不同频率循环荷载作用下花岗岩细观疲劳损伤量化试验研究

›› 2012, Vol. 33 ›› Issue (2): 422-427.

不同频率循环荷载作用下花岗岩细观疲劳损伤量化试验研究

倪骁慧^{1, 2, 3}，李晓娟^{1, 2, 3}，朱珍德^{2, 3}，杜时贵^{1, 4}

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； 3.河海大学岩土力学与堤坝工程教育部重点实验室，南京 210098；4.浙江工业职业技术学院，浙江绍兴 312000

收稿日期:2010-07-16 出版日期:2012-02-10 发布日期:2012-02-14
作者简介:倪骁慧，男，1979年生，博士，讲师，主要从事岩石力学方面的工作。
基金资助:
国家自然科学基金项目（No. 41172292）；浙江省教育厅科研计划资助项目（No. Y201018524）；绍兴文理学院校级科研项目。

Quantitative test study of meso-damage of granite under cyclic load with different frequencies

NI Xiao-hui^{1, 2, 3}, LI Xiao-juan^{1, 2, 3}, ZHU Zhen-de^{2, 3}, DU Shi-gui^{1, 4}

1. Department of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China; 3. Key Laboratory of Ministry of Education for Goemechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 4. Zhejiang Industry Polytechnic College, Shaoxing, Zhejiang 312000, China

Received:2010-07-16 Online:2012-02-10 Published:2012-02-14

摘要/Abstract

摘要： 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，所以对处于细观尺度的微裂纹特征进行量化分析，对于理解花岗岩的动力特性有一定的意义。首先利用RMT-150B多功能全自动刚性岩石伺服试验机，采用振幅为10 MPa，频率分别为0.01、0.02、0.05、0.10、0.20、0.50、1.00 Hz的正弦循环荷载作为动力扰动，对海南昌江花岗岩试样进行单轴循环荷载试验。然后，利用扫描电镜（SEM）拍摄得到花岗岩的大量细观结构图片，运用数字图像技术获取微裂纹的细观几何信息，从方位角、长度、宽度和面积对不同荷载频率相应的花岗岩细观尺度微裂纹特征进行量化分析。研究结果表明，随着循环荷载频率的增加，微裂纹方位角发育离散性增加，而其统计均值则在某一区间内波动；微裂纹长度的发育则较快，而仅当荷载频率达到1 Hz时，宽度才有一定的发展，同时，能量耗散的方式也发生一定的变化。

关键词: 不同频率, 循环荷载, 微裂纹, 量化

Abstract: The failure damage of granite under cyclic load is caused by the propagation and coalescent of cracks at mesoscale, so it is helpful to understand the mechanical behaviours of rock by quantitatively investigating on meso-damage of granite. The uniaxial cyclic fatigue tests on granite coming from Changjiang of Hainan province are done on the RMT-150B multi-function automatic rigid rock servo material testing machine. Stress amplitude of 10 MPa and sine wave cyclic loads with five different frequencies of 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, 1 Hz are adopted as dynamic disturbance. 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 is obtained from SEM images. Quantitative analysis of meso-damage characteristics under cyclic fatigue load is made from angle, length, width and area. It is shown that with the frequency of cyclic load increasing, the dispersion of microcrack growth azimuth value increases and the average of microcrack growth azimuth value fluctuates in the range. The development of microcrack length is fast; but only when the frequency is 1 Hz, the microcrack width begins to develop and the method of energy dissipation changes.

Key words: different frequencies, cyclic load, microcrack, quantification

中图分类号:

TU 458

倪骁慧，李晓娟，朱珍德，杜时贵. 不同频率循环荷载作用下花岗岩细观疲劳损伤量化试验研究[J]. , 2012, 33(2): 422-427.

NI Xiao-hui , LI Xiao-juan , ZHU Zhen-de , DU Shi-gui. Quantitative test study of meso-damage of granite under cyclic load with different frequencies[J]. , 2012, 33(2): 422-427.

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