地震作用下松散堆积体崩塌的颗粒流数值模拟
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摘要
应用基于离散单元法理论的二维颗粒流数值模拟程序,探讨了松散堆积体在地震诱发作用下的崩塌过程与规律.通过改变堆积体底部边界的角度模拟不同地震烈度对松散堆积体崩塌规律的影响,并将数值模拟结果与离心模型试验结果进行了比较.结果表明:在地震诱发作用下,松散堆积体的崩塌量占崩塌总量的比重,5度地震烈度时约为5%,偏离临界休止角不到1.0;°6度和7度地震烈度时为18%左右,偏离临界休止角1.0°~2.0°;而8度地震烈度时约为45%,已远远偏离临界休止角近10°.研究结果可供山区道路边坡抗震设防及崩塌体对道路、河流的阻塞评价参考.
The landslip process and law of loose slopes under seismic loading were investigated by using PFC2D(particle flow code in two dimensions) based on the discrete element method.In the numerical simulation,the effect of seismic intensity on the landslip of loose slopes was analyzed by changing the angle of underside due to pseudo-static method,and the numerical simulation results were compared with the exsiting centrifugal test ones.The research results show that the landslip law of loose slopes can be analyzed effectively by a particle flow code model.Under seismic intensities of 5,6 to 7 or 8 degree,landslip scale is respectively about 5%,18% and 45%,and departure from the critical slope is less than 1.0°,1.0° to 2.0° and about 10°,respectively.The numerical simulation results are consistent with the exsiting centrifuge experimental ones.The research provides a reference for the aseismatic design of loose slopes and the evaluation of river and road barrage.
The landslip process and law of loose slopes under seismic loading were investigated by using PFC2D(particle flow code in two dimensions) based on the discrete element method.In the numerical simulation,the effect of seismic intensity on the landslip of loose slopes was analyzed by changing the angle of underside due to pseudo-static method,and the numerical simulation results were compared with the exsiting centrifugal test ones.The research results show that the landslip law of loose slopes can be analyzed effectively by a particle flow code model.Under seismic intensities of 5,6 to 7 or 8 degree,landslip scale is respectively about 5%,18% and 45%,and departure from the critical slope is less than 1.0°,1.0° to 2.0° and about 10°,respectively.The numerical simulation results are consistent with the exsiting centrifuge experimental ones.The research provides a reference for the aseismatic design of loose slopes and the evaluation of river and road barrage.
引文
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[2]丁彦慧,王余庆,孙进忠.地震崩滑与地震参数的关系及其在边坡震害预测中的应用[J].地球物理学报,1999,42(增刊):101-107.
[3]CUNDALL P A.PFC2D user s manual[R].Minnesota:Itasca Consulting Group Inc.,1999.
[4]CUNDALL P A,STRACK O D L.Particle flowcode in 2 dimensions[R].Minnesota:Itasca Consulting Group Inc.,1999.
[5]周健,池永,池毓蔚,等.颗粒流方法及PFC2D程序[J].岩土力学,2000,21(3):271-274.ZHOU Jian,CHI Yong,CHI Yuwei,et al.The method of particle flow and PFC2D code[J].Rock and Soil Mechanics,2000,21(3):271-274.
[6]贝尔J.多孔介质流体动力学[M].李竞生,陈崇希,译.北京:中国建筑工业出版社,1983:91-94.
[7]陈昌凯,阮永芬,熊恩来.地震作用下边坡稳定的动力分析方法[J].地下空间与工程学报,2005,7(1):1054-1057.CHEN Changkai,RUAN Yongfen,XIONG Enlai.Dynamic analysis nethod of slope stability in earthquake function[J].Chinese Journal of Underground Space and Engineering,2005,7(1):1054-1057.
[8]交通部公路规划设计院.公路工程抗震设计规范[M].北京:人民交通出版社,2005:11-15.
[9]杨庆华,姚令侃,齐颖,等.散粒体离心模型自组织临界性及地震效应分析[J].岩土工程学报,2007,29(11):1630-1635.YANG Qinghua,YAO Lingkan,QI Ying,et al.Analysis of self-organized criticality of centrifugal model tests on granularmixtures and earthquake effect[J].Chinese Journal of Geotechnical Engineering,2007,29(11):1630-1635.
[10]杨庆华,姚令侃,任自铭,等.地震作用下松散体斜坡崩塌动力学特性离心模型试验研究[J].岩石力学与工程学报,2008,27(2):368-374.YANG Qinghua,YAO Lingkan,RENZiming,et al.Centrifugal model test on dynamical characteristics of landslips of looseslope under seismic loading[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(2):368-374.
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