Analysis of the Embankment Stability in Permafrost Regions based on Double Strength Reduction Finite Element Method

2018 International Conference on Civil and Hydraulic Engineering

土木建筑工程;水利工程

He, B.B.^1,2 ; Sheng, Y.^1 ; Chou, Y.L.^3,4 ; Hu, X.Y.^1,2 ; Feng, Y.L.^5

State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou

730000, China^1

University of Chinese Academy of Sciences, Beijing

100049, China^2

Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, Gansu

730050, China^3

Northwest Center for Disaster Mitigation in Civil Engineering, Ministry of Education, Lanzhou University of Technology, Lanzhou, Gansu

730050, China^4

School of Civil Engineering, Central South University, Changsha

410075, China^5

关键词: Critical length;    Embankment in permafrost region;    Embankment stability;    Longitudinal cracks;    Permafrost region;    Strength reduction finite element method;    Thaw bulb;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/189/2/022022/pdf
DOI  :  10.1088/1755-1315/189/2/022022

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

In order to study the embankment stability in permafrost regions, the vertical deepening and horizontal extension of the thaw bulb under the embankment in permafrost regions have been calculated and analyzed based on the double strength reduction finite element method. The vertical depth of the thaw bulb has less impact on the location of longitudinal cracks, and greater impact on the size of cracks on the embankment surface. Moreover, the deeper the vertical depth of the thaw bulb is, the larger the size of cracks becomes. The horizontal extension of the thaw bulb not only impacts on the location of longitudinal cracks on the embankment surface, but also impacts on the size of cracks. There is a critical length for the horizontal extension of the thaw bulb, where the probability of longitudinal cracks is the greatest. When the length is smaller than the critical length, the probability of longitudinal cracks increases with the length increasing; when the length is greater than the critical length, there will be no longitudinal cracks, but the whole embankment tilts to the sunny slope.