摘要
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。
To study the rock burst mechanism under different stress circumstances and the effect of rock burst on rock internal damage characteristics, the rock burst experiments of specimen under different stresses were conducted by using the independent research and development rock burst experimental device, as the same time, the acoustic test and elastic wave CT technology applied before and after experiment. The experimental results showed that internal damage characteristic of the specimen before and after experiment could reflect directly by using the elastic wave CT imaging, and the loading paths had the major impact on failure characteristic and internal damage characteristic. The expansion phenomenon near the loading surface obviously presented on the specimen like cavity ＂V＂ under the higher unloading pressure stress condition, while, it obviously presented spelling under the lower condition. The internal specimen has larger degree of damage at the higher unloading condition than that at lower unloading.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2014年第11期87-92,108,共7页
Journal of Wuhan University of Technology
基金
高等学校博士学科点专项科研基金(20110143110017)
中央高校基本科研业务费专项资金资助项目(2014-IV-150)
武汉工程大学校基金项目(K201407)
关键词
试件
岩爆
损伤特性
弹性波
CT成像
specimen
rock burst
damage properties
elastic wave
CT imaging
