地震边坡岩土体破坏特征探讨
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摘要
通过理论分析与FLAC数值模拟技术,分别探讨了地震边坡岩土体应力状态及其破坏特征。研究发现:地震荷载作用下,边坡坡顶单元易产生拉应力,发生拉破坏,其最小主应力方向与水平方向几乎一致,致使坡顶常表现为陡峻拉裂面;底部单元主应力方向发生改变,处于双向受压状态,发生剪切破坏;边坡动力失稳是因拉剪滑面贯通所致。
The stress state and failure characteristics of slope soil-rock mass under earthquake were discussed by the methods of theoretical analysis and FLAC numerical simulation techniques.It is found that the top soil-rock mass elements of slope are easy to produce tensile stress,and occur tensile failure under earthquake load,the direction of minimum principal stress is consistent with horizontal direction,which results in formation of steep fracture surface.The principal stress direction of the bottom soil-rock mass elements change,they are under the state of bi-directional compression,occur shear failure.Slope dynamic instability is due to the formation of tension-shear fracture surface.
The stress state and failure characteristics of slope soil-rock mass under earthquake were discussed by the methods of theoretical analysis and FLAC numerical simulation techniques.It is found that the top soil-rock mass elements of slope are easy to produce tensile stress,and occur tensile failure under earthquake load,the direction of minimum principal stress is consistent with horizontal direction,which results in formation of steep fracture surface.The principal stress direction of the bottom soil-rock mass elements change,they are under the state of bi-directional compression,occur shear failure.Slope dynamic instability is due to the formation of tension-shear fracture surface.
引文
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[2]Li X P,He Siming.Seismically induced slope instabilities and the cor-responding treatments:the case of a road in the Wenchuan earthquakehit region[J].Journal of Mountain Science,2009,6(1):96-100.
[3]许强,黄润秋.“5.12”汶川大地震诱发大型崩滑灾害动力特征初探[J].工程地质学报,2008,16(6):721-729.Xu Qiang,Huang Runqiu.Kinetics characteristics of large landslidestriggered by May 12th Wenchuan earthquake[J].Journal of Engi-neering Geology,2008,16(6):721-729.
[4]李秀珍,孔纪名,邓红艳,等.“5.12”汶川地震滑坡特征及失稳破坏模式分析[J].四川大学学报(工程科学版),2009,41(3):72-77.Li Xiuzhen,Kong Jiming,Deng Hongyan,et al.Analysis on charac-teristics and deformation failure mode of large-scale landslides in-duced by“5.12”Wenchuan earthquake[J].Journal of SichuanUniversity(Engineering Science Edition),2009,41(3):72-77.
[5]黄润秋,李为乐.“5.12”汶川大地震触发地质灾害的发育分布规律研究[J].岩石力学与工程学报,2009,27(12):2 585-2 592.Huang Runqiu,Li Weile.Research on development and distributionon rules of geohazards induced by Wenchuan earthquake on 12thMay[J].Chinese Journal of Rock Mechanics and Engineering,2009,27(12):2 585-2 592.
[6]郑颖人,叶海林,黄润秋.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,28(8):1 714-1 723.Zheng Yingren,Ye Hailin,Huang Runqiu.Analysis and discussionof failure mechanism and fracture surface of slope under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(8):1 714-1 723.
[7]言志信,蔡汉成,王群敏,等.岩土体在地震作用下的破坏研究[J].煤炭学报,2010,35(10):1 621-1 626.Yan Zhixin,Cai Hancheng,Wang Qunmin,et al.Research on failureof rock and soil mass under earthquake[J].Journal of China CoalSociety,2010,35(10):1 621-1 626.
[8]王来贵,赵娜,李天斌.强震诱发单一弱面斜坡塌滑有限元模拟[J].岩石力学与工程学报,2009,28(S1):3 163-3 167.Wang Laigui,Zhao Na,Li Tianbin.Finite element simulation of col-lapse and sliding of slope with single weak plane induced by strongearthquake[J].Chinese Journal of Rock Mechanics and Engineer-ing,2009,28(S1):3 163-3 167.
[9]朱万成,左宇军,尚世明.动态扰动触发深部巷道发生失稳破裂的数值模拟[J].岩石力学与工程学报,2007,26(5):915-921.Zhu Wancheng,Zuo Yujun,Shang Shiming.Numerical simulation ofin stable failure of deep rock tunnel triggered by dynamic disturb-ance[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(5):915-921.
[10]曹安业,范军,牟宗龙,等.矿震动载对围岩的冲击破坏效应[J].煤炭学报,2010,35(12):2 006-2 010.Cao Anye,Fan Jun,Mou Zonglong,et al.Burst failure effect of min-ing-induced tremor on roadway surrounding rock[J].Journal ofChina Coal Society,2010,35(12):2 006-2 010.
[11]朱万成,唐春安,黄志平,等.静态和动态载荷作用下岩石劈裂破坏模式的数值模拟[J].岩石力学与工程学报,2006,24(1):1-7.Zhu Wancheng,Tang Chun’an,Huang Zhiping,et al.Numericalsimulation on splitting failure mode of rock under static and dynam-ic loadings[J].Chinese Journal of Rock Mechanics and Engineer-ing,2006,24(1):1-7.
[12]Itasca Consulting Group Inc.FLAC-2D(Version 6.0)users manual[R].USA:Itasca Consulting Group Inc.,2008.
[13]徐光兴,姚令侃,李朝红,等.边坡地震动力响应规律及地震动参数影响研究[J].岩土工程学报,2008,30(6):918-923.Xu Guangxing,Yao Lingkan,Li Zhaohong,et al.Dynamic responseof slopes under earthquakes and influence of ground motion param-eters[J].Chinese Journal of Geotechnical Engineering,2008,30(6):918-923.
[14]陈育民,徐鼎平.FLAC/FLAC-3D基础与工程实例[M].北京:中国水利水电出版社,2009.
[15]Yan Zhixin,Duan Jian,Wang Houyu.Constitutive models in stabili-ty analysis of rock slope[J].Journal of Central South University ofTechnology,2008,15(2):302-306.
[16]言志信,段建,王后裕.无明显滑面岩质边坡稳定性研究[J].煤炭学报,2010,35(8):1 283-1 286.Yan Zhixin,Duan Jian,Wang Houyu.Study on the stability of rockslope without obvious sliding surface[J].Journal of China Coal So-ciety,2010,35(8):1 283-1 286.
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