| 中间主应力对隧洞岩爆影响的模型试验研究 |
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| 引用本文： | 梅诗明,胡小川,苏国韶,陈冠言.中间主应力对隧洞岩爆影响的模型试验研究[J].岩土力学,2019,40(10):3959-3968. |
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| 作者姓名： | 梅诗明 胡小川 苏国韶 陈冠言 |
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| 作者单位： | 1. 广西大学 土木建筑工程学院，广西 南宁 530004；2. 广西大学 工程防灾与结构安全教育部重点实验室，广西 南宁 530004 |
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| 基金项目： | 国家自然科学基金(No. 41472329)；广西自然科学基金创新研究团队项目(No. 2016GXNSFGA380008)。 |
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| 摘 要： | 为探究隧洞纵轴线方向应力对隧洞岩爆的影响，利用真三轴岩爆试验系统，对含预制圆孔的立方体花岗岩试样进行不同中间主应力条件下的岩爆模型试验，在室内再现了隧洞岩爆过程。试验中采用视频观测系统与声发射系统监测岩爆过程。试验研究结果表明：无宏观破坏、颗粒弹射、岩板劈裂和块片喷射是隧洞岩爆孕育过程主要经历的4个阶段；中间主应力越高，颗粒弹射到块片喷射之间的历时越短，岩板劈裂持续时间越长，块片喷射的持续时间越短且喷射破坏越剧烈；中间主应力越高，在环向第一主应力和纵轴向中间主应力的泊松效应迭加作用下，围岩劈裂破坏越严重，岩爆发生需要的应力水平越高，岩爆发生风险有所降低；但当应力集中水平足够高导致岩爆发生时，岩爆烈度越强。
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| 关 键 词： | 隧洞 岩爆 模型试验 中间主应力 |
| 收稿时间： | 2018-11-12 |
Model test study of the influence of intermediate principal stress on rockburst in tunnel |
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| MEI Shi-ming,HU Xiao-chuan,SU Guo-shao,CHEN Guan-yan.Model test study of the influence of intermediate principal stress on rockburst in tunnel[J].Rock and Soil Mechanics,2019,40(10):3959-3968. |
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| Authors: | MEI Shi-ming HU Xiao-chuan SU Guo-shao CHEN Guan-yan |
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| Institution: | 1. School of Civil and Architecture Engineering, Guangxi University, Nanning, Guangxi 530004, China;
2. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning, Guangxi 530004, China |
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| Abstract: | To explore the influence of tunnel axis stress on rockburst, rockburst model tests were performed to reproduce the rockburst process of the tunnel. Under different intermediate principal stress conditions, the tests were carried out on cubic granite specimens with prefabricated holes by using the true triaxial rockburst test system. The whole rockburst process was monitored by a real-time video observation system and an acoustic emission system under true triaxial loading conditions. The test results show that no macroscopic damage, particle ejection, rock fracturing and block ejection are the four main stages of the whole rockburst process. The higher the intermediate principal stress is, the shorter the time between the ejection of the particles and the block injection is, the longer the splitting duration is, the shorter the ejection duration but more severe is. With a higher intermediate principal stress, the splitting failure is more obvious under the Poisson effect resulting from the tangential first principal stress and the axial intermediate principal stress. Besides, a higher stress level is required for rockburst, and the risk of rockburst in the tunnel is reduced. However, once the stress concentration level is high enough to induce rockburst, the rockburst intensity is higher. |
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| Keywords: | tunnel rockburst model test intermediate principal stress |
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