Analysis of gradual damage breakage properties of red sandstone with digital image technique

ZHU Zhen-de; ZHANG Yong; CHEN Wei-zhong

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Analysis of gradual damage breakage properties of red sandstone with digital image technique

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- Analysis of gradual damage breakage properties of red sandstone with digital image technique
- Vol. 26, Issue 2期　刊出日, (2005)
- 作者机构：
  
  1. 中国科学院武汉岩土力学研究所岩土力学重点开发实验室,湖北,武汉,430071
  2. 河海大学岩土工程研究所,江苏,南京,210098
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU452
- Online First：19 November 2013，
  
  Published：2005
- 稿件说明：
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ZHU Zhen-de, ZHANG Yong, CHEN Wei-zhong. Analysis of gradual damage breakage properties of red sandstone with digital image technique[J]. 2005, 26(2期　刊出日).
DOI：

ZHU Zhen-de, ZHANG Yong, CHEN Wei-zhong. Analysis of gradual damage breakage properties of red sandstone with digital image technique[J]. 2005, 26(2期　刊出日). DOI：

摘要

为了分析含水状态下红砂岩渐进破坏行为，在已有的岩石细观加载仪上配置数字显微观测系统，对试件表面的裂纹扩展过程进行多角度的实时全场监测和局部显微放大监测，并将可监视到的图像进行录像和计算机自动采集处理。利用该系统进行了红山窑水利枢纽工程地基红砂岩在不同含水率条件下的单轴压缩破裂过程试验，应用数字图像相关技术处理试样表面细观裂纹萌生、扩展图像灰度分布图，去除伪裂纹，探讨了红砂岩动态损伤状态与其宏观力学响应之间的关联。为了获得试样表面裂纹萌生、扩展的定量描述，引入表观裂损度与损伤张量2个物理量，定量评价含水状态下红砂岩渐进损伤破坏特性，进一步分析单轴压缩状态下岩石裂纹损伤演化规律。

Abstract

In order to study on gradual breakage action of red sandstone in different water contents

rock microcosmic loading apparatus is configured with digital microcosmic observation system. And it can carry out several angles real-time whole and local magnifying monitoring to crack of specimen surface with monitor. Moreover monitored images can be recorded and collected automatically with computer. By this system

red sandstone of Hongshanyao Hydraulic Project in water state. The uniaxial compression experiment is carried out. Images of crack engendering and developing are analyzed by digital image technique for discussing the intrinsic relation between crack process and nonlinear deformational responses. In order to obtain quantitative description of crack development

two physical quantities of damage tensor and crack degree are proposed

which can appraise quantitatively gradual breakage properties of red sandstone in water state and furthermore analyze the law of rock crack damage evolution under uniaxial compression.

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