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Experimental simulation investigation of influence of depth on spalling characteristics in circular hard rock tunnel

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Journal of Central South University 2020年第3期27卷 891-910页

作者： LUO Yong GONG Feng-qiang LI Xi-bing WANG Shan-yong School of Resources Environment and Safety Engineering University of South ChinaHengyang 421001China School of Resources and Safety Engineering Central South UniversityChangsha 410083China School of Civil Engineering Southeast UniversityNanjing 211189China ARC Centre of Excellence for Geotechnical Science and Engineering Faculty of Engineering and Built EnvironmentThe University of NewcastleCallaghanNSW 2238Australia

A series of true-triaxial compression tests were performed on red sandstone cubic specimens with a circular hole to investigate the influence of depth on induced spalling in *** failure process of the hole sidewalls was monitored and recorded in real-time by a micro-video monitoring *** general failure evolution processes of the hole sidewall at different initial depths(500 m,1000 m and 1500 m)during the adjustment of vertical stress were *** results show that the hole sidewall all formed spalling before resulting in strain rockburst,and ultimately forming a V-shaped *** far-field principal stress for the initial failure of the tunnel shows a good positive linear correlation with the *** the depth increases,the stress required for the initial failure of the tunnels clearly increased,the spalling became more intense;the size and mass of the rock fragments and depth and width of the V-shaped notches increased,and the range of the failure zone extends along the hole sidewall from the local area to the entire ***,as the depth increases,the support area around the tunnel should be increased accordingly to prevent spalling.

关键词： deep underground engineering circular tunnels spalling strain rockburst true-triaxial loading V-shaped notch

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