深埋绿泥石片岩变形特征及稳定性分析
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摘要
根据锦屏二级水电站绿泥石片岩的特点,在同一断面综合采用变形、应力和钻孔电视多种监测手段,分析围岩内部的力学状态。为了更加深入地认识绿泥石片岩的工程力学特性及其对变形破坏机制的影响,开展单轴和三轴压缩试验、灌浆渗透性试验和三轴流变试验,揭示绿泥石片岩变形、破坏和失稳的多方面原因,并为支护措施的确定提供参考意见。绿片岩洞段的围岩稳定主要取决于衬砌结构能否抵挡流变和遇水软化2种作用导致的挤压效应,通过引入软化系数和退化的Burgers流变模型,从衬砌结构的受力角度对围岩稳定性进行评价,数值计算结果表明衬砌结构具有相当高的安全裕度。
According to the characteristics of chlorite schist in Jinping II hydropower station,in the same section,multiple monitoring means including the deformation,stress and borehole TV were adopted to analyze the internal mechanical state of surrounding rock.In order to understand the engineering mechanical properties of chlorite schist and its impact on the deformation failure mechanism,uniaxial and triaxial compression tests,grouting penetration test and triaxial rheological test were carried out.And the test results revealed many factors of deformation,instability and destruction of chlorite schist,and provided reference for determination of supporting measures.The stability of chlorite schist depends mainly on whether the lining structure can resist the squeezing effects caused by rheology and water softening.By introducing softening coefficient and Burgers rheological model,the surrounding rock stability from the viewpoint of the force of the lining structure was evaluated.The results of numerical calculation show that the lining structure is in high safety redundancy.
According to the characteristics of chlorite schist in Jinping II hydropower station,in the same section,multiple monitoring means including the deformation,stress and borehole TV were adopted to analyze the internal mechanical state of surrounding rock.In order to understand the engineering mechanical properties of chlorite schist and its impact on the deformation failure mechanism,uniaxial and triaxial compression tests,grouting penetration test and triaxial rheological test were carried out.And the test results revealed many factors of deformation,instability and destruction of chlorite schist,and provided reference for determination of supporting measures.The stability of chlorite schist depends mainly on whether the lining structure can resist the squeezing effects caused by rheology and water softening.By introducing softening coefficient and Burgers rheological model,the surrounding rock stability from the viewpoint of the force of the lining structure was evaluated.The results of numerical calculation show that the lining structure is in high safety redundancy.
引文
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[10]张传庆.雅砻江锦屏二级水电站深埋长大引水隧洞施工期围岩稳定性与动态反馈分析研究[R].武汉:中国科学院武汉岩土力学研究所,2010.(ZHANG Chuanqing.Deep buried long and large diversiontunnel surrounding rock stability and dynamic feedback analysis ofYalong River Jinping II hydropower station[R].Wuhan:Institute ofRock and Soil Mechanics,Chinese Academy of Sciences,2010.(inChinese))
[11]ZHANG C S,CHU W J,LIU N,et al.Laboratory tests and numericalsimulations of brittle marble and squeezing schist at Jinping IIhydropower station,China[J].Journal of Rock Mechanics and GeotechnicalEngineering,2011,3(10):30–38.
[12]朱永生,朱焕春.绿片岩段衬砌安全性评价[R].武汉:Itasca(武汉)咨询有限公司,2010.(ZHU Yongsheng,ZHU Huanchun.Safetyevaluation on lining of chlorite schist[R].Wuhan:Itasca ConsultingCo.,Ltd.,2010.(in Chinese))
[2]何满潮,景海河,孙晓明.软岩工程力学[M].北京:科学出版社,2002:153–175.(HE Manchao,JING Haihe,SUN Xiaoming.Mechanics for soft rocks[M].Beijing:Science Press,2002:153–175.(in Chinese))
[3]孙钧.岩土材料流变及工程应用[M].北京:中国建筑工业出版社,1999:459–562.(SUN Jun.Rheology of geomaterials and itsengineering application[M].Beijing:China Architecture and BuildingPress,1999:459–562.(in Chinese))
[4]何满潮.软岩巷道工程概论[M].徐州:中国矿业大学出版,1993:36–77.(HE Manchao.General theory of soft rock tunnel engineering[M].Xuzhou:China University of Mining and Technology Press,1993:36–77.(in Chinese))
[5]郭富利,张顶立,苏洁,等.地下水和围压对软岩力学性质影响的试验研究[J].岩石力学与工程学报,2007,26(11):2 324–2 332.(GUO Fuli,ZHANG Dingli,SU Jie,et al.Experimental study oninfluences of groundwater and confining pressure on mechanicalbehaviors of soft rocks[J].Chinese Journal of Rock Mechanics andEngineering,2007,26(11):2 324–2 332.(in Chinese))
[6]陈宗基.地下巷道长期稳定性的力学问题[J].岩石力学与工程学报,1982,1(1):1–20.(TANTjongkie.Mechanicalproblemsof long-termstability of underground galleries[J].Chinese Journal of Rock Mechanicsand Engineering,1982,1(1):1–20.(in Chinese))
[7]陈宗基,康文法.在岩石破坏和地震之前与时间有关的扩容[J].岩石力学与工程学报,1983,2(1):11–21.(TAN Tjongkie,KANGWenfa.Time dependent dilatancy prior to rock failure and earthquakes[J].Chinese Journal of Rock Mechanics and Engineering,1983,2(1):11–21.(in Chinese))
[8]刘志春,李文江,朱永全,等.软岩大变形隧道二次衬砌施作时机探讨[J].岩石力学与工程学报,2008,27(3):580–588.(LIUZhichun,LI Wenjiang,ZHU Yongquan,et al.Research on construction time ofsecondary lining in soft rock of large-deformation tunnel[J].ChineseJournal of Rock Mechanics and Engineering,2008,27(3):580–588.(in Chinese))
[9]晏启祥,何川,姚勇.软岩隧道施工特性及其动态力学行为研究[J].岩石力学与工程学报,2006,25(3):572–577.(YAN Qixiang,HE Chuan,YAO Yong.Study on construction characteristic anddynamic behavior of soft rock tunnel[J].Chinese Journal of RockMechanics and Engineering,2006,25(3):572–577.(in Chinese))
[10]张传庆.雅砻江锦屏二级水电站深埋长大引水隧洞施工期围岩稳定性与动态反馈分析研究[R].武汉:中国科学院武汉岩土力学研究所,2010.(ZHANG Chuanqing.Deep buried long and large diversiontunnel surrounding rock stability and dynamic feedback analysis ofYalong River Jinping II hydropower station[R].Wuhan:Institute ofRock and Soil Mechanics,Chinese Academy of Sciences,2010.(inChinese))
[11]ZHANG C S,CHU W J,LIU N,et al.Laboratory tests and numericalsimulations of brittle marble and squeezing schist at Jinping IIhydropower station,China[J].Journal of Rock Mechanics and GeotechnicalEngineering,2011,3(10):30–38.
[12]朱永生,朱焕春.绿片岩段衬砌安全性评价[R].武汉:Itasca(武汉)咨询有限公司,2010.(ZHU Yongsheng,ZHU Huanchun.Safetyevaluation on lining of chlorite schist[R].Wuhan:Itasca ConsultingCo.,Ltd.,2010.(in Chinese))
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