Author:
Chai Jing,Ouyang Yibo,Liu Jinxuan,Zhang Dingding,Du Wengang,Yang Jianfeng,Liu Yongliang,Ma Zhe
Abstract
AbstractTo overcome the limitation of the virtual extensometer method in measuring the crack opening displacement (COD) in the process of complex multi-crack propagation of rock, the measurement error of Digital Image Correlation (DIC) local deformation is theoretically analyzed. An improved virtual extensometer method for measuring the COD is proposed, which considers the temporal and spatial characteristics of crack development in the process of complex crack propagation. The accuracy of the proposed method is verified by the strain localization band numerical simulation test and indoor single crack simulation test. Furthermore, the method is applied to the two-dimensional similarity simulation test of simulating complex multi-fractures in rock stratum. The COD obtained by the traditional and improved methods is compared with the measured COD. The results show that in the case of multiple complex cracks, to obtain the COD accurately, the relative distance between the virtual extensometer measuring point and the crack should be greater than half of the sum of the width of the crack strain localization zone and the subset size. With the development of the crack, the relative distance between the virtual extensometer measuring point and the crack should increase with the increase of the width of the crack strain localization zone. The error of the COD measured by the traditional method increases with fracture development, and the maximum is 21.20%. The maximum relative error between the COD measured by the improved method and the measured crack opening is 3.61%. The research results improve the accuracy of the virtual extensometer in measuring the COD under complex multi-crack conditions.
Funder
National Natural Science Foundation of China
Publisher
Springer Science and Business Media LLC
Reference42 articles.
1. Wu, H., Zhao, G. & Liang, W. Investigation of cracking behavior and mechanism of sandstone specimens with a hole under compression. Int. J. Mech. Sci. 163, 105084 (2019).
2. Lin, P., Liu, H. & Zhou, W. Experimental study on failure behaviour of deep tunnels under high in-situ stresses. Tunnel. Undergr. Space Technol. 46, 2 (2022).
3. Huang, F. et al. Experimental analysis of progressive failure behavior of rock tunnel with a fault zone using non-contact DIC technique. Int. J. Rock Mech. Min. Sci. 132, 104355 (2022).
4. Yang, X., Jing, H. & Chen, K. Numerical simulations of failure behavior around a circular opening in a non-persistently jointed rock mass under biaxial compression. Int. J. Min. Sci. Technol. 26, 729–738 (2016).
5. Cai, M. et al. Generalized crack initiation and crack damage stress thresholds of brittle rock masses near underground excavations. Int. J. Rock Mech. Min. Sci. 41(5), 833–847 (2004).
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献