黄土构度与物理指标之间的定量关系

发布时间：2018-03-29 05:15

本文选题：土力学　切入点：黄土　出处：《岩石力学与工程学报》2015年S2期

【摘要】：黄土是一种具有特殊结构性的土,其结构性可用构度指标定量描述。目前,学术界对构度与物理指标之间的定性关系研究较多,而对定量关系研究较少。为研究黄土构度与物理指标之间的定量关系,对取自7个不同场地的黄土试样分别进行不同含水量下的原状、重塑及饱和黄土的单轴抗压强度试验,计算不同含水量下各黄土的构度。通过拟合对比及验证的方法,分析各黄土构度与含水量的定量关系,结果表明:(1)与指数函数和幂函数拟合相比较,将幂函数变换后得到的线性拟合曲线与试验结果最为接近,得到黄土构度与含水量定量关系的经验公式;(2)工程范围内黄土构度的变化范围在干构度与饱和构度之间;(3)建立一个综合物理指标Z,得到黄土干构度与物理指标定量关系的经验公式。这些定量关系将有利于构度指标在黄土工程中的实际应用。
[Abstract]:Loess is a kind of soil with special structure, and its structure can be quantitatively described by structural index. At present, there are many studies on the qualitative relationship between structural degree and physical index in academic circles. In order to study the quantitative relationship between the texture of loess and the physical indexes, the uniaxial compressive strength tests of loess samples taken from 7 different sites under different water content were carried out respectively, and the uniaxial compressive strength of the loess was remolded and saturated. The quantitative relationship between loess structure and water content is analyzed by fitting, comparing and verifying. The results show that the structure of loess is compared with exponential function and power function fitting. The linear fitting curve obtained by the transformation of power function is most close to the experimental results. The empirical formula of quantitative relationship between loess texture and water content is obtained. The variation range of loess texture within the scope of engineering is between dry structure and saturated texture. A comprehensive physical index Z is established, and the determination of loess dryness and physical index is obtained. These quantitative relationships will be beneficial to the practical application of the structural index in loess engineering.
【作者单位】：西安理工大学岩土工程研究所;西安理工大学陕西省黄土力学与工程重点实验室;
【基金】：国家自然科学基金资助项目(41272320) 西安理工大学陕西省黄土力学与工程重点实验室重点科研计划项目(13JS074)
【分类号】：TU444

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