Small-Strain Stiffness Model of Shear-Zone Soil in a Reactivated Slow-Moving Landslide

被引:0
作者
Wang, Jincheng [1 ]
Cui, Deshan [2 ]
Hu, Xinli [2 ]
Chen, Qiong [2 ]
Chen, Juxiang [3 ]
Wang, Jinge [4 ]
机构
[1] Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China
[2] China Univ Geosci, Fac Engn, Wuhan 430074, Peoples R China
[3] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
[4] China Univ Geosci, Three Gorges Res Ctr Geohazards, Wuhan 430074, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
Slow-moving landslide; Shear-zone soil; Hardening soil (HS)-Small model; Small-strain stiffness; Stiffness parameters; STRENGTH;
D O I
10.1061/IJGNAI.GMENG-10387
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Many slow-moving landslides with pre-existing shear zones exist in the Three Gorges Reservoir (TGR) region. In response to dynamics such as water-level fluctuations, shear-zone soil undergoes repeated small deformations, which sometimes result in slow-moving landslides that accelerate rapidly and fail catastrophically. Therefore, investigating the nonlinear variation of the shear modulus of soil over different strain ranges, especially for small strains, which is not well studied, is important. This paper conducts a series of investigations on shear-zone soil to obtain parameters of the small-strain stiffness [hardening soil (HS)-Small] model, including consolidated drain triaxial unloading-reloading compression, bending elements, and resonant column tests. The parameters were used to analyze the strain and deformation of a reactivated slow-moving landslide in the TGR region through numerical analysis. Correspondingly, in situ deformation monitors carried out in the shear zone are reported. The results illustrate that most regions of the slow-moving landslide are in small-strain states, and the numerical results demonstrate that the HS-Small model shows better consistency for monitoring data than traditional models. Estimation methods for each parameter of the HS-Small model are recommended based on statistical analysis and additional small-strain stiffness tests. A small-strain stiffness prediction empirical formula of shear-zone soil is proposed. The findings demonstrate the potential of the HS-Small model for slow-moving landslides, and the recommended estimation method can be considered for parameter determination.
引用
收藏
页数:18
相关论文
共 48 条
  • [1] The influence of pre-failure soil stiffness on the numerical analysis of tunnel construction
    Addenbrooke, T. I.
    Potts, D. M.
    Puzrin, A. M.
    [J]. GEOTECHNIQUE, 1997, 47 (03): : 693 - 712
  • [2] GEOTECHNICAL PROPERTIES OF SOILS
    ALPAN, I
    [J]. EARTH-SCIENCE REVIEWS, 1970, 6 (01) : 5 - &
  • [3] [Anonymous], Ocean Eng, DOI [10.1016/j.oceaneng.2022.113417, DOI 10.1016/J.OCEANENG.2022.113417]
  • [4] [Anonymous], 2016, STANDARD TEST METHOD, P1
  • [5] [Anonymous], Eng. Geol. 273: 105675, DOI [10.1016/j.enggeo.2020.105675, DOI 10.1016/J.ENGGEO.2020.105675]
  • [6] [Anonymous], Numerical methods in geotechnical engineering: (NUMGE 2010)
  • [7] Benz T., 2007, Small-strain stiffness of soils and its numerical consequences
  • [8] Benz T., 2009, Bautechnik, V86, P16, DOI DOI 10.1002/BATE.200910038
  • [9] THE STRENGTH AND DILATANCY OF SANDS
    BOLTON, MD
    [J]. GEOTECHNIQUE, 1986, 36 (01): : 65 - 78
  • [10] BSI (British Standards Institution), 2016, Methods of test for soils for civil engineering purposesPart 1: General requirements and sample preparation | GlobalSpec