Research on mechanical properties and damage law of tantalum-niobium ore cemented tailings backfill

被引：0

作者：

Zhao K. ^{[1
,2
,3
,4
]}

Zhu S. ^{[1
]}

Zhou K. ^{[2
]}

Yan Y. ^{[1
]}

Zhao K. ^{[1
,2
,3
,4
]}

Li Q. ^{[1
]}

Gu S. ^{[1
]}

机构：

[1] School of Architectural and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, Jiangxi

[2] School of Resources and Safety Engineering, Central South University, Changsha, 410083, Hunan

[3] Jiangxi Provincial Key Laboratory of Geotechnical Engineering and Environmental Disaster Control, Ganzhou, 341000, Jiangxi

[4] Ganzhou Nonferrous Metallurgy Research Institute, Ganzhou, 341000, Jiangxi

来源：

Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2019年 / 36卷 / 02期

关键词：

Constitutive model; Damage mechanics; Failure mechanism; Tailings backfill; Tantalum-niobium ore; Tension and compression test;

D O I：

10.13545/j.cnki.jmse.2019.02.026

中图分类号：

学科分类号：

摘要：

In order to study the physical and mechanical properties and damage rules of cemented tailings backfill with tantalum-niobium ore, uniaxial compressive and splitting failure mechanical tests were conducted on 3 sets of cemented tailings specimens with different tailings concentration (68%, 72%, 76%) in the RMT-150C rock mechanics test system. The various mechanical parameters and the stress-strain relationship curves of the filled specimens have been obtained. The damage mechanism of the test specimens in the whole test process has been analyzed in detail. The damage constitutive equations and damage evolution equations of three different concentrations of backfill specimens have been deduced and established. The test results have shown that the greater the concentration of backfill, the higher the tensile and compressive strength and elastic modulus, and the Poisson's ratio is smaller; the damage of the specimens with different concentrations at peak stress is different - the greater the concentration, the greater the damage; before peak stress, the damage expansion of backfill is slower and after peak stress, the smaller the concentration, the faster the damage grows. The damage constitutive equation and damage evolution equation of the cemented tailings backfill in uniaxial compression based on the strain equivalent principle can describe the damage evolution characteristics and damage process of the backfill, and the theoretical curve established by the constitutive model agrees well with the curve obtained by experimental fitting. The results have engineering guiding significance for ensuring the safe production in the mined-out area with tantalum-niobium tailings. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.

引用

页码：413 / 419

页数：6

共 15 条

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