温度循环荷载下花岗岩微裂隙演化试验

花岗岩力学性能随环境温度的变化是岩石力学领域的热点问题,其微细观结构随温度的演化规律尚不清晰。本研究基于现代化测试技术和实验设备设计了等幅值温度循环和峰值递增温度循环荷载,关注其作用下花岗岩微裂隙的衍生和扩展规律,并讨论了风化程度的影响。研究结果表明峰值温度比循环次数对裂隙网络发展的影响更大,峰值递增的温度循环可促进表面裂隙的衍生,而风化在一定程度上可减弱温度荷载的影响。本研究可促进对温度作用下岩石力学性能演化的认知。

Experimental study on the evolution of micro-cracks in granite under thermal cyclic loading

The evolution of granite''s mechanical characteristics with temperature is a contentious topic in the field of rock mechanics, and little research has been done on how its microstructures vary with temperature. In this study, the design of the constant amplitude temperature cycle and peak increasing temperature cycle loads was based on modern testing technology and experimental apparatus, with a particular emphasis on the generation and propagation law of granite microcracks under their action and a discussion of the influence of weathering degree. The results suggest that the peak temperature has a stronger influence on the formation of the fracture network than the total number of cycles.Temperature load can be slightly mitigated by weathering, but a thermal cycle with an increasing peak value can promote the growth of surface fracture.The understanding of the evolution of rock mechanical properties under temperature will be promoted in this study.