Study on Tensile Properties of Unsaturated Soil Based on Three Dimensional Discrete Element Method

被引：0
作者：
Cai G. [1 ,2 ]
Wang C. [2 ]
Li J. [3 ]
Xu Z. [2 ]
He X. [4 ]
Zhao C. [2 ]
机构：
[1] Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing
[2] School of Civil Engineering, Beijing Jiaotong University, Beijing
[3] Fujian Academy of Building Research, Fuzhou
[4] University of Natural Resources and Life Sciences, Vienna
来源：
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | 2022年 / 30卷 / 05期
关键词：
Cohesive strength; Degree of saturation; Discrete element method; Macro and grain-scale parameters; Tensile strength; Unsaturated soils;
D O I：
10.16058/j.issn.1005-0930.2022.05.014
中图分类号：
学科分类号：
摘要：
Based on the discrete element method for unsaturated materials proposed by the author, the PFC3D (Particle Flow Code in Three Dimensions) particle flow discrete element analysis program is improved, and a discrete element model suitable for both clay and sand under uniaxial tension is established. The relationship between uniaxial tensile stress and displacement and uniaxial tensile strength are studied. The influence of different microstructure parameters on the tensile failure of soil is explored, and the relationship between saturation and cohesive strength between particles is established by taking uniaxial tensile strength as a bridge. The uniaxial tensile test of clay and sand with different initial void ratio and saturation is studied, and the tensile properties of unsaturated soil and the applicability of discrete element model and program to simulate unsaturated soil are deeply studied. The results show that:among the five microstructure parameters of normal bond strength, shear bond strength, Young's modulus, stiffness ratio and friction coefficient, the influence of normal bond strength on uniaxial tensile simulation is the largest, followed by shear bond strength, Young's modulus and stiffness ratio, and the friction coefficient has the least influence; the uniaxial tensile strength of clay increases at first and then decreases with the increase of saturation. The results show that the increase rate of uniaxial tensile strength on the left side (dry side) is greater than that on the right side (wet side); the uniaxial tensile strength of sand shows a "increase-decrease-increase" rule with the increase of saturation; the simulation results are in good agreement with the experimental results, which verifies the applicability of the discrete element model and the numerical analysis program in the simulation of uniaxial tensile properties of unsaturated materials. © 2022, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.
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页码：1228 / 1244
页数：16
相关论文
共 39 条
  • [1] Fredlund D G., Fredlund D G., The mechanical properties and their engineering applications to unsaturated soils, Chinese Journal of Geotechnical Engineering, 13, 5, pp. 24-35, (1991)
  • [2] Luan Maotian, Li Shunqun, Yang Qing, Theoretical soil-water characteristic curve for unsaturated soils, Chinese Journal of Geotechnical Engineering, 27, 6, pp. 611-615, (2005)
  • [3] Liu Yan, Zhao Chenggang, Cai Guoqing, Et al., Research development of unsaturated soil mechanics, Mechanics in Engineering, 37, 4, pp. 457-465, (2015)
  • [4] Tang Liansheng, Sang Haitao, Luo Zhengui, Et al., Advances in research on the mechanical behavior of the tensilestrengthofsoils, Advances in Earth Science, 30, 3, pp. 297-309, (2015)
  • [5] Du Bin, Bai Haibo, Ma Zhanguo, Et al., Experimental study on the dynamic tensile properties of red-sandstone after cyclic wetting and drying, Chinese Journal of Rock Mechanics and Engineering, 37, 7, pp. 1671-1680, (2018)
  • [6] Zhang Yun, Wang Huimin, Yan Lifen, Test research on tensile properties of compacted clay, Rock and Soil Mechanics, 34, 8, pp. 2151-2157, (2013)
  • [7] Wang Chun, Cheng Luping, Tang Lizhong, Et al., Effects of the unloading rate on dynamic characteristic and failure modes ofrock under high static loads, Chinese Journal of Rock Mechanics and Engineering, 38, 2, pp. 0217-0226, (2019)
  • [8] Lakshmikantha M R, Prat P C, Ledesma A., Discussion on "Experimental study on fracture toughness and tensile strength of a clay"[J], Engineering Geology, 101, 3, pp. 295-296, (2008)
  • [9] Krishnayya A V G, Eisenstein Z, Morgenstern N R., Behavior of compacted soil in tension[J], Journal of the Geotechnical Engineering Division, 100, 9, pp. 1051-1061, (1974)
  • [10] Ran Longzhou, Song Xiangdong, Tang Chaosheng, Laboratorial investigation on tensile strength of expansive soil during drying, Journal ofEngineering Geology, 19, 4, pp. 620-625, (2011)
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