数字图像相关法测定岩石Ⅰ-Ⅱ复合型裂纹应力强度因子  

Evaluation of mixed-mode Ⅰ-Ⅱ stress intensity factors of rock utilizing digital image correlation method

作　　者：代树红[1] 马胜利[2] 潘一山[1] 

机构地区：[1]中国地震局地质研究所地震动力学国家重点试验室,北京100029 [2]辽宁工程技术大学力学与工程学院,辽宁阜新123000

出　　处：《岩土工程学报》2013年第7期1362-1368,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(41002075);地震动力学国家重点实验室项目(LED2008B08);清华大学水沙科学与水利水电工程国家重点实验室项目(sklhse-2012-c-03)

摘　　要：提出了一种通过数字图像相关方法测定岩石Ⅰ-Ⅱ复合型裂纹尖端位置和应力强度因子的试验方法。试验通过数字图像相关方法测定裂纹尖端区域位移场数据,将位移场数据带入极坐标系下位移场方程,计算裂纹尖端位置和应力强度因子。试验结果表明:采用该方法可以准确的测定岩石Ⅰ-Ⅱ复合型裂纹应力强度因子、裂纹尖端位置及裂纹扩展长度,解决了以往研究方法因不能准确测定裂纹尖端位置和扩展方向,而无法准确测定岩石应力强度因子的难题。A method for determining the mixed-mode Ⅰ-Ⅱ stress intensity factors and crack tip position of rock specimens by the digital image correlation method is proposed.The notched semicircular disk rock specimen under three-point bending is used in the rock fracture tests,the displacement field around the crack tip is measured by the digital image correlation method,and nonlinear displacement field equations with unknown parameters are solved by the nonlinear method.The characters of rock specimen fracture and crack propagation are studied based on the analysis of stress intensity factors and crack extension length.The experimental results show that the mixed-mode Ⅰ-Ⅱ stress intensity factors and crack tip position of rock can be evaluated accurately from the displacement components by the proposed method.

关 键 词：数字图像相关方法 Ⅰ-Ⅱ复合型裂纹应力强度因子 裂纹扩展长度 岩石断裂 

分 类 号：TU455[建筑科学—岩土工程]