基于图像重建方法的岩体损伤形态表征研究*

工程岩体内部的损伤形态难以表征。基于图像三维重建,结合数字图像处理技术、数值模拟,重建岩体损伤模型,通过对指定数值模型剖面图的损伤区域进行图像辨识和量化,重建岩体内部损伤的三维形态。结果表明:(1)所重建的三维损伤模型具有良好的可观察性,能够直观地观察到在复杂应力条件下岩体内部模型损伤结构的起裂位置和发展形态;(2)重建模型较好地量化了岩体损伤的程度、预测了损伤区域的发展;(3)重建方法不受尺寸效应约束,具有良好的适用性。研究成果对于认识岩体损伤演化行为、分析工程问题具有一定的参考意义。

Study on Rock Damage Morphology Characterization Based on Image Reconstruction Method

The damage pattern in engineering rock mass is difficult to characterize. Based on image 3D reconstruction technology,combined with digital image processing technology and numerical simulation, the damage model of rock mass is reconstructed. By image identification and quantization of the damage area in the section of the specified numerical model, the 3D damage shape of rock mass is reconstructed. The numerical simulation results show that: (1) the reconstructed 3d damage model has good observability, and can intuitively observe the crack initiation position and development pattern of the damage structure of the rock mass under complex stress conditions; (2) the reconstruction model quantifies the damage degree of rock mass and predicts the development of the damage area.(3) the reconstruction method is not constrained by size effect and has good applicability. The research results have certain reference significance for understanding the evolution behavior of rock mass damage and solving engineering problems.