载荷岩石材料在加载-卸荷扰动作用下声发射特性  

Acoustic emission character of loaded rock under load-unload disturbance

作　　者：纪洪广[1] 侯昭飞[1] 张磊[1] 孔凡标[1] 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083

出　　处：《北京科技大学学报》2011年第1期1-5,共5页Journal of University of Science and Technology Beijing

基　　金：国家高技术研究发展计划重点资助项目(No.2008AA062104);国家重大基础研究发展计划资助项目(No.2010CB226803);国家科技支撑计划资助项目(No.2008BAB33B03)

摘　　要：通过在不同应力水平下对岩石试样的加载-卸荷实验,对岩石试件在不同应力状态下受到"加载-卸荷"扰动时的声发射特征进行了试验研究.结果表明:在较低的应力水平下,岩体在受到加载作用时,会产生少量离散的声发射,而在卸载过程中几乎不产生声发射;而在较高的应力水平下,在受到加载扰动作用时,声发射活动相对活跃,而且在卸载时也有明显声发射信号出现.因此,在不同应力水平和应力状态下的声发射信号所反映的是材料不同的本构特征,在进行地下工程原位岩体的稳定性检测与评价时,必须考虑这种特性.Based on load-unload experiment, the acoustic emission （AE） character of rock samples under load-unload disturbance was studied and tested under different stress levels. The results show that under a low stress level, there are several discrete AE signals when the rock sample is loaded, and almost no AE signals during unloading; under a high stress level, AE is active relatively under load disturbance, and there are obvious AE signals even during unloading. AE signals under different stress levels and stress states refleet different constitutive properties of rock materials. This characteristic must be considered in the stability testing and evaluation of underground engineering in-situ rock mass.

关 键 词：岩石力学 岩石 加载 卸载 扰动 声发射 

分 类 号：TD315[矿业工程—矿井建设]