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。
Loess is a kind of special structural soil. The structure can be described by a quantitative parameter called structural index. At present,qualitative relationships between structural and physical indices have been studied a lot,but seldom for quantitative relationships. In order to study the quantitative relationship between the structural and physical indexes of loess,a series of uniaxial compressive strength tests of undisturbed,remoulded and saturated loess specimens sampled from seven different fields were carried out respectively under different water contents,and the corresponding structural indices under different water contents were calculated. Furthermore,the quantitative relationships between structural index and water content were analyzed by the methods of data fitting,the comparison of fitting curves and the test verification. It is shown that the linear fitting curve converted from power function fits the laboratory results much better than exponential and power functions. The empirical formula of the quantitative relationships between structural index and water content are obtained. And the magnitude of structural index in engineering would change from the dry structural index to the saturated structural index. Thereby,a comprehensive physical index Z was proposed to calculate the dry structural index and empirical formula for the quantitative relationships between the dry structural index and physical indices was presented. These quantitative relationships would be beneficial for the application of structural index to practical engineering.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2015年第S2期4380-4386,共7页
Chinese Journal of Rock Mechanics and Engineering
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)
关键词
土力学
黄土
结构性
构度指标
物理指标
定量关系
soil mechanics
loess
structure
structural index
physical index
quantitative relationship
