| 基于离散元法的铁路沿线非饱和边坡流动与冲击分析 |
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| 引用本文： | 余朝阳,杨彦海,孙大奇,罗刚,谢伟.基于离散元法的铁路沿线非饱和边坡流动与冲击分析[J].铁道建筑,2022(2):152-157. |
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| 作者姓名： | 余朝阳 杨彦海 孙大奇 罗刚 谢伟 |
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| 作者单位： | 川藏铁路有限公司;四川大学建筑与环境学院;中国国家铁路集团有限公司工程管理中心;中国铁道科学研究院集团有限公司铁道建筑研究所;西南交通大学地球科学与环境工程学院;西南交大（上海）智能系统有限公司 |
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| 基金项目： | 国家重点研发计划(2018YFC1505404);四川省科技厅科技计划(2021YJ0033)。 |
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| 摘 要： | 为降低降雨入渗对铁路边坡安全性的影响,对云南普洱市一铁路修建现场区域内存在的典型非饱和边坡进行稳定性分析。引入了黏附-再黏附模型,并通过模型试验以及离散元法分析不同参数条件下的土体崩塌特征和支护下的最大冲击力。研究结果表明:引入黏附-再黏附模型后的离散元法能很好地再现黏聚力作用下非饱和土边坡的崩塌行为;通过将非饱和土的黏聚力、坡面的摩擦系数等不同参数相结合,可以在坡面流动和冲击试验中获得最大冲击力;当支护上产生最大冲击力时,沉积在支护上的土体可以起到缓冲作用,提高边坡稳定性。
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| 关 键 词： | 铁路边坡 非饱和土 模型试验 离散元法 流动性 冲击 黏聚力 |
Flow and Impact Analysis of Unsaturated Slope Along Railway Based on DEM Method |
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| YU Chaoyang,YANG Yanhai,SUN Daqi,LUO Gang,XIE Wei.Flow and Impact Analysis of Unsaturated Slope Along Railway Based on DEM Method[J].Railway Engineering,2022(2):152-157. |
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| Authors: | YU Chaoyang YANG Yanhai SUN Daqi LUO Gang XIE Wei |
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| Affiliation: | (Sichuan-Tibet Railway Co.Ltd,Chengdu 610041,China;School of Arehitecture and Environment,Sichuan University,Chengdu 610011,China;Engineering Management Center,CHINA RAILWAY,Beijing 100038,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Bejjng 100081,China;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 610036,China;Southwest Jiaotong University(Shanghai)Inelligent System Co.Lid.,Chengdu 610031,China) |
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| Abstract: | In order to reduce the influence of rainfall infiltration on the safety of railway slope,the stability of typical unsaturated slope in a railway construction site in Yunnan Pu’er was analyzed.The adhesive-readhesive model was introduced,and the characteristics of soil collapse under different parameters and the maximum impact force under support conditions were analyzed by model test and discrete element method.The results show that the discrete element method with the adhesive-readhesive model can well reproduce the collapse behavior of unsaturated soil slope under the action of cohesive force.By combining different parameters such as cohesion of unsaturated soil and friction coefficient of slope,the maximum impact force can be obtained in slope flow and impact tests.When the maximum impact force is generated on the support,the soil deposited on the support can play a buffer role and improve the stability of the slope. |
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| Keywords: | railway slope unsaturated soil model test discrete element method mobility impact cohesion |
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