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为研究不同应力环境下深部岩体的岩爆机制及岩爆产生对围岩体内部损伤特性的影响,通过自主研发的岩爆加卸载装置对试件进行不同加卸载路径下的岩爆试验,并在试验前后对试件进行声波测试和CT成像,分析不同加卸载路径下岩爆岩体的内部损伤特性。结果表明:弹性波CT成像能直观地反应试件内部的损伤情况,加卸载路径对岩爆岩体的破坏形态和内部损伤特性具有较大影响;当试件在高应力条件下卸载时,试件卸载面的破坏形态呈“V”形凹腔,试件内部的损伤区域分布在卸载面附近;当试件在低应力条件下卸载时,试件卸载面呈层裂破坏;试件在高应力条件下卸载时,试件内部岩体的损伤度相对比其在低应力环境下的损伤度高。
In order to study the rockburst mechanism of deep rock mass under different stress environments and the effect of rockburst on the internal damage characteristics of rock mass, the rockburst test under different loading and unloading paths was carried out by the rockburst loading and unloading device, The acoustic wave and CT imaging of the specimen were conducted before and after the test. The damage characteristics of the rock mass under different loading and unloading paths were analyzed. The results show that the elastic wave CT imaging can intuitively reflect the damage inside the specimen. The loading and unloading paths have a great influence on the failure morphology and internal damage characteristics of the rock mass. When the specimen is unloaded under high stress, The failure form of the unloading surface is “V” shaped cavity, the damage area inside the specimen is distributed in the vicinity of the unloading surface; when the specimen is unloaded under low stress conditions, the unloading surface of the specimen is delaminated; When unloaded under high stress conditions, the damage degree of rock mass inside the specimen is relatively higher than that under low stress environment.