循环荷载下花岗岩细观损伤量化试验研究

›› 2011, Vol. 32 ›› Issue (7): 1991-1995.

循环荷载下花岗岩细观损伤量化试验研究

倪骁慧^{1, 2}，朱珍德²，李晓娟^{1, 2}，李志敬²，朱明礼²

1. 绍兴文理学院土木工程系，浙江绍兴 312000；2. 河海大学岩土工程科学研究所，南京 210098

收稿日期:2010-01-05 出版日期:2011-07-10 发布日期:2011-06-30
作者简介:倪骁慧，男，1979年生，博士研究生，主要从事岩石力学方面的研究工作
基金资助:
浙江省教育厅科研基金项目(No.Y201018524)；江苏省研究生培养创新工程项目(No. CX07B_128z)；国家自然科学基金项目(No. 50674040）

Quantitative test study of meso-damage of rock under cyclic load

NI Xiao-hui^{1, 2}，ZHU Zhen-de²，LI Xiao-juan^{1, 2}，LI Zhi-jing²，ZHU Ming-li²

1. Department of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China

Received:2010-01-05 Online:2011-07-10 Published:2011-06-30

摘要/Abstract

摘要： 在循环荷载作用下，花岗岩宏观尺度疲劳破坏是由于细观尺度微裂纹的萌生、发育和贯通引起的，因此对处于细观尺度的微裂隙进行量化分析，对于理解花岗岩的动力特性有一定的意义。利用扫描电镜（SEM）拍摄得到昌江花岗岩的大量细观结构图片，利用数字图像技术对图片进行处理，提取微裂纹的细观几何信息。从矿物晶体和微损伤形式两个角度定量分析了循环荷载作用过程中的细观损伤特征。研究结果表明：①循环荷载作用过程中穿晶裂纹大部分出现在长石晶体内，而云母晶体则以沿晶裂纹为主；②在3类微裂纹中以沿晶裂纹发育速度最快，是疲劳损伤中主要的损伤形式；③沿晶裂纹和穿晶裂纹发展中所消耗能量占微裂纹开裂能量的大部分

关键词: 循环荷载, 量化, 矿物晶体, 微裂纹

Abstract: The failure damage of granite under cyclic load are caused by the propagation and coalescent of cracks at mesoscale; so it is helpful to understand the mechanical behaviours of rock by quantitatively investigating the meso-damage of granite. A great deal of mesostructural images of Changjiang granite in Hainan Province have been obtained by means of scanning electron microscopy(SEM). The mesostructural images of marble are processed by regional growing theory based on image processing technique. The meso-damage information of granite microcracks are obtained from SEM images. Then, the mesostructural information of microcracks is analyzed by statistical theory and the distribution regularities of microcrack parameters are proposed. Quantitative analyses of meso-damage characteristics under cyclic load are made from minerals and microcracks. It is shown that most of transgranular cracks are mainly concentrated within the feldspars and microcracks are initiated as boundary and intragranular cracks around micas. And the major meso-damage of fatigue damage is intragranular cracks. The energy of the development of transgranular cracks and intragranular cracks account for most of the micro-crack initiation energy consumption

Key words: cyclic load, quantification, mineral crystal, microcrack

中图分类号:

TU 458

倪骁慧，朱珍德，李晓娟，李志敬，朱明礼. 循环荷载下花岗岩细观损伤量化试验研究[J]. , 2011, 32(7): 1991-1995.

NI Xiao-hui ，ZHU Zhen-de ，LI Xiao-juan ，LI Zhi-jing ，ZHU Ming-li. Quantitative test study of meso-damage of rock under cyclic load[J]. , 2011, 32(7): 1991-1995.

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