岩土力学 ›› 2018, Vol. 39 ›› Issue (12): 4369-4375.doi: 10.16285/j.rsm.2017.2281

• 基础理论与实验研究 • 上一篇    下一篇

不同加载速率Ⅰ型预制裂纹花岗岩断裂特征研究

宋义敏1,邢同振1,吕祥锋2,赵泽鑫1,邓琳琳1   

  1. 1. 北方工业大学 土木工程学院,北京 100144;2. 北京市市政工程研究院 岩土工程技术研究中心,北京 100037
  • 收稿日期:2017-11-16 出版日期:2018-12-11 发布日期:2018-12-31
  • 通讯作者: 吕祥锋,男,1982年生,博士,教授级高级工程师,主要从事地下岩土工程灾害发生理论与控制方面的研究工作。E-mail:lvxiangfeng2006@126.com E-mail: ssyymmok@sina.com
  • 作者简介:宋义敏,男,1972年生,博士,教授,主要从事岩石力学试验和理论方面的教学与研究工作。
  • 基金资助:
    国家自然科学基金项目(No.51474013)

Fracture characteristics of granite with mode-I pre-crack at different loading rates

SONG Yi-min1, XING Tong-zhen1, LÜ Xiang-feng2, ZHAO Ze-xin1, DENG Lin-lin1   

  1. 1.School of Civil Engineering, North China University of Technology, Beijing 100144 China; 2. Geotechnical Engineering Research Center, Beijing Institute of Municipal Engineering, Beijing 100037, China
  • Received:2017-11-16 Online:2018-12-11 Published:2018-12-31
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51474013).

摘要: 以CCD相机配合高速相机搭建试验变形观测系统,开展不同加载速率下含Ⅰ型预制裂纹花岗岩试件的三点弯试验。利用数字散斑相关方法对试验过程采集的数字散斑图像进行分析,对不同加载速率作用下含Ⅰ型预制裂纹花岗岩试件裂纹扩展过程中的变形演化特征、裂纹扩展速率、裂纹尖端张开位移、裂纹张开角以及初始断裂应力强度因子进行研究,研究结果表明:(1)花岗岩试件初始裂纹扩展速率随着加载速率的增加总体呈线性增加趋势;最大扩展速率随着加载速率增加呈现先较快增加后缓慢增加的变化趋势。(2)不同加载速率作用下,花岗岩试件预制裂纹尖端张开位移均呈现非线性缓慢增长-迅速增长-线性增长的变形趋势,且线性增长阶段曲线斜率随着加载速率的增加而增大。(3)随着加载速率的增加,花岗岩试件初始裂纹张开角先逐渐减小后稳定在0.1o~0.13o。(4)随着加载速率的增加,花岗岩试件初始断裂应力强度因子呈指数增长。

关键词: 数字散斑相关方法, 岩石断裂, 裂尖张开位移, 应力强度因子, 裂纹扩展速率, 裂纹张开角

Abstract: The deformation measurement system was built with a CCD camera and a high-speed camera. Experimental tests were conducted on rectangular granite specimens with pre-cracks of mode-I under different loading rates. The speckle images captured in the process of experiments were analysed by the digital speckle correlation method (DSCM). We studied the speed of crack growth, crack-tip opening displacement, crack tip opening angle and crack stress intensity factor (SIF) of granite specimens with pre-cracks of mode-I under different loading rates. The initial speed of the crack growth of granite specimens increases linearly with the loading rate. With the increase of loading rate, the maximum speed crack increased rapidly at first and then slowly. At different loading rates, the crack-tip opening displacement of granite specimens showed three stages of evolution: nonlinear slow growth,rapid growth, and linear growth. In the linear growth stage, the slope of the curve increased with the increase of loading rate. With the increase of loading rate, the initial crack opening angle of granite specimen decreases gradually and then stabilises to 0.1°~0.13°. Before the initial fracture of granite specimens, the SIF value increased exponentially with the increase of loading rate.

Key words: digital speckle correlation method, rock fracture, crack tip opening displacement, stress intensity factor, crack growth rate, crack tip opening angle

中图分类号: 

  • TU454
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