基于颗粒流的地震液化型滑坡运动学特征分析  

Kinematic characteristics analysis of seismic liquefaction landslide based on particle flow

作　　者：常晁瑜 徐久欢 薄景山[1,2,3] 杨济源 孙雪晨 顾骏 CHANG Chaoyu;XU Jiuhuan;BO Jingshan;YANG Jiyuan;SUN Xuechen;GU Jun(Institute of Disaster Prevention,Sanhe 065201,China;Key Laboratory of Building Damage Mechanism and Defense,China Earthquake Administration,Sanhe 065201,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China)

机构地区：[1]防灾科技学院,河北三河065201 [2]中国地震局建筑物破坏机理与防御重点实验室,河北三河065201 [3]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080

出　　处：《地震工程与工程振动》2022年第6期153-161,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(U1939209);中国地震局建筑物破坏机理与防御重点实验室开放基金项目(FZ201101);河北省高等学校科学研究计划(QN2021309)。

摘　　要：掌握滑坡运动学特征,针对运动学特征提出防治措施是减轻滑坡灾害的关键。在野外调查资料与土工试验的基础上,基于颗粒流离散元方法,研究了西吉县兴平乡堡湾村下马达子滑坡的发生过程,探索了黄土地震液化型滑坡的发生机理和运动规律,通过与未液化的地震滑坡进行对比,分析了地震液化对滑坡运动的影响,归纳地震液化型滑坡的运动学特征。具体分析结论如下:(1)液化模型较未液化模型更容易发生失稳破坏,速度更大、滑距更远、破坏性更强;(2)无论是液化模型还是未液化模型,坡肩位置都是地震滑坡发生失稳的关键部位;(3)斜坡液化后,在液化区附近的区域滑体会推动和冲击下部滑坡体,造成斜坡更大面积的失稳,这是液化型地震滑坡具有低角度,强破坏力特征的原因之一。Mastering the kinematic characteristics of landslide and proposing prevention measures according to the kinematic characteristics are the keys to reduce landslide disasters.On the basis of field investigation data and geotechnical test,the occurrence process of Xiamadazi landslide in Baowan village,Xingping township,Xiji county was studied by using particle flow discrete element method,and the occurrence mechanism and motion law of loess seismic liquefaction landslide were explored.By comparing with the seismic landslide without liquefaction,the influence of seismic liquefaction on landslide motion was analyzed,and the kinematic characteristics of seismic liquefaction landslide were summarized.The conclusions are as follows:(1)Liquefaction model is more prone to instability failure than non-liquefaction model,with greater speed,farther sliding distance and stronger destructiveness;(2)Whether the liquefaction model or the non-liquefaction model,the slope shoulder position is the key part of the instability of seismic landslide;(3)After the slope is liquefied,the regional landslide near the liquefied area experiences to push and impact the lower landslide body,resulting in a larger area of instability of the slope,which is one of the reasons for the characteristics of liquefied seismic landslide with low angle and strong destructive force.

关 键 词：黄土地震滑坡 液化型滑坡 离散元 PFC2D 运动学特征 

分 类 号：TU43[建筑科学—岩土工程]