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为探讨岩石加载过程表面红外辐射温度场演化的定量分析方法,引入分形、熵和统计学理论,提出用特征粗糙度、熵和方差作为指标定量描述岩石加载过程中红外辐射温度场的演化特征,并以含孔岩石试样加载过程热成像观测试验结果为例,对3种指标的定量刻画能力及特点进行对比分析。结果表明:(1)3种指标都能较好地定量刻画岩石加载过程中红外辐射温度场的演化与分异特征,在岩石加载过程中随着应力变化出现阶段性变化特征,在破坏前出现红外异常前兆,且效果均好于以往使用的指标AIRT;(2)3种指标有不同的特点,熵对于试样加载过程红外辐射的阶段性特征刻画较好,随应力增加各个阶段的红外辐射变化分界明显;而特征粗糙度和方差在临近岩石破裂时发生大幅度突然性升高,对于岩石破裂的红外前兆的识别更具优势。研究结果为岩石受力与灾变过程红外辐射的定量分析提供了新的方法。
In order to explore the quantitative analysis of temperature field evolution of infrared radiation on rock loading process, fractal, entropy and statistical theory are introduced. The evolution characteristics of infrared radiation temperature field during rock loading are quantitatively described by using characteristic roughness, entropy and variance as indices. Taking the results of the thermal imaging observation experiment of loading process of rock sample containing holes as an example, the quantitative characterization ability and characteristics of three kinds of indexes are compared and analyzed. The results show that: (1) All three indexes can quantitatively characterize the evolution and differentiation of the infrared radiation temperature field during the rock loading process, and appear in the rock loading process as the stress changes appear in stages before the failure Infrared anomalous precursors, and the results are better than the previously used indicators AIRT; (2) The three kinds of indexes have different characteristics. The entropy has a good characterization of the stage characteristics of the infrared radiation during loading of the sample. With the increase of the stress, the infrared radiation And the demarcation is obvious. However, the characteristic roughness and variance increase sharply and sharply near the rock rupture, which is more advantageous to the identification of rock rupture infrared precursors. The results provide a new method for the quantitative analysis of infrared radiation in rock stress and catastrophe processes.