岩土体在地震作用下的破坏研究
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摘要
基于波动理论,从边坡岩土体的应力状态出发,分析了岩土体在地震作用下产生的动应力和重力作用产生的静应力共同作用下的应力状态。通过理论计算和数值模拟表明:对于土质边坡,坡顶附近的土体发生的是拉张破坏,以下部位发生的是剪切破坏;对于岩质边坡,坡顶附近岩体发生的是以结构面的拉张破坏为主的破坏,坡体下部发生剪切破坏;数值模拟的结果与计算结果具有良好的一致性。
Based on the stress state of rock and soil slope,analyzed the stress state of rock and soil mass which contains both the dynamic stress caused by earthquake and static stress caused by gravity.The calculations show that:as to the soil slope,close to the top of slope is tensile failure and below of it is shear failure;for the rock slope,close to the top of slop is tensile failure of structure plane and below of it is shear failure.Numerical simulation has good consistency with calculated results.
Based on the stress state of rock and soil slope,analyzed the stress state of rock and soil mass which contains both the dynamic stress caused by earthquake and static stress caused by gravity.The calculations show that:as to the soil slope,close to the top of slope is tensile failure and below of it is shear failure;for the rock slope,close to the top of slop is tensile failure of structure plane and below of it is shear failure.Numerical simulation has good consistency with calculated results.
引文
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[3]李忠生.国内外地震滑坡灾害研究综述[J].灾害学,2003,18(4):64-70.Li Zhongsheng.The state of the art of the research on seismic land-slide hazard at home and abroad[J].Journal of Catastrophology,2003,18(4):64-70.
[4]黄润秋.汶川8.0级地震触发崩滑灾害机制及其地质力学模式[J].岩石力学与工程学报,2009,28(6):1239-1249.Huang Runqiu.Mechanism and geomechanical modes of landslide hazards triggered by Wenchuan8.0earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(6):1239-1249.
[5]祁生文,伍法权,刘春玲,等.地震边坡稳定性的工程地质分析[J].岩石力学与工程学报,2004,23(16):2792-2797.Qi Shengwen,Wu Faquan,Liu Chunling,et al.Engineering geology analysis on stability of slope under earthauake[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(16):2792-2797.
[6]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):3163-3167.Wang Laigui,Zhao Na,Li Tianbin.Finite element simulation of col-lapse and sliding of slope with single weak plane induced by strong earthquake[J].Chinese Journal of Rock Mechanics and Engineer-ing,2009,28(S1):3163-3167.
[7]Itasca Consulting Group Inc.FLAC2D users manual dynamic analy-sis1-27[R].Minneapolis:Itasca Consulting Group Inc.,2008.
[8]王存玉,王思敬.边坡模型振动实验研究——岩体工程地质问题(七)[M].北京:科学出版社,1987:65-74.
[9]Sun Jinzhong,Tian Xiaofu.Numerical analysis of the influence of structure planes on earthquake motion in rock slopes[A].Geological Engineering Problems in Major Construction Projects[C].Chengdu,2009:451-462.
[10]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1993.
[11]许强,张登项,郑光.锦屏Ⅰ级水电左岸坝肩边坡施工期破坏模式及稳定性分析[J].岩石力学与工程学报,2009,28(6):1184-1192.Xu Qiang,Zhang Dengxiang,Zheng Guang.Failure mode and sta-bility analysis of left bank abutment high slope at Jinping I Hydro-power Station[J].Chinese Journal of Rock Mechanics and Engi-neering,2009,28(6):1184-1192.
[12]王树仁,张海清,慎乃齐,等.下伏采空区隧桥工程变形及受力响应特征分析[J].岩石力学与工程学报,2009,28(6):1144-1151.Wang Shuren,Zhang Haiqing,Shen Naiqi,et al.Analysis of de-formation and stress characteristics of highway tunnels above mined-out regions[J].Chinese Journal of Rock Mechanics and Engineer-ing,2009,28(6):1144-1151.
[13]黄侃,程国明.露天矿高边坡钻孔采矿法的参数研究[J].煤炭学报,2004,29(2):164-166.Huang Kan,Cheng Guoming.Study on the parameters of highwall auger mining in open pit mine[J].Journal of China Coal Society,2004,29(2):164-166.
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