锦屏二级水电站深埋隧洞开挖损伤区特征分析

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摘要在高应力条件下，岩体强度和应力之间的尖锐矛盾将导致围岩出现损伤，损伤是不同应力条件下围岩状态的直接体现。利用声波检测和钻孔电视对锦屏二级深埋引水隧洞的一典型断面进行全断面测试，声波测试结果显示，断面上低波速带断面形态呈不对称状，与断面应力分布也并不完全对应。在每个声波钻孔中补充钻孔电视，对破裂发育深度和围岩内部实际构造特征有了更直观的认识。为对损伤区特性进行更加准确的描述，利用FLAC3D计算在洞周不同位置处关键点的应力路径，对关键点的应力状态进行分析。在UDEC泰森多边形离散的基础上增加对于节理的描述，分析节理对损伤区分布的影响，模拟结果表明，节理的存在改变了隧洞开挖后洞周的应力分布，从而导致围岩破损和破坏区域的差异。最后，借助于颗粒流程序PFC对隧洞开挖后围岩的损伤区进行模拟，所揭示出的损伤局部化特征和损伤区、破裂区分布特征与现场实际具有很好的一致性。

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关键词 ：岩石力学, 开挖损伤区, 应力状态, 节理, 损伤程度, 大理岩

Abstract：In high stress condition，the sharp conflict between rock mass strength and stress will lead to damage to surrounding rock. Damage is the direct embodiment of the state of surrounding rock. The acoustic detection and borehole television are used to test a whole section in Jinping II deep diversion tunnel. The acoustic test results show that the section shape of low wave velocity zone is not symmetrical；and stress distribution is not completely corresponding. The borehole television was added in each acoustic drilling，a more intuitive understanding on fracture development depth and internal actual structure features of surrounding rock is obtained. In order to describe the damage zone characteristics more accurately，FLAC3D is used to calculate the stress path of the key points in different positions and analyze the stress states of the key points. Based on the discretization by UDEC voronoi polygons，adding the joint description，the influence of joint on excavation damaged zone(EDZ) is analyzed. The simulation results show that the presence of joint changes the stress distribution after excavation and leads to the difference in damage and fracture zones. With the help of particle flow code(PFC) in advantage of describing microscopic fracture characteristics，the damage zone is simulated. It is revealed the damage localization characteristics and damage zone，fracture zone distribution characteristics have the very good consistency with actual ones.

Key words： rock mechanics excavation damaged zone(EDZ) stress state joint damage degree marble

收稿日期: 2013-05-20

引用本文:

刘宁，张春生，褚卫江，吴旭敏. 锦屏二级水电站深埋隧洞开挖损伤区特征分析[J]. 岩石力学与工程学报, 2013, 32(11): 2235-2241.
LIU Ning，ZHANG Chunsheng，CHU Weijiang，WU Xumin. EXCAVATION DAMAGED ZONE CHARACTERISTICS IN DEEP TUNNEL OF JINPING II HYDROPOWER STATION. , 2013, 32(11): 2235-2241.

链接本文:

http://www.rockmech.org/CN/Y2013/V32/I11/2235

[10]	HOEK E. Rock engineering[M]. [S.l.]：A.A.Balkema Publishers，2005：25-48. " target="_blank">
[1]	READ R S. Interpreting excavation-induced displacements around a tunnel in highly stressed granite[Ph. D. Thesis][D]. Winnipeg：University of Manitoba，1994. " target="_blank">
[5]	TSANG C F，BERNIER F，DAVIES C. Geohydromechanical processes in the excavation damaged zone in crystalline rock，rock salt，and indurated and plastic clays-in the context of radioactive waste disposal[J]. International Journal of Rock Mechanics and Mining Sciences，2005，42(1)：109-125. " target="_blank">
[9]	张春生，陈祥荣，侯靖，等. 锦屏二级水电站深埋大理岩力学特性研究[J]. 岩石力学与工程学报，2010，29(10)：1 999-2 009. (ZHANG Chunsheng，CHEN Xiangrong，HOU Jing，et al. Study of mechanical behavior of deep-buried marble at Jinping II hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(10)：1 999-2 009.(in Chinese))
[2]	READ R S. 20 years of excavation response studies at AECL?s Underground Research Laboratory[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(8)：1 251-1 275. " target="_blank">
[8]	胡大伟，周辉，谢守益，等. 峰后大理岩非线性渗流特征及机制研究[J]. 岩石力学与工程学报，2009，28(3)：451-458.(HU Dawei，ZHOU Hui，XIE Shouyi，et al. Research on character and mechanism of nonlinear seepage in post-peak marble[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(3)：451-458.(in Chinese))
[12]	刘宁，张春生，褚卫江. 锦屏深埋大理岩破裂特征与损伤演化规律[J]. 岩石力学与工程学报，2012，31(8)：1 606-1 613.(LIU Ning，ZHANG Chunsheng，CHU Weijiang. Fracture characteristics and damage evolution law of Jinping deep marble[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(8)：1 606-1 613.(in Chinese))
[3]	MARTIN C D，READ R S，MARTINO J B. Observations of brittle failure around a circular test tunnel[J]. International Journal of Rock Mechanics and Mining Sciences，1997，34(7)：1 065-1 073. " target="_blank">
[4]	BACKBLOM G，MARTIN C D. Recent experiments in hard rocks to study the excavation response：implications for the performance of a nuclear waste geological repository[J]. Tunnelling and Underground Space Technology，1999，14(3)：377-394. " target="_blank">
[6]	葛修润. 岩石疲劳破坏的变形控制律、岩土力学试验的实时X射线CT扫描和边坡坝基抗滑稳定分析的新方法[J]. 岩土工程学报，2008，30(1)：1-20.(GE Xiurun. Deformation control law of rock fatigue failure，real-time X-ray CT scan of geotechnical testing，and new method of stability analysis of slopes and dam foundations[J]. Chinese Journal of Geotechnical Engineering，2008，30(1)：1-20.(in Chinese))
[7]	肖建清，冯夏庭，林大能. 爆破循环对围岩松动圈的影响[J]. 岩石力学与工程学报，2010，29(11)：2 248-2 255.(XIAO Jianqing，FENG Xiating，LIN Daneng. Influence of blasting round on excavation damaged zone of surrounding rock[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(11)：2 248-2 255.(in Chinese))
[14]	FAIRHURST C. Nuclear waste disposal and rock mechanics：contributions of the Underground Research Laboratory(URL)，Pinawa，Manitoba[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(8)：1 221-1 227. " target="_blank">
[11]	MARTIN C D，CHANDLER N A. The progressive fracture of Lac du Bonnet granite[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1994，31(6)：643-659. " target="_blank">
[13]	褚卫江. 深埋条件下隧洞围岩稳定与结构安全评估[R]. 杭州：中国水电顾问集团华东勘测设计研究院，2009.(CHU Weijiang. Evaluation of surrounding rock stability and structure safety of deep tunnel[R]. Hangzhou：HydroChina Huadong Engineering Corporation，2009.(in Chinese)) " target="_blank">
[15]	SITHARAM T G，LATHA G M. Simulation of excavations in jointed rock masses using a practical equivalent continuum approach[J]. International Journal of Rock Mechanics and Mining Sciences，2002，39(4)：517-525.