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冰川冻土 ›› 2000, Vol. 22 ›› Issue (3): 218-222.

• 研究论文 • 上一篇    下一篇

CT技术应用于岩石实验动态观测的新进展

丁卫华1,2, 仵彦卿1,2, 蒲毅彬1, 廖全荣1   

  1. 1. 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室, 甘肃兰州730000;
    2. 西安理工大学, 陕西西安710048
  • 收稿日期:1999-12-28 修回日期:2000-04-25 出版日期:2000-08-25 发布日期:2012-04-26
  • 基金资助:
    中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室项目(9803)资助

New Progress in Real-time Detecting of Geotechnical Experiment by Use of X-ray Computed Tomography

DING Wei-hua1,2, WU Yan-qing1,2, PU Yi-bin1, LIAO Quan-rong1   

  1. 1. State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou Gansu 730000, China;
    2. Xi’an University of Technology, Xi’an Shanxi 710048, China
  • Received:1999-12-28 Revised:2000-04-25 Online:2000-08-25 Published:2012-04-26

摘要: 首先分析了岩石实验的CT动态观测现状,提出了密度损伤增量新概念.从理论上推导出CT数H与密度损伤增量的定量关系,应用密度损伤增量定量分析图像特征,并与基于灰度变化的传统的CT图像分析方法作了对比,说明密度损伤增量的优越性在于物理含义明确,可以定量刻划岩石任意应力状态.任意位置的损伤程度.借助于CT技术,密度损伤增量的量测得到实现,从而真实地观测到岩石细观损伤过程.

关键词: CT, 动态观测, CT图像, 密度损伤增量, 密度损伤增量图像

Abstract: In this paper the current status of real-time detecting in geotechnical experiment by use of CT is analyzed and a new concept, density damage increment, is proposed. On the basis of X-ray physics and the hypothesis that mineral can not be compressed, a relationship between CT number of a pixel and the density damage increment of a corresponding volume element is deduced. The advantage of the new concept is that it has definite physical senses and can quantitatively describes the damage degree of a rock at any stress state and at any location. The density damage increment image is analyzed with the new concept, and several conclusions can be come. The first conclusion is that in one △Dimage the density variation of every corresponding volume element comparing with the initial one can be read. The second conclusion is that the △Dvalue in one △Dimage varies very much, which is very important in the rock mass engineering analysis that can provide more damage information at most location of the rock. The third conclusion is that the △Dimage can distinguish better than the traditional CT image analysis method. Be-cause the detecting of the density damage increment can be realized, a real meso-damage process of rock can be detected and some good experiment data will be obtained for the relation between the meso-damage process and the macroscopy constitutive law of a rock. A new progress of using CT in geotechnical experiment is made.

Key words: CT, real-time detecting, CT image, density damage increment, density damage increment image

中图分类号: 

  • P642.14