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选择含圆孔岩石作为试样,利用单轴加载试验系统和红外热像仪,并结合数值模拟分析手段,对模型受力及破裂过程的热辐射时空演化特征进行了试验研究。结果表明:含圆孔岩石在加载过程中压、拉应力呈对称分布,导致热像的升温和降温区对称分布,即压应力区升温,拉应力区降温,应力场与红外辐射温度场之间呈很好的对应关系。试件加载后期发生破裂,破裂的性质与红外辐射温度变化有密切关系,剪性破裂辐射温度升高,而张性破裂辐射温度无明显变化。试件最终呈剪性破裂,而该区域的带状升温是岩石破裂失稳的重要红外前兆。试验结果再次揭示,利用热成像技术可以监测岩石的应力与灾变现象。
The round rock is chosen as the sample. The uniaxial loading test system and infrared thermal imager are used in combination with the numerical simulation analysis method to study the temporal and spatial evolution characteristics of the thermal radiation during the stress and rupture of the model. The results show that the compressive and tensile stresses of the rock with round holes are symmetrically distributed during the loading process, resulting in the symmetrical heating and cooling zones of the thermal image. That is, the compressive stress zone is heated, the tensile stress zone is cooled, and the stress field and infrared radiation temperature field Was a good correspondence. The nature of the rupture and rupture occurred at the later stage of specimen loading was closely related to the temperature change of infrared radiation. The radiation temperature of shear rupture increased while the temperature of tension rupture did not change significantly. The specimen finally became shearing rupture, while the ribbon warming in this area is an important infrared precursor to rock rupture. The test results reveal once again that the use of thermal imaging technology can monitor rock stress and catastrophic phenomena.