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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。
Strain rockburst is a common and frequent rockburst type in deep tunnels. It is a serious threat to the construction safety of deep tunnels. Accurate assessment of the damage location and degree has an extremely important engineering significance for the prevention and control of such rockbursts. Based on the systematic summarization and analysis of the advantages and disadvantages of the numerical evaluation methods of rockburst at home and abroad, a new numerical index of rockburst propensity assessment is put forward based on the basic theory of local energy release rate, that is, the relative energy release index (RERI) . This paper comprehensively expounds the construction idea, basic principle and physical meaning of the index, and applies the index to rockburst of diversion tunnel and brittle failure of Rm415 test site in Jinping II Hydropower Station successfully, so as to verify the reasonableness of the new index Sexuality and applicability. The research shows that the RERI index can accurately point out the risk zone and location of high strain rock burst, and can relatively accurately point out the range of rock excavation damage area for deep tunnel, which is the keystone type rock burst and brittle failure Provide new theoretical and analytical tools for assessment and prevention.