本文選題：顆分曲線　切入點：修正Van　出處：《巖土力學(xué)》2017年02期 　論文類型：期刊論文

【摘要】：不均勻系數(shù)、曲率系數(shù)在土力學(xué)中的應(yīng)用很廣,但對精確求解d_(10)、d_(30)、d_(60) 3個參數(shù)的方法研究較少。提出了一種修正Van Genuchten(MVG)方程描述顆分曲線。以Matlab編程語言中的cftool為擬合工具,以青海黃土、青海遺址土、甘肅遺址土和新疆遺址土等33組土為研究對象,對比擬合方程描述遺址土顆分曲線的效果,分析MVG模型中3個參數(shù)a、m、n對曲線的影響。結(jié)果表明:MVG模型在擬合33組土的顆分曲線時均具有較好的效果,相關(guān)系數(shù)2R(29)0.98;參數(shù)a導(dǎo)致曲線偏移并可以推測土粒中的最大粒徑,參數(shù)m影響土中的各顆粒組分的比例,參數(shù)n影響曲線的斜率。提出的MVG方程能夠精確地求解d_(10)、d_(30)、d_(60) 3個參數(shù)。
[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).
【作者單位】： 蘭州大學(xué)西部災(zāi)害與環(huán)境力學(xué)教育部重點實驗室;蘭州大學(xué)土木工程與力學(xué)學(xué)院;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃(973)項目(No.2014CB744701) supported by the National Program on Key Basic Research Project of China(973 Program)(2014CB744701)
【分類號】：TU411
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本文編號：1621397