Study on damage size effect of cemented gangue backfill body under uniaxial compression

被引：0
|
作者：
Guo Y. [1 ,2 ]
Zhao Y. [1 ,2 ]
Feng G. [1 ,2 ]
Ran H. [1 ,2 ]
Zhang Y. [1 ,2 ]
机构：
[1] College of Mining Engineering, Taiyuan University of Technology, Taiyuan
[2] Shanxi Province Research Centre of Green Mining Engineering Technology, Taiyuan
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2021年 / 40卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Acoustic emission; Cemented gangue backfill body; Damage model; Failure mode; Micro morphology; Mining engineering; Resistivity; Size effect;
D O I：
10.13722/j.cnki.jrme.2021.0527
中图分类号：
学科分类号：
摘要：
In order to study the influence of size on damage and failure of cemented gangue backfill body(CGBB), cube specimens with sizes of 70.7, 100, 150, 200 and 300 mm were prepared for uniaxial compression test. The acoustic emission(AE) and resistivity values of specimens during loading were monitored, and the micro morphology of the specimens was observed by scanning electron microscope. The damage evolution and failure mode of CGBB with different sizes were discussed. The results show that the uniaxial compressive strength of CGBB decreases with increasing the size, and the failure mode of CGBB gradually changes from splitting failure to shear failure with increasing the size. The smaller CGBB shows stronger AE activity in the initial compaction stage than in the post-peak failure stage. The sudden change of AE ringing and the stable stage of resistivity can be used as the precursor to judge the failure of CGBB. According to the test results, a calculation formula of size effect law of the compressive strength of CGBB and a damage constitutive model of CGBB with different sizes were established, which can provide reference for the design of backfill body in structural backfill. © 2021, Science Press. All right reserved.
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页码：2434 / 2444
页数：10
相关论文
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