Study on Crack Propagation of Rock Bridge in Rock-like Material with Fractures under Compression Loading with Sudden Change Rate

被引:1
作者
Huang, Xuanqi [1 ]
Wan, Wen [1 ,2 ,3 ]
Wang, Min [2 ]
Zhou, Yu [2 ]
Liu, Jie [4 ]
Chen, Wei [4 ]
机构
[1] Hunan Univ Sci & Technol, Sch Civil Engn, Xiangtan 411201, Peoples R China
[2] Hunan Univ Sci & Technol, Sch Resource Environm & Safety Engn, Xiangtan 411201, Peoples R China
[3] Hunan Univ Sci & Technol, Work Safety Key Lab Prevent & Control Gas & Roof D, Xiangtan 411201, Peoples R China
[4] Hunan Inst Engn, Architectural Engn Inst, Xiangtan 411101, Peoples R China
来源
APPLIED SCIENCES-BASEL | 2023年 / 13卷 / 07期
基金
中国国家自然科学基金;
关键词
mechanical damage; micro mechanism; sudden change loading rate; loading rate; crack propagation; STRENGTH;
D O I
10.3390/app13074354
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In order to study the influence of sudden change of loading rate on crack propagation and failure mode of rock bridge of fractured rock mass, the specimens used in this paper were rock-like materials containing two prefabricated fractures. The mechanical properties and the failure mode of the specimens under different constant loading rates and sudden changes in loading rate were tested. The photographic monitoring and acoustic emission were carried out at the same time. The results show that: (1) In the process of sudden change loading, the specimen shows the characteristics of approximate elastic deformation, and the stress-strain curve after sudden loading is similar to the corresponding stress-strain curve at the corresponding constant loading rate. (2) Combined with acoustic emission detection, it is found that when the loading rate is not much different before the mutation, the loading rates is the same after the mutation and the stress-strain curve of the specimen is similar. In the low-speed loading stage, the acoustic emission count is generally low, while in the high-speed loading stage, the acoustic emission count is generally high. The sudden change from low-speed loading to high-speed loading easily induces stress drop, resulting in crack generation and increase of acoustic emission count. (3) The rate of the specimen during the crack development period plays a decisive role in the failure mode of the specimen. Before the sudden change of loading rate, the low-speed loading within a certain range has little effect on the specimen. When the high-speed loading is carried out when the stress is low in the early stage of the mutation, the acoustic emission count of the specimen is high, which will cause some damage inside the specimen. As a result, even if the rate is the same after the mutation, the final peak stress and failure mode may be different.
引用
收藏
页数:17
相关论文
共 22 条
  • [1] Cai M., 2012, ROCK MECH ENG
  • [2] Identifying crack initiation and propagation thresholds in brittle rock
    Eberhardt, E
    Stead, D
    Stimpson, B
    Read, RS
    [J]. CANADIAN GEOTECHNICAL JOURNAL, 1998, 35 (02) : 222 - 233
  • [3] [何松 He Song], 2018, [实验力学, Journal of Experimental Mechanics], V33, P757
  • [4] Li FL, 2021, ROCK SOIL MECH, V42, P369, DOI 10.16285/j.rsm.2020.0846
  • [5] Detection of Cracking Levels in Brittle Rocks by Parametric Analysis of the Acoustic Emission Signals
    Moradian, Zabihallah
    Einstein, Herbert H.
    Ballivy, Gerard
    [J]. ROCK MECHANICS AND ROCK ENGINEERING, 2016, 49 (03) : 785 - 800
  • [6] Strain-rate effects on the strength and fragmentation size of rocks
    Qi, Chengzhi
    Wang, Mingyang
    Qian, Qihu
    [J]. INTERNATIONAL JOURNAL OF IMPACT ENGINEERING, 2009, 36 (12) : 1355 - 1364
  • [7] Analysis on mechanical properties and mesoscopic acoustic emission characteristics of prefabricated fracture cemented paste backfill under different loading rates
    Song, Xuepeng
    Yuan, Quan
    Wang, Shi
    Dong, Zilin
    Hao, Yuxin
    [J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 2023, 30 (09) : 24687 - 24707
  • [8] Experimental and numerical study on peak strength, coalescence and failure of rock-like materials with two folded preexisting fissures
    Wang, Min
    Lu, Zhenxing
    Zhao, Yanlin
    Wan, Wen
    [J]. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2023, 125
  • [9] Numerical study on optimisation of cable length and cable location for roadway support by using of improved SA algorithm
    Wang, Min
    Lu, Zhenxing
    Wan, Wen
    Zhao, Yanlin
    [J]. EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING, 2023, 27 (02) : 609 - 624
  • [10] A calibration framework for the microparameters of the DEM model using the improved PSO algorithm
    Wang, Min
    Lu, Zhenxing
    Wan, Wen
    Zhao, Yanlin
    [J]. ADVANCED POWDER TECHNOLOGY, 2021, 32 (02) : 358 - 369