Study on the failure mechanism of expansive soil slope and limit equilibrium analysis method based on fully softening strength

被引：0
作者：
Zhang K. [1 ,2 ]
Sun B. [2 ]
Li W. [3 ]
Nie M. [2 ]
机构：
[1] Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing
[2] Institute of Geotechnical Engineering, Hohai University, Nanjing
[3] Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2022年 / 53卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Expansive soil slope; Failure mechanism; Fully softening strength; Limit equilibrium; Progressive failure;
D O I：
10.11817/j.issn.1672-7207.2022.01.004
中图分类号：
学科分类号：
摘要：
The influence of crack development on soil strength and seepage conditions of slope was studied by the load expansion ratio test, the wet and dry cyclic test and the strength test. Based on the equivalent theory of temperature and humidity field, the expansion of slope induced by the increase of moisture was simulated. The stability of the expansive soil slope was calculated using the wet and dry cyclic strength and the fully softened strength respectively. Considering the slope soil zone partition, the values of strength parameters and the determination of saturation line, a limit equilibrium analysis method for shallow sliding stability of expansive soil slope based on fully softening strength was proposed. The progressive failure process of expansive soil slope was simulated, and the applicability of the proposed method was verified by examples. The results show that with the increase of fissure development and the lift of the location of the infiltration line level, the stability of the expansive soil slope decreases; fissures are the key factors that induce the stability of expansive soil slopes. The reduction of soil strength caused by cracks and the change of seepage conditions are the direct causes of slope instability. The influence of expansion on slope stability is reflected in strength reduction, and so it is not necessary to take into consideration of the influence of expansion additionally in the stability analysis of expansive soil slope. The safety factor of the expansive soil slope calculated by using the wet and dry cyclic strength is in good agreement with that caclulated by using the fully softened strength. The method proposed in this paper can be used to analyze the stability of expansive soil slope. © 2022, Central South University Press. All right reserved.
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页码：75 / 94
页数：19
相关论文
共 36 条
  • [1] LIAO Shiwen, Expansive soil and railway engineering, pp. 265-276, (1984)
  • [2] YIN Zongze, YUAN Junping, WEI Jie, Et al., Influences of fissures on slope stability of expansive soil, Chinese Journal of Geotechnical Engineering, 34, 12, pp. 2155-2161, (2012)
  • [3] ZHANG Aijun, Anying HA, LUO Yasheng, Swelling deformation and calculation methods of compacted expansive soil, Chinese Journal of Rock Mechanics and Engineering, 24, 7, pp. 1236-1241, (2005)
  • [4] HU Jin, WANG Baotian, ZHANG Wenhui, Et al., Deformation trends of expansive soils under free and loading condition, Chinese Journal of Geotechnical Engineering, 33, pp. 342-345, (2011)
  • [5] HUANG Bin, RAO Xibao, WANG Zhangqiong, Et al., Experimental study of expansion model of expansive soil considering state water content and density, Rock and Soil Mechanics, 32, pp. 397-402, (2011)
  • [6] ZHANG Rui, ZHAO Xu, ZHENG Jianlong, Et al., Experimental study and application of lateral swelling stress of expansive soil, China Journal of Highway and Transport, 33, 9, pp. 22-31, (2020)
  • [7] LUO Chong, Study on mechanism of landslides in horizontal-strata in Wanzhou, Chongqing City, Three-Gorges Reservoir, pp. 31-35, (2005)
  • [8] GONG Wenhui, WANG Yuanhan, ZHENG Junjie, Analysis of stability of expansive soil cutting slope in soaking condition, Highway, 52, 10, pp. 96-100, (2007)
  • [9] CHENG Zhanlin, LI Qingyun, GUO Xiling, Et al., Study on the stability of expansive soil slope, Journal of Yangtze River Scientific Research Institute, 28, 10, pp. 102-111, (2011)
  • [10] TERZAGHI K., Stability of slopes of natural clay, Proceedings of the 1st International Conference of Soil Mechanics and Foundation Engineering, pp. 161-165, (1936)
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