首页|Mechanical response and microscopic damage mechanism of pre-flawed sandstone subjected to monotonic and multilevel cyclic loading:A laboratory-scale investigation

Mechanical response and microscopic damage mechanism of pre-flawed sandstone subjected to monotonic and multilevel cyclic loading:A laboratory-scale investigation

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This study aims to investigate the mechanical response and acoustic emission(AE)characteristic of pre-flawed sandstone under both monotonic and multilevel constant-amplitude cyclic loads.Specifically,we explored how coplanar flaw angle and load type impact the strength and deformation behavior and microscopic damage mechanism.Results indicated that being fluctuated before rising with increasing fis-sure angle under monotonic loading,the peak strength of the specimen first increased slowly and then steeply under cyclic loading.The effect of multilevel cyclic loading on the mechanical parameters was more significant.For a single fatigue stage,the specimen underwent greater deformation in early cycles,which subsequently stabilized.Similar variation pattern was also reflected by AE count/energy/b-value.Crack behaviors were dominated by the fissure angle and load type and medium-scale crack accounted for 74.83%-86.44%of total crack.Compared with monotonic loading,crack distribution of specimen under cyclic loading was more complicated.Meanwhile,a simple model was proposed to describe the damage evolution of sandstone under cyclic loading.Finally,SEM images revealed that the microstruc-tures at the fracture were mainly composed of intergranular fracture,and percentage of transgranular fracture jumped under cyclic loading due to the rapid release of elastic energy caused by high loading rate.

SandstonePre-existing coplanar flawsMultilevel constant-amplitude cyclic loadingMechanical behaviorMicroscopic damage mechanism

Kesheng Li、Shengqi Yang、Chuanxiao Liu、Yun Chen、Guanglei Zhang、Qing Ma

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State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China

School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China

College of Water Conservancy and Civil Engineering,Shandong Agricultural University,Tai'an 271018,China

School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China

State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of China

4207723151574156

2023

10.1016/j.ijmst.2023.11.002

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)

CSTPCDCSCDEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2023.33(12)
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