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利用LEICA DM4500P偏光显微镜对实时温度作用下山东临沂花岗岩的细观形态进行了观测,结合其在高温下单轴压缩与声发射检测试验结果,对不同温度下花岗岩的强度和声发射与细观结构形态关系进行了初步的探讨。研究表明,高温下花岗岩细观结构形态的变化主要体现在不同温度下裂纹萌生及扩展速度的不同;随温度的升高,花岗岩内部形成的裂纹越多,内部损伤越严重,单轴压缩下其声发射活动越频繁;花岗岩的力学特性及声发射特征与岩样内部裂纹网络的形成具有对应的关系,裂纹扩展缓慢则其峰值应力曲线和振铃累计数曲线走势平稳,而裂纹网络急剧扩展则峰值应力曲线和振铃累计数曲线出现拐点导致突变。通过观测岩石在热作用下内部结构形态的变化,以期推断其在热破裂过程中物理力学特征参量发生变化的原因。
Using the LEICA DM4500P polarizing microscope, the mesoscopic morphology of the granite in Linyi, Shandong Province, was observed under the real-time temperature. Combined with its uniaxial compression and acoustic emission at high temperature, the effects of different temperatures on granite strength, acoustic emission and mesostructure Morphological relations were discussed. The results show that the changes of the morphology of granite under high temperature are mainly caused by the different initiation and propagation velocities of the cracks at different temperatures. The more cracks are formed in the granite and the more the internal damage is, The more frequent the acoustic emission occurs. The mechanical characteristics and acoustic emission characteristics of granite have a corresponding relationship with the formation of crack network in the rock specimen. The slow crack propagation results in a steady trend of peak stress curve and ringing cumulative number curve, while the crack network expands rapidly An inflection point occurs in the peak stress curve and ringing cumulative curve leading to a mutation. By observing the change of the internal structure of the rock under the action of heat, the reasons for the change of the physical and mechanical characteristic parameters during the thermal rupture are deduced.