| 碎石土路堑高边坡地震动力响应过程分析 |
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| 引用本文： | 王飞,吴红刚,郭春香.碎石土路堑高边坡地震动力响应过程分析[J].中国地质灾害与防治学报,2020,31(1):18-24. |
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| 作者姓名： | 王飞 吴红刚 郭春香 |
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| 作者单位： | 兰州交通大学土木工程学院;西部环境岩土及场地修复技术工程实验室;中铁西北科学研究院有限公司;中国中铁滑坡工程实验室 |
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| 基金项目： | 国家重点研发计划资助项目(2018YFC1504903);云南省交通运输厅(云交科教(2017)37号-1);甘肃省自然科学基金(145RJZA068) |
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| 摘 要： | 以功东高速大营盘碎石土深路堑高边坡为研究对象,对其用有限差分软件FLAC3D模拟分析,在低频高幅的地震波作用下,深入考虑网格划分和输入波以保证模拟的准确性,以此来研究高烈度地区地震作用下高边坡开挖及时支护的工序下的自然和降雨工况不同的变形和动力响应规律。结果表明:（1）在静力开挖支护阶段,开挖主要影响范围为开挖面附近的土体,位移主要为回弹变形,随着开挖深度的增加,回弹位移增加变缓。向下坡方向的位移趋势从坡脚开始产生,在降雨工况下所有坡面测点均产生向下坡方向位移。（2）地震作用下,坡体会产生多条剪切带倾泄能量,而地震降雨工况下产生坡顶到坡脚的贯通剪切带,成整体失稳趋势。（3）输入地震波峰值及其在此峰值点的位移响应存在时间差,且此点位移也不是位移最大值,降雨对中上部坡体位移影响较大,会使位移较自然工况下几乎成倍增加。（4）在地震中下坡方向的水平位移越大,其加速度响应越有降低的趋势,且越往坡体内部,降雨对加速度响应影响越不明显。
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| 关 键 词： | 地震 FLAC3D 动力响应 高边坡 开挖及时支护 |
Dynamic response of high cut based a numerical simulation slope to earthquake |
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| WANG Fei,WU Honggang,GUO Chunxiang.Dynamic response of high cut based a numerical simulation slope to earthquake[J].The Chinese Journal of Geological Hazard and Control,2020,31(1):18-24. |
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| Authors: | WANG Fei WU Honggang GUO Chunxiang |
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| Institution: | (Lanzhou Jiaotong University School of Civil Engineering, Lanzhou, Gansu 730070, China;Western Environmental Geotechnical and Site Rehabilitation Technology Engineering Laboratory, Lanzhou, Gansu 730000, China;China Northwest Research Institute Co. Ltd.of CREC, Lanzhou, Gansu 730000, China;China Railway Landslide Engineering Laboratory, Lanzhou, Gansu 730000, China) |
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| Abstract: | Taking the deep cutting high gravel soil slope in Gongdong Expressway as the research object,the finite difference software FLAC3D is used for simulation analysis,and the meshing and inputting waves are deeply considered to ensure the accuracy of the simulation,so as to study earthquake induced deformation and response characteristics of high cutting slope under natural and rainfall conditions.The results show that:(1)In the stage of static excavation and support,the main influence range of excavation was near the excavation face,and the displacement was mainly spring back deformation,the rebound displacement increases slowly with the increase of excavation depth.The displacement trend in the downward slope direction was generated from the slope foot.Under the rain condition,all the slope measurement points were displaced downwards.(2)Under earthquake,the slope body will produce multiple shear zone dumping energy,and under the earthquake and rainfall condition,a penetrating shear zone from the top to the foot of the slope was formed,which became the overall instability trend.(3)There was a time gap between the peak input seismic wave and its displacement response at this peak point,and the displacement at this point was not the maximum displacement.The rainfall has a greater influence on the displacement of the upper middle slope,which will almost multiplied the displacement under natural conditions.(4)The larger the horizontal displacement in the downhill direction during the earthquake,the more decreasing of the acceleration,from the slope surface to the inner slope,the influence of rainfall on the acceleration response is weakened. |
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| Keywords: | earthquake FLAC^3D dynamic response high slope excavation timely support |
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