引汉济渭秦岭深埋特长隧洞高地应力与岩爆关系研究

发布时间：2018-03-26 00:06

本文选题：隧洞　切入点：岩爆　出处：《西南交通大学》2014年硕士论文

【摘要】：本文以引汉济渭秦岭隧洞为工程背景,参考已有的研究成果,在查明研究区域的工程地质条件、现场地应力测试、室内岩石物理力学试验、三维初始地应力场反演和开挖后二次应力场模拟的基础上,对地应力与岩爆的规律做了较为系统的分析和研究。主要获得以下的研究成果： (1)通过现场地应力测试,查明了秦岭隧洞工程区的空间应力情况,对整个隧洞工程的地应力空间分布规律有了系统的认识。秦岭隧址区的应力场以NW向挤压为主。最大主应力方向为N30°W~N46°W。 (2)通过岩石室内试验(岩石物理力学试验、岩石常规三轴试验、岩石刚性三轴试验)研究,表明引汉济渭秦岭隧洞的硬质岩在岩性和强度上具备发生岩爆的条件。 (3)对已开挖的隧洞区进行三维初始地应力反演,结果表明,初始地应力场中,最大主应力、中间主应力和最小主应力均随埋深的增加而增大。反演分析表明,最大主应力大部分介于10-45MPa,中间主应力大部分介于10-25MPa,最小主应力大部分介于0～15MPa。 (4)在对引汉济渭秦岭隧洞已开挖段发生的岩爆进行研究和分析的基础上,借鉴前人的已有研究成果,总结出从应力条件(初始地应力、二次扰动应力)和岩性条件(岩体单轴抗压强度、岩体完整性系数、抗压强度与抗拉强度之比)为主的岩爆判断依据。
[Abstract]:In this paper, based on the engineering background of the Qinling tunnel, the engineering geological conditions, in-situ stress test, and indoor rock physical and mechanical tests in the study area have been found out with reference to the existing research results. Based on the inversion of 3D initial stress field and the simulation of secondary stress field after excavation, the regularity of in-situ stress and rockburst is systematically analyzed and studied. 1) the spatial stress in the Qinling tunnel project area has been found out by in-situ stress test. The spatial distribution of geostress in the whole tunnel project is systematically understood. The stress field in Qinling tunnel area is dominated by NW compression, and the maximum principal stress direction is N30 掳W~N46 掳W. 2) through the laboratory test of rock (rock physical mechanics test, rock routine triaxial test, rock rigid triaxial test), it is shown that the hard rock introduced from Hanji-Weiqinling tunnel has the condition of rock burst in lithology and strength. The results show that the maximum principal stress, the intermediate principal stress and the minimum principal stress increase with the increase of the buried depth in the initial geostress field, and the inversion analysis shows that the maximum principal stress, the intermediate principal stress and the minimum principal stress increase with the increase of the buried depth. The maximum principal stress is between 10-45 MPA, the intermediate principal stress is mostly 10-25 MPA, and the minimum principal stress is mostly 0.15 MPA. 4) based on the research and analysis of rock burst in the excavated section of Qinling tunnel in Ji-Wei, the author summarizes the stress condition (initial in-situ stress) by referring to the previous research results. Second disturbance stress) and lithologic conditions (uniaxial compressive strength of rock mass, integrity coefficient of rock mass, ratio of compressive strength to tensile strength) are the main criteria for judging rock burst.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU45;TV554

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