Study on characteristic strength anisotropy of layered chlorite schist under uniaxial compression

被引：0
|
作者：
Huang S. [1 ]
Zhong P. [1 ]
Ding X. [1 ]
机构：
[1] Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2021年 / 40卷
基金：
中国国家自然科学基金;
关键词：
Characteristic strength; Crack strain model method; Mechanical properties; Rock mechanics; Stratified rock mass; Transversely isotropic;
D O I：
10.13722/j.cnki.jrme.2021.0667
中图分类号：
学科分类号：
摘要：
The theory of traditional crack strain model is mainly based on isotropic body. It has obvious limitations to obtain the characteristic strength of layered rock mass by using this method. In order to study the characteristic strength of layered rock mass, based on the transversely isotropic theory, a transversely isotropic crack strain method is proposed to solve the characteristic strength of layered rock mass. Combined with the uniaxial compression test of chlorite schist, the deformation and failure law of chlorite schist and the characteristic strength characteristics such as closure strength, crack initiation strength, damage strength and peak strength are obtained, and the relationship between these characteristic strength and peak strength, as well as their anisotropic characteristics are analyzed. The results show that the ratio of closure strength to peak strength is in the range of 0.1-0.3, that of crack initiation strength to peak strength is in the range of 0.3-0.5, and that of damage strength to peak strength is in the range of 0.8-1.0. The closure strength, crack initiation strength, damage strength and peak strength of chlorite schist first decrease and then increase with the increase of the angle between loading direction and bedding plane. The anisotropy of crack damage strength and peak strength is between 3 and 4 with moderate anisotropy, and the crack closing strength and initiation strength is between 4 and 5, with high anisotropy. © 2021, Science Press. All right reserved.
引用
收藏
页码：3182 / 3190
页数：8
相关论文
共 18 条
  • [1] TIEN Y M, KUO M C, JUANG C H., An experimental investigation of the failure mechanism of simulated transversely isotropic rocks, International Journal of Rock Mechanics and Mining Sciences, 43, 8, pp. 1163-1181, (2006)
  • [2] CHEN Yongze, LIU Junxin, MAO Haijun, Et al., Experimental study on the anisotropy of mechanical properties of shale under uniaxial compression, Metal Mine, 44, 12, pp. 33-37, (2015)
  • [3] HOU Zhenkun, YANG Chunhe, GUO Yintong, Et al., Anisotropy characteristics of Longmaxi Formation shale under uniaxial compression, Rock and Soil Mechanics, 36, 9, pp. 2541-2550, (2015)
  • [4] LI Ang, SHAO Guojian, SU Jingbo, Et al., Laboratory uniaxial compression test and numerical model of soft and hard interbedded rock mass, Journal of Hohai University: Natural Science, 46, 6, pp. 533-538, (2018)
  • [5] CHO J W, KIM H, JEON S, Et al., Deformation and strength anisotropy of Asan gneiss, Boryeong shale, and Yeoncheon schist, International Journal of Rock Mechanics and Mining Sciences, 50, pp. 158-169, (2012)
  • [6] NIANDOU H, SHAO J F, HENRY J P, Et al., Laboratory investigation of the mechanical behaviour of tournemire shale, International Journal of Rock Mechanics and Mining Sciences, 35, 1, pp. 3-16, (1998)
  • [7] HENG Shuai, YANG Chunhe, ZHANG Baoping, Et al., Experimental study on anisotropy characteristics of shale, Rock and Soil Mechanics, 36, 3, pp. 609-616, (2015)
  • [8] HAO X J, WANG S H, XU Q S, Et al., Influences of confining pressure and bedding angles on the deformation, fracture and mechanical characteristics of slate, Construction and Building Materials, 243, pp. 1-11, (2020)
  • [9] ZHOU Hui, MENG Fanzhen, LU Jingjing, Et al., Discussion on the method of evaluating crack initiation strength and damage strength of hard rock, Rock and Soil Mechanics, 35, 4, pp. 913-918, (2014)
  • [10] WANG Yu, LI Xiao, BEN Yuxing, Et al., Prediction of initial stress of brittle rock dilatation: A case study of granite and diorite, Chinese Journal of Rock Mechanics and Engineering, 33, 4, pp. 737-746, (2014)
12