A physical simulation test for the rockburst in tunnels |
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| Authors: | Tianbin Li Xiangfeng Wang Lubo Meng |
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| Institution: | (1) State Key Laboratory of Geomechanics and Geotechnique Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 43007, China;(2) Department of Civil and Architecture Engineering, Guangxi University, Nanning, 530004, China |
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| 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. |
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