摘要
为了研究深部工程受不同扰动的变形破坏特性,以某深部铁矿花岗岩为研究对象,采用QKX-YB200伺服真三轴岩爆试验仪,对试样施加2种不同动力扰动,进行"预静载+动力扰动"下围岩破坏试验。研究结果表明:试样在动力扰动作用下,存在发生岩爆的阈值(轴向静应力比为90%),当轴向应力超过该阈值时,岩爆很快发生,且随着轴压持续增大,岩爆的频度和破坏程度加剧。在相同的预静载下,试件岩爆的发生受不同动力扰动影响显著,不规律的扰动更容易诱发岩爆。在地震波扰动下试样受轴压影响更大,地震波扰动更容易诱发岩爆。
In order to study the deformation and failure characteristics of deep engineering under different disturbances,the granite of a deep iron ore was taken as the research object.Through applying two different dynamic disturbances to the samples,the surrounding rock failure tests under pre-static load+dynamic disturbance were carried out by QKX-YB200 servo true triaxial rock burst tester.The results show that,under the action of dynamic disturbance,there is a rock burst threshold,that is,the axial static stress ratio is 90%.When the axial stress exceeds the threshold,rock burst occurs quickly,and with the continuous increase of axial stress,the frequency and damage degree of rock burst increase.Under the same pre-static load,the occurrence of rock burst is significantly affected by different dynamic disturbances,and irregular disturbances are more likely to induce rock burst.Under the disturbance of seismic wave,the axial stress has a large influence on the samples,and the rock burst is more easily induced by the disturbance of seismic wave.
作者
李占金
杨铭
程豪杰
李群
LI Zhanjin;YANG Ming;CHENG Haojie;LI Qun(School of Mining Engineering,North China University of Science and Technology,Tangshan,Hebei 063210,China;Development and Safety Technology Key Lab of Hebei Province,Tangshan,Hebei 063009,China)
出处
《矿业研究与开发》
CAS
北大核心
2021年第5期53-58,共6页
Mining Research and Development
基金
国家自然科学基金项目(51374088)
河北省自然科学基金项目(E2015209176).
关键词
深部工程
扰动波
动静组合加载
真三轴试验
岩爆
Deep engineering
Disturbance wave
Coupled static and dynamic loads
True triaxial test
Rock burst
