Study on size effect of damage evolution of cemented backfill

被引：0
|
作者：
Cheng A. [1 ,2 ,3 ]
Dai S. [1 ,2 ]
Zhang Y. [1 ,2 ]
Huang S. [1 ,2 ]
Ye Z. [1 ,2 ]
机构：
[1] School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, 430081, Hubei
[2] Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Resources, Wuhan University of Science and Technology, Wuhan, 430081, Hubei
[3] Key Laboratory of Ministry of Education of China for Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2019年 / 38卷
基金：
中国国家自然科学基金;
关键词：
Acoustic emission; Cemented backfill; Mechanical properties; Rock mechanics; Size effect; Ultrasonic;
D O I：
10.13722/j.cnki.jrme.2018.1413
中图分类号：
学科分类号：
摘要：
The size effect is an important factor affecting the uniaxial compressive strength, forms of deformation and damage evolution of cemented backfill. Based on this, using WAW-300 micro-electro-hydraulic servo universal testing machine, acoustic emission and ultrasonic monitoring system, three different sizes of square samples with side length of 50, 70 and 100 mm were selected for uniaxial compression test. The variation rules of acoustic emission parameters and ultrasonic velocity were used to investigate the damage evolution law of cemented backfills with different sizes. The research results show that: (1) With the increase of size, the uniaxial compressive strength of cemented backfill shows a trend of increasing first and then decreasing, and the failure form changes from mainly splitting failure to shear failure. (2) The variation rules of acoustic emission parameters and ultrasonic velocity show obviously multistage and volatility: with the increase of size, the accumulative counting curve of acoustic emission ringing tends to be gentle during the quiet period, but the increase rate is higher during the active period;and the ultrasonic wave velocity increases during the quiet period and the active period. (3) The dissipated energy in the damage evolution of cemented backfill is the internal factor which affects its compressive strength, when the damage degree in the post-peak failure process is the main reason which affects its failure form. The research results can provide guidance for the prediction of fractures of different sizes of cemented backfill. © 2019, Science Press. All right reserved.
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页码：3053 / 3060
页数：7
相关论文
共 20 条
  • [1] Li M., Mao X.B., Lu A.H., Et al., Effect of specimen size on energy dissipation characteristics of red sandstone under high strain rate, International Journal of Mining Science and Technology, 24, 2, pp. 151-156, (2014)
  • [2] Gonzatti C., Zorzi L., Agostini I.M., Et al., In situ strength of coal bed based on the size effect study on the uniaxial compressive strength, International Journal of Mining Science and Technology, 24, 6, pp. 747-754, (2014)
  • [3] Liang C., Li X., Wu S., Et al., Research on energy characteristics of size effect of granite under low/intermediate strain rates, Rock and Soil Mechanics, 37, 12, pp. 3472-3480, (2016)
  • [4] Wang Q., Zhu W., Liu H., Et al., Size effect of long-term strength of sandstone under uniaxial compression, Rock and Soil Mechanics, 37, 4, pp. 981-990, (2016)
  • [5] Meng Q., Han L., Pu H., Et al., Effect of the size and strain rate on the mechanical behavior of rock spicemens, Journal of China University of Mining and Technology, 45, 2, pp. 233-243, (2016)
  • [6] Ye G., Xie L., Guo L., Et al., Study on the strength of packing specimens in different shape or size, China Mining Magazine, 24, 10, pp. 128-131, (2015)
  • [7] Gan D., Han L., Liu Z., Et al., Experimental study on the size effect of compressive strength of cemented filling body, Metal Mine, 1, pp. 32-36, (2018)
  • [8] Peng Z., Size effect of compressive strength of cemented backfill, China Mining Magazine, 18, 7, pp. 88-90, (2009)
  • [9] Xu M., Jin A., Guo L., Et al., Sample size effect on strength of full tailings cemented backfill, China Mining Magazine, 25, 5, pp. 87-92, (2016)
  • [10] Wang Z., Li Z., Gu N., Et al., Study on the acoustic emission and fracture characteristics of the backfill, Metal Mine, 8, pp. 51-57, (2018)
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