循环载荷作用下边坡临空面质点运动轨迹特征探讨
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摘要
循环荷载作用下边坡岩土体容易产生变形破坏,边坡各部位的破坏方式存在不同。基于数值模拟技术,建立2个不同高度的边坡模型,分析了坡肩处质点分别在10Hz垂向压缩和水平剪切循环荷载作用下的运动轨迹特征,并依据物体受力运动与变形之间的关系确定了坡肩潜在的破坏方式。研究表明:2种加载方式下坡肩质点的运动轨迹均呈椭圆形,加载方式和坡高对坡肩质点的运动轨迹及边坡的潜在破坏方式都有一定影响。低边坡坡肩质点在垂向压缩循环荷载下主要表现为垂向振动,该处岩体发生拉破坏的可能性大;在水平剪切循环作用下该质点主要表现为水平向振动,坡肩岩体发生剪破坏的可能性大。对高边坡而言,坡肩质点水平向与垂直向的振动幅值之差较低边坡坡肩质点的明显小,说明高边坡坡肩在这2种循环荷载最有可能产生拉剪破坏。
Under cyclic loading,a slope can be easily deformed and damaged.The failure mode of each part of the slope is different.Based on the technology of numerical simulation,two slopes with different heights are established.
Under cyclic loading,a slope can be easily deformed and damaged.The failure mode of each part of the slope is different.Based on the technology of numerical simulation,two slopes with different heights are established.
引文
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[3]梁庆国,韩文峰,马润勇,谌文武.强地震动作用下层状岩体破坏的物理模拟研究[J]岩土力学,2005,26(8):1307～1311.Liang Qingguo,Han Wenfeng,Ma Runyong,Chen Wenwu.Physis-cal simulation study on dynamic failures of layered rock mass understrong ground motion.Rock and Soil Mechanics,2005,26(8):1307～1311.
[4]王勇智,戚炜,门玉明,彭建兵.强震区岩体动力破坏机制研究[J].岩土力学,2005,26(11):1841～1844.Wang Yongzhi,Qi Wei,Men Yuming,Peng Jianbing.Experimentalresearch of dynamic failure mechanism of rockmass in meizoseismalarea.Rock and Soil Mechanics,2005,26(11):1841～1844.
[5]张振南,葛修润.地震载荷作用下的节理岩体破裂模型.岩石力学与工程学报,2005,24(10):1645～1648.Zhang Zhennan,Ge Xiurun.Fracture model of jointed rock masssubjected to seismic loading.Chinese Journal of Rock Mechanicand Engineering,2005,24(10):1645～1648.
[6]刘亚群,李海波,李俊如,等.爆破荷载作用下黄麦岭磷矿岩质边坡动态响应的UDEC模拟研究[J].岩石力学与工程学报,2004,23(21):3659～3663.Liu Yaquan,Li Haibo,Li Junru,et al.Udec simulation on dynamicresponses of rock slope of Huangmailing phosphorite mine underexplosion.Chinese Journal of Rock Mechanics and Engineering,2004,23(21):3659～3663.
[7]周家文,徐卫亚,石崇.基于3DEC的节理岩体边坡地震影响下的楔体稳定性分析[J].岩石力学与工程学报,2007,26(增1):3402～3409.Zhou Jiawen,Xu Weiya,Shi Chong.Wedge stability analysis ofjointed rockmass slope considering seismic influences based on3DEC.Chinese Journal of Rock Mechanics and Engineering,2007,26(app1):3402～3409.
[8]崔芳鹏,胡瑞林,殷跃平,等.纵横波时差耦合作用的斜坡崩滑效应离散元分析——以北川唐家山滑坡为例[J].岩石力学与工程学报,2010,29(2):319～327.Cui Fangpeng,Hu Ruilin,Yin Yueping,et al.Distinct element a-nalysis of collapsing sliding response of slope triggered by timedifference coupling effects of P and S seismic waves——takingTangjiashan landslide in Beichuan county for example.ChineseJournal of Rock Mechanics and Engineering,2010,29(2):319～327.
[9]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 landslidehazard triggered by Wenchuan 8.0 earthquake.Chinese Journal ofRock Mechanics and Engineering,2009,28(6):1239～1249.
[10]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):1714～1723.Zheng Yingren,Ye Hailin,Huang Runqiu.Analysis and discus-sion of failure mechanics and fracture surface of slope underearthquake.Chinese Journal of Rock Mechanics and Engineering,2009,28(8):1714～1723.
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