不同温度影响后砂岩的断裂特性研究

It is important to study mechanical characteristics of rocks to meet the increasing demands of deep mining and nuclear waste disposal. The paper mainly studied different temperature effects on fracture toughness of double notches sandstone sample through meso-experiments. Experimental results indicated that fracture toughness increased exponentially with the temperature increment from 25℃ to 150℃, and decreased exponentially with the temperature increment from 150℃ to 300℃, 150℃ is the critical temperature. The result differs with the most macroscopic experimental results. The possible reasons, such as meso-scale, clay mineral and thermal cracking are, were analyzed t in detail.