深埋隧洞岩爆风险尺寸效应问题探讨

发布时间：2018-11-17 13:24

【摘要】：岩爆是深埋工程建设面临的关键技术难题,岩爆风险的准确预测与评估至关重要。以全长超过16 km的锦屏二级7条不同洞径的深埋隧洞群岩爆实际发生情况作为统计依据,通过岩爆倾向性试验、应力状态、应力路径、蓄能深度、释放能量等多种方法和指标,对岩爆风险中存在的尺寸效应进行了深入探讨。研究结果表明,以小尺度岩石力学性质为基础的岩爆倾向性评价方法,由于难以反映地应力条件的变化,因此具有一定的局限性,而采用应力和能量分析方法则能够较准确地揭示岩爆风险中存在的尺寸效应。基于对深埋大理岩力学特性的深入认识,结合应力路径、蓄能能力、释放能量等因素的分析,7 m洞径的排水洞较6 m洞径的交通洞和13 m洞径的引水隧洞具有更高的岩爆风险,证明岩爆风险与隧洞尺寸并不存在完全的线性对应关系,存在一定的尺寸效应。根据现场实际统计数据,无论岩爆段所占比例,还是强烈~极强岩爆比例,排水洞也均高于交通洞和引水隧洞,而交通洞与引水隧洞的岩爆频次和强度基本相当,与理论分析结果基本吻合。
[Abstract]:Rock burst is a key technical problem in the construction of deep buried engineering. It is very important to accurately predict and evaluate the risk of rock burst. Based on the statistical basis of the actual occurrence of rockburst in 7 deep buried tunnels with different diameters in Jinping with a total length of more than 16 km, the rock burst tendency test, stress state, stress path, energy storage depth, energy release and other methods and indexes are used. The size effect in rock burst risk is discussed. The results show that the rock burst tendency evaluation method based on the mechanical properties of small scale rock has some limitations because it is difficult to reflect the variation of stress conditions. The stress and energy analysis method can accurately reveal the size effect in the risk of rockburst. Based on the deep understanding of the mechanical properties of deep buried marble, combined with the analysis of stress path, energy storage capacity, energy release and other factors, The drainage tunnel with 7 m diameter has higher rock burst risk than the traffic tunnel with 6 m diameter and the diversion tunnel with 13 m diameter. It is proved that there is not a complete linear relationship between rock burst risk and tunnel size, and there exists a certain size effect. According to the field statistical data, no matter the proportion of rock burst section or the ratio of strong to extremely strong rock burst, the drainage tunnel is also higher than traffic tunnel and diversion tunnel, and the frequency and intensity of rock burst in traffic tunnel and diversion tunnel are basically the same. The results are in good agreement with the theoretical analysis.
【作者单位】：中国电建集团华东勘测设计研究院有限公司;浙江中科依泰斯卡岩石工程研发有限公司;
【基金】：国家自然科学基金青年基金资助项目(51409265) 中国电建集团公司科技项目(GW KJ 2013 11)~~
【分类号】：U456.33

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