矿业科学技术学报(英文版)2023，Vol.33Issue(8) ：927-947.DOI:10.1016/j.ijmst.2023.05.004

Mechanical behavior of sandstone during post-peak cyclic loading and unloading under hydromechanical coupling

Yanlin Zhao Jinhai Liu Chunshun Zhang Houquan Zhang Jian Liao Sitao Zhu Lianyang Zhang
矿业科学技术学报(英文版)2023，Vol.33Issue(8) ：927-947.DOI:10.1016/j.ijmst.2023.05.004
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  • 维普
  • 万方数据

Mechanical behavior of sandstone during post-peak cyclic loading and unloading under hydromechanical coupling

Yanlin Zhao 1Jinhai Liu 2Chunshun Zhang 3Houquan Zhang 4Jian Liao 1Sitao Zhu 5Lianyang Zhang6
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作者信息

  • 1. School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China
  • 2. School of Emergency Technology and Management,North China Institute of Science and Technology,Beijing 101601,China
  • 3. School of Civil Engineering,Wuhan University,Wuhan 430072,China
  • 4. State Key Laboratory for Geomechanics and Deep Underground Engineering,School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China
  • 5. School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China
  • 6. Department of Civil and Architectural Engineering and Mechanics,University of Arizona,Tucson,AZ 85721,USA
  • 折叠

Abstract

This paper investigates mechanical behaviours of sandstone during post-peak cyclic loading and unload-ing subjected to hydromechanical coupling effect,confirming the peak and residual strengths reduction laws of sandstone with water pressure,and revealing the influence of water pressure on the upper limit stress and deformation characteristics of sandstone during post-peak cyclic loading and unloading.Regarding the rock strength,the experimental study confirms that the peak strength σp and residual strength σr decrease as water pressure P increases.Especially,the normalized strength parameters σp/σpk and σr/σre was negatively and linearly correlated with the P/σ3.Moreover,the Hoek-Brown strength criterion can be applied to describe the relationship between effective peak strength and effective con-fining stress.During post-peak cyclic loading and unloading,both the upper limit stress σp(i)and crack damage threshold stress σcd(i)of each cycle tend to decrease with the increasing cycle number.A hystere-sis loop exists among the loading and unloading stress-strain curves,indicating the unloading deforma-tion modulus Eunload is larger than the loading deformation modulus Eload.Based on experimental results,a post-peak strength prediction model related to water pressure and plastic shear strain is established.

Key words

Post-peak stage/Cyclic loading and unloading/Hydromechanical coupling/Sandstone/Water pressure

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基金项目

National Natural Science Foundation of China(52274118)

National Natural Science Foundation of China(52274145)

Construction Project of Chenzhou National Sustainable Development Agenda Innovation Demonstration Zone(2021sfQ18)

出版年

2023
矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCD北大核心EI
影响因子：1.222
ISSN：2095-2686
参考文献量4
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