关于龙游石窟4号洞4-2号岩柱长期抗剪强度反分析问题的讨论
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摘要
对于地下工程来说,围岩的长期抗剪强度从来是工程设计者和研究者所关心的课题。但历来仅根据持续时间十分 有限的试验来确定。因此从某种意义上说,由这类试验所得到的,并非真正意义上的长期抗剪强度。所以,本文提出的根据 龙游大型古地下工程即龙游石窟岩柱(包括柱础)的剪坏现象反算岩柱的长期抗剪强度的成果,是很有理论价值的。本文将 以龙游石窟4号洞的4-2号岩柱为对象作古地下工程岩柱长期抗剪强度的反演研究。为了在反演中能进一步考虑剪切面上 各部位的应力变化,作者还借助于FLAC-3D分析结果对不同部分分别进行研究,从而取得了较好的反演结果。
For an underground structure, long-term shear strength of the surrounding rock always concerns engineering designers and researchers. In fact, the shear strength tested within a limited time period does not truly reflect its long-term strength. Therefore, it is very important to conversely calculate the long-term shear strength of rock pillar (including the base of pillar) of large ancient underground caverns, based on its shearing failure. In this paper the back analysis of long-term shear strength of no.4-2 rock pillar in the no.4 cavern at Longyou Caverns is presented. In order to further consider distribution of stresses in different parts of the shearing surface, the authors used FLAC-3D in simulation. The results shows.
For an underground structure, long-term shear strength of the surrounding rock always concerns engineering designers and researchers. In fact, the shear strength tested within a limited time period does not truly reflect its long-term strength. Therefore, it is very important to conversely calculate the long-term shear strength of rock pillar (including the base of pillar) of large ancient underground caverns, based on its shearing failure. In this paper the back analysis of long-term shear strength of no.4-2 rock pillar in the no.4 cavern at Longyou Caverns is presented. In order to further consider distribution of stresses in different parts of the shearing surface, the authors used FLAC-3D in simulation. The results shows.
引文
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[10] 李攀峰,张倬元.陶连金某大型地下洞室群围岩稳定性分类研究[J].工程地质学报,2004,12(1):25～29.LiPanfeng,ZhangZhuoyuan,TaoLianjin.Stabilityrankingsys temofrockmasssurroundingalarge-scaleundergroundcavern group.JournalofEngineeringGeology,2004,12(1):25～29.
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[2] 杨志法.用追踪法确定连续破坏状态三轴试验的控制参数[J].地质科学,1985,(3):266～273.Yangzhifa.Makingsurecontinuousfailurestatetriaxialtestcontrol paramenterbytracing.GeologyScience,1985,(3):266～273.
[3] Yangzhifaetal..Back-analysisofViscoelasticdisplacementsina softrockroadtunnel[J].InternationalJournalofRockMechanics&MiningSciences,2001,38,331～341.
[4] 杨志法.块体坐标投影作图法与块体几何条件的确定[A].岩体工程地质力学问题(三)[C].北京:地震出版社,1980.Yangzhifa.Blockcoordinateprojectandtheassuranceofblockgeo metricalcondition.Problemofengineeringgeomechanicsofrock mass.(vol3),1980.
[5] 王思敬等.地下工程岩体稳定分析[M].北京:科学出版社,1984.Wangsijingetal..Thestabilizationanalyseofrockmassinunder groundproject.Beijing:SciencePress,1984.
[6] 杨志法,王思敬等.岩土工程反分析的原理及方法[M].北京:地震出版社,2002.Yangzhifa,Wangsijingetal..TheGeotechnicalEngineeringBack- analysisTheoryandMethod.Beijing:SeismicPress,2002.
[7] 王芝银,李云鹏.地下工程位移反分析及程序[M].陕西:陕西科学技术出版社,1993.Wangzhiyin,Liyunpeng.UndergroundExcavationDisplacementBack-analysisandProgram.Shanxi:ShanxiScienceandTechnol ogyPress,1993.
[8] 杨林德等.岩土工程问题的反演理论与工程实践[M].北京:科学出版社,1996.Yanglindeetal..TheGeotechnicalEngineeringBack-analysisTheoryandEngineeringPractice.Beijing:SciencePress,1996.
[9] 孙钧等.岩土力学反演问题的随机理论与方法[M].深圳:汕头大学出版社,1996.Sunjunetal..TheGeomechanicsBack-analysisProblemAcciden talTheoryandMethod.Shenzhen:ShantouUniversityPress,1996.
[10] 李攀峰,张倬元.陶连金某大型地下洞室群围岩稳定性分类研究[J].工程地质学报,2004,12(1):25～29.LiPanfeng,ZhangZhuoyuan,TaoLianjin.Stabilityrankingsys temofrockmasssurroundingalarge-scaleundergroundcavern group.JournalofEngineeringGeology,2004,12(1):25～29.
[10] 唐辉明.用反算法确定岩体抗剪强度参数[C].第四届全国工程地质大会论文集(三)[A].北京:海洋出版社,1992,1486～1489.Tanghuiming.AscertainingRockMassShearingStrengthParame terbyBack-calculating.TheForthcountrywideEngineeringGe ologyConventionPaperCollection(Vol3).Beijing:OceanPress,1992,1486～1489.
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