平面滑动型岩质边坡地震动力响应
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摘要
为探讨地震荷载作用下顺层岩质边坡的失稳机理,采用疲劳强度理论分析地震载荷作用下边坡岩体力学性质的变化.将地震波简化为弹性波,对结构面产生等效静态应力,得出了顺层边坡沿结构面失稳的破坏判据,并以汶川地震中唐家山高速滑坡为例,验证了破坏判据的合理性.研究表明,顺层边坡沿结构面失稳主要取决于结构面倾角、内摩擦角、结构面两侧岩体的波阻抗以及地震波入射角,横波是造成边坡失稳的主要因素.对于唐家山高速滑坡,纵波最危险的入射角为0°和10°,横波最危险的入射角为10°和20°.
In order to investigate the stability-loss mechanism of a cataclinal rock slope under earthquake loading,the fatigue strength theory was used to investigate the changes of its mechanical properties under the action of the loading.Seismic waves were simplified as elastic waves to generate equivalent static stresses on a structural plane,and a stability-loss criterion about cataclinal rock slope sliding along the structural plane was obtained.Through taking Tangjiashan landsliding in the Wenchuan earthquake as an example,the rationality of the stability-loss criterion was verified.The research result indicates that sliding of a cataclinal rock slope along a structural plane depends mainly on the dip angle and internal friction angle of the structural plane,the wave impedance of rock masses on the both sides of the structural plane and the incident angle of seismic waves,and the transverse wave is the main factor causing the stability-loss of cataclinal rock slopes.To the Tangjiashan landsliding,the most dangerous incident angle is 0° and 10° to the longitudinal wave and 10° and 20° to the transverse wave.
In order to investigate the stability-loss mechanism of a cataclinal rock slope under earthquake loading,the fatigue strength theory was used to investigate the changes of its mechanical properties under the action of the loading.Seismic waves were simplified as elastic waves to generate equivalent static stresses on a structural plane,and a stability-loss criterion about cataclinal rock slope sliding along the structural plane was obtained.Through taking Tangjiashan landsliding in the Wenchuan earthquake as an example,the rationality of the stability-loss criterion was verified.The research result indicates that sliding of a cataclinal rock slope along a structural plane depends mainly on the dip angle and internal friction angle of the structural plane,the wave impedance of rock masses on the both sides of the structural plane and the incident angle of seismic waves,and the transverse wave is the main factor causing the stability-loss of cataclinal rock slopes.To the Tangjiashan landsliding,the most dangerous incident angle is 0° and 10° to the longitudinal wave and 10° and 20° to the transverse wave.
引文
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[4]黄理兴,陈奕柏.我国岩石动力学研究状况与发展[J].岩石力学与工程学报,2003,22(11):1881-1886.HUANG Lixing,CHEN Yibai.Rock dynamics inChina:Past,present and future[J].Chinese Journal ofGeotechnical Engineering,2003,22(11):1881-1886.
[5]李海波,蒋会军,赵坚,等.动荷载作用下岩体工程安全的几个问题[J].岩石力学与工程学报,2003,22(11):1887-1891.LI Haibo,JIANG Huijun,ZHAO Jian,et al.Someproblems about safety analysis of rock engineering underdynamic load[J].Chinese Journal of GeotechnicalEngineering,2003,22(11):1887-1891.
[6]胡聿贤.地震安全性评价技术教程[M].北京:地震出版社,1999:154-160.
[7]王义锋,郑文棠,石崇.岩质高边坡的地震时程响应分析[J].三峡大学学报:自然科学版,2008,6(3):30-36.WANG Yifeng,ZHENG Wentang,SHI Chong.Seismictime-history response analysis of high rock slopes[J].Journal of China Three Gorges Uniersot:NaturalSciences,2008,6(3):30-36.
[8]陈顒,黄庭芳.岩石物理学[M].北京:北京大学出版社,2001:40-57.
[9]张倬元.工程地质分析原理[M].北京:地质出版社,1994:119-123.
[10]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 characteristicsof large landslides triggered by 5.12 Wenchuanearthquake[J].Journal of Engineering Geology,2008,16(6):721-729.
[11]黄润秋,裴向军,李天斌.汶川地震触发大光包巨型滑坡基本特征及形成机理分析[J].工程地质学报,2008,16(6):730-742.HUANG Runqiu,PEI Xiangjun,LI Tianbin.Basiccharacteristics and formation mechanism of the largestscale landslide at Daguangbao occurred during theWenchuan earthquake[J].Journal of EngineeringGeology,2008,16(6):730-742.
[12]胡卸文,黄润秋,施裕兵,等.唐家山滑坡堵江机制及堰塞坝溃坝模式分析[J].岩石力学与工程学报,2009,28(1):181-189.HU Xiewen,HUANG Runqiu,SHI Yubing,et al.Analysis of blocking river mechanism of Tangjiashanlandslide and dam-breaking mood of its barrier dam[J].Chinese Journal of Geotechnical Engineering,2009,28(1):181-189.
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