不够理想这一问题，尝试采用人工神经网络进行预测研究，将部分已有的试验数据（含水量，吸力数据）作为输入模式进行训练，然后利用网络参数进行相应的参数预测。
6) soil water retention curve
水分特征曲线
1.
In this research two representative methods of estimating soil hydraulic properties based on soil water retention curve and simple infiltration were employed,and unsaturated hydraulic properties were estimated and compared by these two methods for different textural purple soils.
本研究选择颇具代表性的土壤水分特征曲线推求法和简单入渗法两种方法,分别推求不同质地紫色土导水参数,并进行了分析比较。
补充资料：曲线拟合
| 曲线拟合 curve fitting 用连续曲线近似地刻画或比拟平面上离散点组所表示的坐标之间的函数关系的一种数据处理方法。用解析表达式逼近离散数据的一种方法。在科学实验或社会活动中，通过实验或观测得到量x与y的一组数据对(xi，yi)（i＝1，2，…m），其中各xi是彼此不同的 。人们希望用一类与数据的背景材料规律相适应的解析表达式，y＝f(x，c）来反映量x与y之间的依赖关系，即在一定意义下“最佳”地逼近或拟合已知数据。f(x，c)常称作拟合模型 ，式中c＝(c1，c2，…cn)是一些待定参数。当c在f中线性出现时，称为线性模型，否则称为非线性模型。有许多衡量拟合优度的标准，最常用的一种做法是选择参数c使得拟合模型与实际观测值在各点的残差(或离差)ek＝yk－f(xk，c)的加权平方和达到最小，此时所求曲线称作在加权最小二乘意义下对数据的拟合曲线。有许多求解拟合曲线的成功方法，对于线性模型一般通过建立和求解方程组来确定参数，从而求得拟合曲线。至于非线性模型，则要借助求解非线性方程组或用最优化方法求得所需参数才能得到拟合曲线，有时称之为非线性最小二乘拟合。 |
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条