Vol8 No.2: 278-285

【Title】A Physical Simulation Test for the RockBurst in Tunnels

【Author】 LI Tianbin¹*, WANG Xiangfeng^1,2, MENG Lubo¹

【Addresses】1 State Key Laboratory of Geohazard Prevention & Geoenvironment Protection, Chengdu University of Technology ,Chengdu 610059, China; 2 Sichuan Communication Surveying &Design Institute, Chengdu 610017,China

【Corresponding author】ltb@cdut.edu.cn

【Citation】 LI Tianbin, WANG Xiangfeng, MENG Lubo. A Physical Simulation Test for the RockBurst in Tunnels. Journal Of Mountain Science (2011) 8(2): 278–285. DOI: 10.1007/s11629-011-2116-5

【DOI】10.1007/s11629-011-2116-5

【Abstract】According to the test results of the physical and mechanical properties of similar materials in various quality mixture, a type of material with obvious tendency of rockburst was selected to produce a large-size model to simulate rockburst phenomena in tunnels. The prototype model comes from a typical section of diversion tunnels in Jinping Hydropower Station in China. The simulation of excavating tunnels is carried out by opening a hole in the model after loading. The modeling results indicated that under the condition of normal stresses in the model boundaries the arch top, spandrel and side walls of the tunnel produced an obvious jump reaction of stress and strain and the acoustic emission counts of the surrounding rock also increased rapidly in a different time period after the “tunnel” excavation, showing the clear features of rockburst. The spalling, buckling and breaking occurred in the surrounding rock of model in conditions of over loading. It is concluded that the modeling tunnel segment in Jinping Hydropower Station is expected to form the tensile rockburst with the pattern of spalling, buckling and breaking.

【Keywords】Rockburst; Physical simulation; Similar materials (Gypsum, Cement, Sand, Water); Strain jump; Spalling; Buckling; Breaking