矿物成分对沉降分析法影响的试验研究  

Experimental Research on the Influence of Mineral Composition on Sedimentation Analysis Method

作　　者：谷任国[1] 朱奕曜 房营光[1] 王培旭 Gu Renguo;Zhu Yiyao;Fang Yinggaung;Wang Peixu(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学土木与交通学院,广州510641

出　　处：《科技通报》2022年第1期97-102,108,共7页Bulletin of Science and Technology

基　　金：国家自然科学基金(51208211);华南理工大学亚热带建筑科学国家重点实验室自主研究项目(2017kb16)。

摘　　要：土颗粒矿物成分不同,其颗粒形状和表面物理化学特性不同,因而其在水溶液中的沉降速率不同,将对颗粒粒度成分的沉降分析法结果产生影响,目前这方面的研究很少。本文采用激光散射法和沉降分析法对相同目数的石英、长石、高岭石和蒙脱石试样进行了颗粒粒度分布的对比试验,探讨不同矿物成分对沉降分析法的影响。试验结果表明,分别用激光散射法和沉降分析法测得的非黏土矿物石英、长石颗粒粒度分布曲线特征差异不大,而黏土矿物高岭石和蒙脱石的差异显著,分析表明黏土矿物颗粒表面吸附水膜会影响颗粒的等效密度进而影响颗粒的沉降速率,另外黏土矿物颗粒为片状,偏离沉降分析法中的颗粒形状为球体的假设,也是导致沉降分析法所得颗粒粒度分布曲线与激光散射法所得曲线差异显著的原因。本文研究成果可为沉降分析法的完善提供参考。As The mineral composition of soil particles is different, and their particle shape and surface physical and chemical properties are different, so their sedimentation rate in aqueous solution will be different, which will affect the results of sedimentation analysis method of particle size composition. At present, there are few studies in this area. In this paper, the laser scattering method and the sedimentation analysis method are used to compare the particle size composition of the quartz, feldspar, kaolinite and montmorillonite samples of the same mesh to discuss the influence of different mineral components on the sedimentation analysis method. The test results show that the particle size distribution curves of the non-clay minerals quartz and feldspar measured by the laser scattering method and the sedimentation analysis method have little difference, while the clay minerals kaolinite and montmorillonite have significant differences. The analysis shows that the water film adsorbed on the surface of clay mineral particles will affect the equivalent density of particles, and then affect the sedimentation rate of particles. In addition, the clay mineral particles are flakes, which deviate from the assumption that the particle shape in the sedimentation analysis method is spherical, which is also the reason for the significant difference between the particle size distribution curve obtained by the sedimentation analysis method and the curve obtained by the laser scattering method. The research results of this paper can provide a reference for the improvement of the settlement analysis method.

关 键 词：颗粒沉降 粒度分布 激光散射法 沉降分析法 

分 类 号：TU411.2[建筑科学—岩土工程]