中山大学学报自然科学版 ›› 2017, Vol. 56 ›› Issue (6): 15-21.

• 论文 • 上一篇    下一篇

花岗岩残积土颗粒及水分形态三维微观结构

李中森,汤连生,桑海涛   

  1. 中山大学地球科学与工程学院,广东 广州 510275
  • 收稿日期:2016-09-11 出版日期:2017-11-25 发布日期:2017-11-25
  • 通讯作者: 汤连生(1963年生),男;研究方向:岩土力学;E-mail: eestls@mail.sysu.edu.cn

LI Zhongsen, TANG Liansheng, SANG Haitao   

  1. School of Earth Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
  • Received:2016-09-11 Online:2017-11-25 Published:2017-11-25

摘要:

采用高分辨率X射线计算机断层扫描技术(X-ray μ-CT)对花岗岩残积土三维微观结构进行重构并在以下方面取得新进展:① 通过在试样液相中添加显影物质(CsCl),成功获取土中水分形态及空间分布;② 利用X射线在不同物质中的衰减率差异,进一步区分固体颗粒中高岭石与石英并确定各自空间分布;③ 通过三维重构图像,对颗粒空间接触关系进行初步概化与分类,同时对X射线计算机断层扫描技术在非饱和土力学中的进一步应用做了前瞻。这些初步探索将有助于对土体三维真实结构的全面认识,促进计算机断层扫描技术在岩土/地质工程领域的新开拓。

关键词: 花岗岩残积土, 计算机断层扫描, 三维微观结构重构, 水分形态, 颗粒接触关系

Abstract:

The high-resolution X-ray micro-computed tomography (μ-CT) is used to investigate 3-D micro-structure of granitic residual soils. The results showed that: ① The water phase and their spatial distribution in soils can be determined by mixing the dried soil sample with CsCl solution. ② X-ray attenuation coefficient differentiation in different materials leads to easily distinguishing kaolinite and quartz in soils. ③ The spatial contact and orientation of soil particles are generalized and classified by using the reconstructed 3-D images. In addition, some further applications of the X-ray μ-CT to the study of unsaturated soil mechanics are predicted. These preliminary findings will contribute to the better understanding of the 3-D real structure of soil and to fostering new progresses of the X-ray μ-CT in geotechnical/geological engineering.

Key words: granite residual soil, X-ray micro-computed tomography, 3-D micro-structure reconstruction, water morphology, soil particles spatial contact

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