基于强度折减动力分析法的岩体边坡稳定性分析
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摘要
针对在强度折减动力分析法中折减系数与关键点位移关系曲线拐点不易判断的问题,采用强度折减法将边坡岩土体的内聚力、内摩擦角、抗拉强度折减后,利用数值分析软件进行静动力计算,以边坡潜在滑动体关键点位移时程曲线和折减系数与关键点位移关系曲线判断出折减系数的范围,通过分析绘制在同一坐标系下不同折减系数时潜在滑动体关键点位移时程曲线的变化趋势,较为准确地确定拐点及其相应的稳定安全系数,并以浩口水电站厂房后缘边坡为例,通过对其进行动力稳定性分析,验证了所提方法的可行性和合理性。
There exist limitations when evaluating the seismic stability of a slope by traditional pseudo-static method or time history of safety factor analysis method.Static and dynamic calculations are conducted after reduction of shear strength and tensile strength.Stability and the safety factor are estimated based on the trend of the key points' displacements and reduction factor-displacement curves of the key points at the end of the earthquake.A relatively accurate inflection point and corresponding safety factor are determined through analysis of the key points' displacements under different reduction factor in the same coordinate system.As an application of this method,the seismic stability of a slope behind Haokou hydropower plant is evaluated and the safety factor under earthquake is obtained,which verifies the feasibility and rationality of the proposed method for slope stability analysis.
There exist limitations when evaluating the seismic stability of a slope by traditional pseudo-static method or time history of safety factor analysis method.Static and dynamic calculations are conducted after reduction of shear strength and tensile strength.Stability and the safety factor are estimated based on the trend of the key points' displacements and reduction factor-displacement curves of the key points at the end of the earthquake.A relatively accurate inflection point and corresponding safety factor are determined through analysis of the key points' displacements under different reduction factor in the same coordinate system.As an application of this method,the seismic stability of a slope behind Haokou hydropower plant is evaluated and the safety factor under earthquake is obtained,which verifies the feasibility and rationality of the proposed method for slope stability analysis.
引文
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[2]Newmark N M.Effects of Earthquakes on Dams and Embankments[J].Geotechnique,1965,15(2):139-160.
[3]刘汉龙,费康,高玉峰.边坡地震稳定性时程分析方法[J].岩土力学,2003,24(4):553-556,560.
[4]Pal S,Kaynia A M,Bhasin R K,et al.Earthquake Stability Analysis of Rock Slopes:a Case Study[J].Rock Mechanics and Rock Engineering,2012(45):205-215.
[5]李海波,肖克强,刘亚群.地震荷载作用下顺层岩质边坡安全系数分析[J].岩石力学与工程学报,2007,26(12):2 385-2 394.
[6]Fawu Wang,Qiangong Chen,Highland L,et al.Preliminary Investigation of Some Large Landslides Triggered by the 2008 Wenchuan Earthquake,Sichuan Province,China[J].Landslides,2009,6(1):47-54.
[7]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.
[8]郑颖人,赵尚毅,李安洪,等.有限元极限分析法及其在边坡中的应用[M].北京:人民交通出版社,2011.
[9]戴妙林,张胤,陈威,等.白鹤滩水电站左岸#2潜在滑动体动力稳定性分析[J].水电能源科学,2011,29(3):113-115.
[10]郑颖人,叶海林,黄润秋,等.边坡地震稳定性分析探讨[J].地震工程与工程振动,2010,30(2):173-180.
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