Stability calculation and numerical simulation of multi-stage high loess slopes

被引：0
|
作者：
Yang X.-H. [1 ,2 ]
Lu F. [1 ,2 ]
Guo N. [1 ,2 ]
Zhu Y.-P. [1 ,2 ]
Zhou S.-K. [1 ,2 ]
机构：
[1] School of Civil Engineering, Lanzhou University of Technology, Lanzhou
[2] Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2022年 / 44卷
关键词：
multi-stage high loess slope; numerical simulation; sensitivity analysis; sliding surface search model; stability calculation;
D O I：
10.11779/CJGE2022S1031
中图分类号：
学科分类号：
摘要：
One of the core problems faced by a large number of slope support projects in Northwest China is the stability analysis of multi-stage high slopes. However, most of the existing stability analysis methods are for the sigle-stage high slopes. Based on the Swedish slice method, a method for stability calculation of multi-stage high loess slopes and the relevant sliding surface search model are proposed. The stability algorithm is analyzed by means of the MATLAB software programming and thefinite element simulation. The results show that: (1) The proposed method and the relevant sliding surface search model can be used to evaluate the overall stability of the multi-stage slopes and modified according to the sensitivity analysis. (2) According to the sensitivity analysis, the slope height and the slope ratio are the primary factors to be considered in the design of its grade. At the same time, with the decrease of the gravity, the increase of the cohesion and the increase of the friction angle, the slope stability will be improved. (3) Through the finite element simulation software, it is found that the sliding surface obtained by the proposed sliding surface search model is more accurate, and the sliding surface of the slope has moved back after the support. (4) According to the support case of multi-stage loess slope, it is found that the stress of the joint between the anti-slide piles and the prestressed anchor cable of the frame and the soil in front of the anti-slide piles is high, and the axial tension of the anchor cable in the lower row is large, which should be emphasized in the design of similar projects. The above research results may provide scientific basis for the stability analysis of multi-stage high loess slopes. © 2022 Chinese Society of Civil Engineering. All rights reserved.
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页码：172 / 177
页数：5
相关论文
共 11 条
  • [1] WU Wei-jiang, SU Xing, YE Wei-lin, Et al., Lateral pressure in formation of saturated loess landslide—case study of Heifangtai, Gansu Province[J], Chinese Journal of Geotechnical Engineering, 40, S1, pp. 135-140, (2018)
  • [2] HAVAEJ M, WOLTER A, STEAD D., The possible role of brittle rock fracture in the 1963 Vajont Slide, Italy[J], International Journal of Rock Mechanics and Mining Sciences, 78, pp. 319-330, (2015)
  • [3] SHI Bu-tao, ZHANG Yun, ZHANG Wei, Strength reduction material point method for slope stability, Chinese Journal of Geotechnical Engineering, 38, 9, pp. 1678-1684, (2016)
  • [4] LI Meng-zi, CAI Guo-qing, LI Hao, Et al., Stability of infinite unsaturated soil slopes with tensile strength cut-off, Chinese Journal of Geotechnical Engineering, 42, 4, pp. 705-713, (2020)
  • [5] LIN Shan, GUO Yu-kui, SUN Guan-hua, Et al., Slope stability analysis using the virtual element method and shear strength reduction technique, Chinese Journal of Rock Mechanics and Engineering, 38, S2, pp. 3429-3438, (2019)
  • [6] SHI Wei-min, ZHENG Ying-ren, YE Xiao-ming, Stability analysis on step-shaped slope, Chinese Journal of Rock Mechanics and Engineering, 21, 5, pp. 698-701, (2002)
  • [7] LI Zhong, ZHU Yan-peng, Search model of slip surface and stability analysis of multi-step slope, Chinese Journal of Rock Mechanics and Engineering, 25, S1, pp. 2841-2847, (2006)
  • [8] HU Jin-chuan, XIE Yong-li, WANG Wen-sheng, Study of stability characteristics of multi-stair high cut slope in loess highway, Chinese Journal of Rock Mechanics and Engineering, 29, S1, pp. 3093-3100, (2010)
  • [9] NIAN Ting-kai, LIU Kai, HUANG Run-qiu, Et al., A generalized upper-bound limit analysis approach for stability analysis of complex multistep and multilayer slopes[J], Rock and Soil Mechanics, 37, 3, pp. 842-849, (2016)
  • [10] WAN Liang-peng, XU Yang, LI Jian-lin, Et al., Sensitivity analysis of the effect of rock mass parameters on slope stability evaluation: a case study of abutment slope of Dagangshan[J], Rock and Soil Mechanics, 37, 6, pp. 1737-1744, (2016)
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