摘要
水流对岩土粒度的搬运主要有翻滚推移和悬浮2种方式,翻滚推移搬运物无论是粒度分布还是沉积规律都与悬浮搬运物差异很大,因此2种搬运方式所携带的物质沉积生成2种具有不同分形特征的沉积物,且沉积岩土可为2种具有不同分形维数沉积物的混合物。目前常用的粒度分形模型尚未考虑到这种情况,应用到岩土粒度分布描述时存在较大的误差。在常用模型的基础上,建立针对沉积岩土粒度分布描述的改进分形模型,并对模型参数的物理意义进行验证。与常用模型分形维数相比,成因不同的沉积岩土中悬浮搬运成分的分形维数值差别更为显著,该分形维数能更好地反映不同岩土沉积环境及其粒度分选程度。最后,将该模型应用于湖南红层软岩崩解性差异分析,取得较好的效果。
Material transportation in water fluid mainly depends on two main movements, which are rolling transportation and suspending transportation. The transportation and deposit regulation are different in the two different transportation modes. Since the two kinds of sediments produced by the two kinds of transportation movements may have different fractal characteristics; sedimentary rock and soil display the mixtures of the two kinds of sediments with different fractal characteristics. The traditional fractal model does not consider the larger error that may be produced when the traditional fractal model is employed in describing the size distribution of sedimentary rock and soil. On the assumption that common sedimentary rock and soil are mixtures of the two kinds of sediments with different fractal characteristics, an improved fractal model of size distribution is conducted; and the physical meaning of parameters of the model is validated too. Compared with traditional fractal model, the fractal dimension of suspend transportation deposit of the improved model varies greatly with different kinds of sedimentary rocks and soils. Finally, the improved model is adopted to analyze the differential slaking properties of red beds soft rock in Hunan Province.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第8期1691-1697,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
交通部"九五"行业联合攻关资助项目(95–05–01–45)
关键词
岩石力学
沉积岩
分形模型
粒度分布
搬运
崩解
rock mechanics
sedimentary rock
fractal model
size distribution
transportation
slaking
