(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China)
Abstract:Rockburst is a dynamic geological disaster often encountered during the excavation of deep hard rock tunnels,and structural plane is found playing an important role in controlling the rockburst in deeply buried tunnels of Jinping II Hydropower Station. On the basis of summarizing the present research status and enumerating the typical cases of structure-type rockburst,controlling roles of different structural plane types,occurrence,and different production environment,construction methods and other conditions on rockburst are analyzed and a structure-type rockburst classification method is proposed based on different mechanisms. Analyses show that structure-type rockburst can be classified into slip burst,shear rupture burst and extensile spalling burst;extensile spalling burst can be easily induced by vertical occurrence structural plane in sidewall which makes surrounding rock suppress to tensile crack,while slip burst or shear rupture burst can be induced by structural plane of inclined occurrence;the intensity of shear rupture burst evoked by unexposed inclined structural plane may be higher than that of slip burst induced by exposed plane under the same condition;large scale slip burst mainly occurs in mining engineering,while small scale slip burst is more prone to take place in hydropower and traffic tunnels,and structural planes control the depth and boundary of the crater as well as dimension of ejecting blocks;for structure-type rockburst dominated by shear failure,energy released from the burst is partly determined by mechanical properties and strength characteristics of the structure plane,which affects the intensity of the burst. The research result will contribute to mechanism understanding and controlling method for structure-type rockburst in deep hard rock tunnels.
周 辉,孟凡震,张传庆,卢景景,徐荣超. 深埋硬岩隧洞岩爆的结构面作用机制分析[J]. 岩石力学与工程学报, 2015, 34(04): 720-727.
ZHOU Hui,MENG Fanzhen,ZHANG chuanqing,LU jingjing,XU rongchao. ANALYSIS OF THE STRUCTURAL PLANE CONTROLLING MECHANISM ON ROCKBURST IN DEEP HARD ROCK TUNNELS. , 2015, 34(04): 720-727.
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