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

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外文摘要：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.

外文关键词：

Post-peak stageCyclic loading and unloadingHydromechanical couplingSandstoneWater pressure

作者：

Yanlin Zhao、Jinhai Liu、Chunshun Zhang、Houquan Zhang、Jian Liao、Sitao Zhu、Lianyang Zhang

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作者单位：

School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China

School of Emergency Technology and Management,North China Institute of Science and Technology,Beijing 101601,China

School of Civil Engineering,Wuhan University,Wuhan 430072,China

State Key Laboratory for Geomechanics and Deep Underground Engineering,School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China

School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China

Department of Civil and Architectural Engineering and Mechanics,University of Arizona,Tucson,AZ 85721,USA

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaConstruction Project of Chenzhou National Sustainable Development Agenda Innovation Demonstration Zone

项目编号：

52274118522741452021sfQ18

出版年：

2023

DOI：

10.1016/j.ijmst.2023.05.004

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

年,卷(期)：2023.33(8)

参考文献量4