基于颗粒离散元的土质路基高边坡破坏机制研究  

Research on Failure Mechanism of Soil Subgrade High Slope Based on Particle Discrete Element Method

作　　者：于超 YU Chao(Chenghe Ruizheng Risk Management Consulting Co.,Ltd.,Beijing 100855,China)

机构地区：[1]诚合瑞正风险管理咨询有限公司,北京100855

出　　处：《国防交通工程与技术》2022年第4期19-22,共4页Traffic Engineering and Technology for National Defence

摘　　要：土质路基高边坡稳定性问题一直困扰着岩土工作者,国家铁路及公路工程每年在路基高边坡治理方面花费巨大。结合京港澳高速公路小河段路基高边坡工程,基于颗粒离散元PFC^(2D),通过双轴标定试验,建立了细观参数与小河段路基高边坡土体宏观参数对应关系,将其引入到数值边坡模型,从大变形层面分析小河段边坡滑坡破坏特征及运动特征。研究分析发现:高边坡滑动过程呈现逐级差异破坏,边坡以上部土体出现拉裂开始,而后下部土体从坡脚剪出,最后中间土体不断出现拉裂纹,呈块体形态。Geotechnical workers have always been troubled by the stability of high slopes of soil subgrades,and the national railway and highway projects spend a lot of money on the treatment of high subgrade slopes every year.Combined with the Xiaohe section of the Beijing-Hong Kong-Macao Expressway,based on the particle discrete element PFC^(2D),through the biaxial calibration test,the corresponding relationship between the mesoscopic parameters and the macroscopic parameters of the soil of the subgrade high slope in the Xiaohe section is established,which is introduced into the numerical slope model to analyze the destruction features and motion features of the slope and landslide of the Xiaohe section from the large deformation levels.The research and analysis find that the sliding process of the high slope presents a gradual and differential failure.The tensile cracks begin to appear in the upper soil of the slope,and then the lower soil is sheared from the toe of the slope.Finally,the tensile cracks continue to appear in the intermediate soil and the soil is then in the form of blocks.

关 键 词：土质路基 高边坡 破坏机制 颗粒离散元 运动特性 

分 类 号：U416.14[交通运输工程—道路与铁道工程]