A study on forming mechanism of shear bands and visual shearing tests of sand

被引：0
|
作者：
Wang Z.-H. [1 ]
Zhang R.-Y. [1 ]
Jing X.-K. [1 ]
Xiao C.-Z. [1 ]
Huang D. [1 ]
机构：
[1] School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin
来源：
Gongcheng Lixue/Engineering Mechanics | 2022年 / 39卷 / 07期
关键词：
Direct shear test; Image measurement; Sand; Shear band; Soil mechanics; Visualization;
D O I：
10.6052/j.issn.1000-4750.2021.04.0283
中图分类号：
学科分类号：
摘要：
By visual reformation on traditional shear instrument, and combining digital image deformation measurement technology, it studies the forming mechanism and expansion processes of shear bands of sand samples with different sizes in shearing tests. The effects of sample sizes on sand strength are concluded. With the typical sample size, the evolution laws of shear bands (especially for secondary shear bands) in different shearing courses and various normal stresses are summarized. And the force analyses of arch damage areas discovered in tests are carried out. The strength parameters of primary and secondary shear bands are compared. The results show that sample sizes have influences on strength parameters. When the ratios of long to short side are greater than 2, test results deviate from average. When the ratios of long to short side are greater than 4, serious errors are caused. The shear failure areas are not always developed along horizontal shearing gap. The upward arch secondary shear bands are gradually formed in middle and lower part of upper boxes, and shear failure areas are developed along the primary and secondary shear bands. The arch failure areas decrease with the increasing shear displacements and decreasing normal stresses. The normal and tangential stresses on secondary shear bands are larger than those on primary shear bands. The strength indexes of primary and secondary shear bands are basically the same, which indirectly proves the rationality of the existence of secondary shear bands. Copyright ©2022 Engineering Mechanics Press. All rights reserved.
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页码：217 / 226
页数：9
相关论文
共 21 条
  • [1] Tatsuoka F, Nakamura S, Huang C C, Et al., Strength anisotropy and shear band direction in plane strain tests on sand [J], Soils and Foundations, 30, 1, pp. 35-54, (1990)
  • [2] Wang J, Gutierrez M., Discrete element simulations of direct shear specimen scale effects [J], Geotechnique, 60, 5, pp. 359-409, (2010)
  • [3] Kozicki J, Niedostatkiewicz M, Tejchman J, Et al., Discrete modelling results of a direct shear test for granular materials versus FE results [J], Granular Matter, 15, 5, pp. 607-627, (2013)
  • [4] Shao Longtan, Liu Gang, Guo Xiaoxia, Effects of strain localization of triaxial samples in post-failure state, Chinese Journal of Geotechnical Engineering, 38, 3, pp. 385-394, (2016)
  • [5] Li Hang, Lu Ye, Sun Kang, PFC numerical simulation of direct shear tests on standard sand, Journal of Shanghai University (Natural Science Edition), 23, 5, pp. 780-788, (2017)
  • [6] Yang Sheng, Li Xiaoqing, Shear simulation and macro meso analysis of sand based on PFC3D, Chinese Journal of Computational Mechanics, 36, 6, pp. 777-783, (2019)
  • [7] Hong Yong, Li Zirui, Tang Shaoshuai, Et al., Effect of average particle size on shear properties of sand and its mesomechanical analysis, Journal of Jilin University (Earth Science Edition), 50, 6, pp. 1814-1822, (2020)
  • [8] Wang Pengpeng, Guo Xiaoxia, Sang Yong, Et al., Full-field deformation measurement of sand using the digital image correlation technique and numerical simulation using the discrete element method, Engineering Mechanics, 37, 1, pp. 239-247, (2020)
  • [9] Wang Xuan, Xu Ming, Discrete element simulation of the shear behavior of cemented methane hydrate-bearing sands, Engineering Mechanics, 38, 2, pp. 44-51, (2021)
  • [10] Lu Yingfa, Zhang Lingchen, Zhang Yufang, Et al., Multi parameter evaluation index of progressive failure of landslide, Engineering Mechanics, 38, 3, pp. 132-147, (2021)
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