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采用双轴伺服实验机开展不同加载速率下花岗岩巷道岩爆模拟实验,分别采用红外热像技术和岩石颗粒筛分方法获取花岗岩巷道岩爆岩石碎屑温度和不同粒度等级岩屑质量,重点研究速率效应影响下巷道岩爆岩石碎屑温度变化特征和碎屑粒度-质量分布规律,揭示不同加载速率条件下的巷道岩爆破坏特征。研究结果表明:随着加载速率的增加,花岗岩巷道岩爆产生的岩石碎屑温度随之升高、质量随之增大,说明加载速率的增加促进了巷道围岩损伤破坏;随着加载速率增大,微粒岩屑质量占比保持不变,细粒岩屑和中粒岩屑质量占比随之减小,粗粒岩屑质量占比随之增大,说明加载速率增大,岩爆过程中用于切割岩块的能量占比减小,转化为其他形式的能量占比增大。
The experiments of rockburst in granite roadway under different loading rates were carried out by using biaxial servo experimental machine. The temperature of rock detritus and granulite rock mass of different granularity grade in granite roadway were obtained by infrared thermal imaging technology and rock particle screening method. The key research rate Effect of rock demolition rock detritus temperature changes and debris particle size - mass distribution under rock excavation conditions to reveal the rock burst damage characteristics under different loading rates. The results show that with the increase of loading rate, the temperature of rock debris produced by rockburst in granite roadway increases with the increase of mass fraction, which indicates that the increase of loading rate can promote the damage of surrounding rock of tunnel. With the increase of loading rate The proportion of large and small particles of cuttings remains unchanged, the proportion of fine cuttings and medium cuttings decreases, and the proportion of coarse cuttings increases, which indicates that the loading rate increases and the rockburst process The proportion of energy used to cut the rock mass is reduced, and the proportion of energy converted to other forms is increased.