Mechanical properties and rockburst proneness of phyllite under uniaxial compression  

单轴压缩下千枚岩的力学特性和岩爆倾向性

作　　者：Xue-feng SI Lin-qi HUANG Xi-bing LI Feng-qiang GONG Xi-ling LIU 司雪峰;黄麟淇;李夕兵;宫凤强;刘希灵(中南大学资源与安全工程学院,长沙410083;东南大学土木工程学院,南京211189)

机构地区：[1]School of Resources and Safety Engineering,Central South University,Changsha 410083,China [2]School of Civil Engineering,Southeast University,Nanjing 211189,China

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第12期3862-3878,共17页中国有色金属学报（英文版）

基　　金：The authors are grateful for the financial supports from the National Natural Science Foundation of China(Nos.51904335,11972378,41630642);the Fundamental Research Funds for the Central Universities of Central South University,China(No.2019zzts310).

摘　　要：To investigate the influence of the bedding angle,β,on the mechanical properties and rockburst proneness,uniaxial compression tests were conducted using cylindrical phyllite specimens with different bedding angles.According to the results,the peak stress,peak strain,cumulative acoustic emission counts,and potential energy of the elastic strain exhibited a U-shaped change trend.With an increase in β from 0°to 90°,the failure mode transformed from tensile splitting failure along the bedding plane to shear slip failure along the weak bedding plane.Finally,the failure mode evolved into a tensile splitting failure across the bedding plane.When β=15°,30°,and 45°,the phyllite specimens exhibited strong,slight,and moderate rockburst proneness,with strong,slight,and moderate shear slip rockbursts,respectively.When β=0°,60°,75°,and 90°,the phyllite specimens had extremely strong rockburst proneness,and an extremely strong strain rockburst occurred.为了研究层理角度β对力学特性和岩爆倾向性的影响,对不同层理角度下的圆柱体千枚岩试样进行单轴压缩试验。结果表明,峰值应力、峰值应变、累计声发射计数和弹性应变势能均呈U形变化趋势。随着β从0°增大到90°,破坏模式从沿着层理面的拉伸劈裂破坏转变为沿着弱层理面的剪切滑移破坏;最终,破坏模式演变为穿越层理面的拉伸劈裂破坏。当β=15°、30°和45°时,千枚岩试样分别表现出强烈、轻微和中等岩爆倾向性,并且分别发生强烈、轻微和中等的剪切滑移型岩爆。当β=0°、60°、75°和90°时,千枚岩试样具有极强的岩爆倾向性,并且发生极强的应变型岩爆。

关 键 词：PHYLLITE bedding angle mechanical properties failure mode transformation rockburst proneness 

分 类 号：TD313[矿业工程—矿井建设]