胶结充填体损伤演化尺寸效应研究

doi:10.13722/j.cnki.jrme.2018.1413

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Abstract 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.

Key words： rock mechanics cemented backfill size effect mechanical properties acoustic emission ultrasonic

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	Articles by authors
	CHENG Aiping1
	2
	3
	DAI Shunyi1
	2
	ZHANG Yushan1
	2
	HUANG Shibing1
	2
	YE Zuyang1
	2

Cite this article:

CHENG Aiping1,2,3, et al. Study on size effect of damage evolution of cemented backfill[J]. , 2019, 38(S1): 3053-3060.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1413 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/3053

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