岩爆的相似材料物理模拟研究

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Abstract According to the test results of physico-mechanical properties of similar materials with various mixture ratios，a type of similar material with the most obvious tendency of rockburst is selected to produce a large-size model and to perform the physical simulation test of rockburst. The physical simulation test is carried out by means of opening hole simulating tunnel after model loading，combined with a typical section of diversion tunnel in a hydropower station. The study results show that，under the condition of natural stress state in the model boundaries，the arch crown，spandrel and side walls of tunnel respectively produce the obvious catastrophic phenomena of stress and strain；and the acoustic emission counts of surrounding rock also increase rapidly after tunnel excavation，showing the clear features of rockburst. The spalling，buckling and cracking phenomena of surrounding rock appear in model under over loading conditions. It is concluded that the tunnel in the hydropower station will mainly occur the tensile rockburst with the patterns of spalling，buckling and cracking.

Key words： rock mechanics rockburst physical simulation similar materials strain catastrophe spalling buckling and cracking

Received: 31 March 2010

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/IS1/2610

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