摘要
粘性土微观结构的定向性是影响粘性土工程地质性质一个十分重要因素。本文介绍了两种粘性土微观结构定量测试新技术,即D/MAX Ⅲ A型全自动组构测角仪和Videolab图像分析系统;系统地提出了四种评价粘性土微观结构定向性的定量表示方法,即各向异性率、概率熵、粘土矿物定向频率分布函数(F(ф))和粘性土团粒定向频率分布函数(Q(α))。最后对江苏淮阴粘土、粉质粘土和粉土三类重塑固结土的微观结构定向性进行了系统分析。研究结果表明,在相同的固结和制样条件下,由于三类粘性土的粒度和成分不同,其定向性有明显差别,同一试样中,片状粘土矿物的定向性与粘性土团粒的定向性常常是不一致的;选取何种定向频率分布函数评价粘性土的各向异性,应视具体的研究内容和土性来决定。研究成果对于建立各向异性粘性土微观力学模型是必不可少的,具有重要意义。
The orientation of microstructures of clayey soils is a very important factor which influences soil engineering properties. In this paper, two quantitative techniques for soil microstructures are introduced, which include the D/MAXIII A autofabric goniometer ad Videolab image processing system. Four quantitative indexes are advanced , including Anisotropy, probability entropy, fre-quancy distribution function of platelet orientation of clay minerals (F(τ) )and frequency distribution function of orientation of clay aggregates (Q(α)). Finally, three kinds of soils, i. e. clay, silty clay and silt in Huaiyin, Jiangsu Province, which are moulded and prepared by same method, are analysed quantitatively. The research results show that there are obvious differences in orientation among these soil samples due to their different grain size and mineral composition. F (τ) and Q(a) of the soil are usually not in agreement. To choose the frequency distribution function for appraising the orientation of soil depends on the study content and soil properties. The research results are of important significance for established the micromechanic model of an-sotropical soil.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1997年第1期36-44,共9页
Acta Geologica Sinica
基金
国家自然科学基金(编号 地准0934
4880139
49272148
49402038)
关键词
粘性土
微观结构
定向性
定量评价
clayey , microstructure . orientation, quantitative appraisal
