深埋隧洞应变型岩爆倾向性评估的新数值指标研究

发布时间：2018-10-14 18:53

【摘要】：应变型岩爆是深埋隧洞常见且频发的岩爆类型,严重威胁深埋隧洞施工安全,其破坏位置和程度的准确评估对该类岩爆的防治具有极为重要的工程意义。在系统总结和分析国内外岩爆倾向性数值指标评估方法优势和不足的基础上,从局部能量释放率基本理论出发,提出新的岩爆倾向性评估数值指标,即相对能量释放指数(RERI)。全面地阐述该指标的构建思想和基本原理及其物理意义,并将该指标成功应用于锦屏二级水电站引水隧洞应变型岩爆和加拿大Rm415试验洞脆性破坏等问题分析,验证新指标的合理性和适用性。研究表明,RERI指标能够较为准确地指出高应变型岩爆风险区域和位置,并能相对准确地指出深埋隧洞岩体开挖损伤区的范围,为深埋隧洞应变型岩爆灾害和脆性破坏的评估与防治提供新理论和分析工具。
[Abstract]:Strain type rockburst is a common and frequent type of rockburst in deep buried tunnel, which seriously threatens the safety of deep buried tunnel construction. The accurate assessment of its damage location and degree is of great engineering significance for the prevention and treatment of this kind of rockburst. On the basis of systematically summarizing and analyzing the advantages and disadvantages of domestic and foreign methods for evaluating rockburst propensity, based on the basic theory of local energy release rate, a new numerical index of rockburst tendency assessment, namely relative energy release index (RERI).), is put forward. The construction idea, basic principle and physical significance of this index are expounded in detail. The index is successfully applied to the analysis of strain type rockburst in diversion tunnel of Jinping II Hydropower Station and brittle failure of Canadian Rm415 test tunnel. Verify the rationality and applicability of the new index. The results show that the RERI index can accurately indicate the risk area and location of high strain rock burst, and relatively accurately point out the damage area of deep tunnel rock mass excavation. It provides a new theory and analysis tool for the assessment and prevention of strain type rock burst and brittle failure of deep buried tunnel.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家重点基础研究发展计划(973)项目(2010CB732006) 国家自然科学基金资助项目(51309218,51279201)
【分类号】：U451.2

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