软岩巷道变形破坏红外温度场的分形特征

Fractal Characteristics of Infrared Radiation Temperature Field for Deformation and Failure of Soft Rock Roadway

根据软岩巷道模型加载过程的红外热图,研究了红外辐射温度场的分形性质,计算了红外热图的分形维数并研究了其物理意义,通过对分形维数时间过程的分析得到了软岩巷道变形破坏的规律。红外热图的分形维数不仅表达了软岩巷道变形过程中裂纹的复杂性、裂隙的形态、尺度等的几何特征,也表达了其动力学特征。研究结果表明:可以根据红外热图的分维数对岩石的变形特征、损伤破坏程度、以及破坏前兆进行分析、评价与预报。

According to the thermal infrared images which were obtained from a model tests for soft rock roadway under loading, fractal analyses were made on the infrared radiation temperature field, the fractal dimensions of thermal infrared images were calculated and their implications were studied. Through carefully examining the changes of fractal dimensions with time, the laws of deformation and failure of the soft rock roadway were revealed. The fractal dimensions from thermal infrared images can denote the complexity, the patterns and the scale of the cracks and fractures in geometry, and the temporal curves of the fractals can also denote the dynamic characteristics during the deformation process of soft rock roadway. The studied results demonstrate that the fractal dimensions from thermal infrared images can used to analyze, estimate and predict the deformation and damage - failure of rock and forewarning of its damage.