摘要
针对红透山铜矿采场顶板含不同角度节理岩体问题,将含有天然弱面辉绿岩试件进行单轴压缩声发射试验研究。研究结果表明:(1)含有纵向弱面辉绿岩试件比含横向弱面试件强度大,含有三角形斜向弱面抗压强度最低,在相同应力下,含纵向弱面试件轴向应变会比完整试件的应变变化小,含横向贯通弱面试件的轴向应变会比完整试件的应变变化大,横向应变变化相反;(2)完整试件和含天然横向弱面试件在受压时试件为脆性断裂破坏,含纵向弱面试件在受压时为沿弱面拉伸破坏,含有斜向三角弱面试件破坏为沿弱面剪切破坏;(3)含有纵向弱面辉绿岩试件声发射信号与完整试件压缩时产生的声发射信号相近,含有斜三角弱面试件声发射信号非常活跃,试件撞击率出现几次阶段峰值,含双横向弱面试件受到抗压比含单横向弱面试件声发射信号更活跃;(4)此试验可为采场内含有结构面岩体开挖支护提供指导意见,研究结果可以反应含不同弱面试件受加载变形和强度特性及破坏模式。
Aiming at the problem of jointed rock mass with different angles in the stope roof of Hongtoushan Copper Mine,the acoustic emission test of diabase specimens with natural weak faces was carried out under uniaxial compression.Research results have shown that:(1)The diabase specimens with longitudinal weak plane have higher strength than those with transverse weak plane,and the oblique weak plane with triangle is the lowest compressive strength.Under the same stress,the axial strain of the specimen with longitudinal weak penetration will change less than that of the complete specimen,while the axial strain of the specimen with transverse weak penetration will change more than that of the complete specimen,while the transverse strain will change opposite;(2)The complete specimens and the specimens with natural transverse weak surfaces are brittle fractured failure under compression,the specimens with longitudinal weak surfaces are tensile failured along weak surfaces under compression,and the specimens with oblique triangular weak surfaces are shear failured along weak surfaces;(3)Acoustic emission signals of diabase specimens with longitudinal weak face are similar to those of complete specimens when compressed.Acoustic emission signals of diabase specimens with oblique triangle weak face are very active,and the impact rate of specimens has several peak stages.Acoustic emission signals are more active in the case of weak cross-section with double cross-section under compression than in the case of weak cross-section with single cross-section;(4)This test can provide guidance for excavation and support of rock mass with structural planes in stope.The research results can reflect the loading deformation and strength characteristics and failure modes of rock mass with different weak faces.
作者
王强
周扬一
李元辉
张凤鹏
WANG Qiang;ZHOU Yangyi;LI Yuanhui;ZHANG Fengpeng(Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Northeastern University,Shenyang,Liaoning 110819,China;College of Resources and Civil Engineering,Northeastern University,Shenyang,Liaoning 110819,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2019年第S02期3646-3653,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51674061)
中央高校基本科研业务费专项(N150104007)。
关键词
岩石力学
天然弱面
辉绿岩
声发射
撞击率
累计能量
rock mechanics
natural weak surface
diabase
acoustic emission
impact rate
cumulative energy
