摘要
针对甘肃省舟曲县立节镇北山滑坡在地震情况下的稳定性及失稳后可能威胁的范围问题,笔者使用显式有限元及动力学大变形方法分析了该滑坡在地震情况下的稳定性及失稳后的破坏过程。首先基于滑坡纵剖面建立二维平面应变模型分析滑坡稳定性及破坏过程,之后使用航测点云数据建立三维滑坡模型进行计算分析。地震条件下三维计算确定的滑坡安全系数结果低于1.0,较二维计算结果低7.7%;三维情况计算出的滑动距离达1.73 km,高于二维情况17%,说明滑坡灾害问题使用二维小变形方法得出结果偏于危险。笔者采用显式有限元、三维及大变形计算方法分析更符合实际,可为滑坡灾害的工程防治提供科学理论依据。
The seismic stability and failure process of Lijie landslide is analyzed using the explicit finite element method with dynamic and large deformation modes.Firstly,the Lijie landslide seismic stability is analyzed with two–dimensional plane strain assumption.Then,a three–dimensional mountain model is established via the point cloud data,and three–dimensional landslide failure process analysis is processed to determine the maximum sliding distance and failure range of the landslide.The results obtained by the explicit finite element,three–dimensional and large deformation method in this paper is more accurate than that of the two–dimensional and small deformation method.This study will propose the theoretical guidance for earthquake resistance and the prevention of earthquake–induced landslide disaster.
作者
丛凯
马宗源
李瑞冬
CONG Kai;MA Zongyuan;LI Ruidong(Gansu Geology Environment Monitoring Institute,Lanzhou 730050,Gansu,China;Guizhou Communications Polytechnic,Guiyang 551400,Guizhou,China)
出处
《西北地质》
CAS
CSCD
北大核心
2023年第2期283-291,共9页
Northwestern Geology
基金
国家自然科学基金项目“超高沥青混凝土心墙堆石坝设计理论与关键技术问题研究”(51979225)
“黄土丘陵植被与淤地坝调控中立侵蚀的协同作用机制”(42177346)
“不同草带空间分布对坡面细沟侵蚀调控机制”(52009103)联合资助。
关键词
地震
滑坡
破坏过程
大变形
显式有限元法
earthquake
landslide
progressive failure process
large deformation
explicit finite element method
