Experimental study of ore-rock splitting failure characteristics at different loading rates

被引：0

作者：

Jin A. ^{[1
,2
]}

Zhu D. ^{[1
,2
]}

Sun H. ^{[1
,2
]}

Chen S. ^{[1
,2
]}

Yao B. ^{[1
,2
]}

机构：

[1] Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science and Technology Beijing, Beijing

[2] School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 01期

基金：

中国博士后科学基金; 中央高校基本科研业务费专项资金资助; 中国国家自然科学基金;

关键词：

digital image correlation(DIC) technology; energy evolution; loading rate; microscopic fracture; ore-rock; tensile strength;

D O I：

10.11817/j.issn.1672-7207.2023.01.025

中图分类号：

学科分类号：

摘要：

In order to study the influence of different loading rates on the splitting failure characteristics of ore-rock, Brazilian splitting tests of ore-rock were conducted based on digital imagine correlation. The splitting failure characteristics of iron ore and surrounding rock at different loading rates were analyzed from the aspects of tensile strength, different energy evolutions and horizontal strain distributions. The results are as follows. 1) The tensile strength of ore-rock increases with the increase of loading rate. Among them, the tensile strength of the surrounding rock increases linearly with the loading rate, the tensile strength of iron ore increases sharply and then slowly with the increase of the loading rate, and there is a power function relationship between tensile strength and loading rate. 2) The total energy and elastic strain energy inside the ore-rock both increase with the increase of the loading rate, while the dissipation energy shows a downward trend. After the loading rate increases, the iron ore will store 25.78% more elastic energy than the surrounding rock, and the risk of rock burst is high. Reasonably slowing down the mining progress can ensure the safety of mineral mining. 3) The horizontal strain evolution of iron ore and surrounding rock varies with the loading rate similarly, i.e., the iron ore and surrounding rock strain zones with a loading rate of 0.02 kN/s extend from the middle to both ends, and the iron ore and surrounding rock strain zones with a high loading rate extend from both ends to the central part of the disc converges. 4) Different loading rates has different effects on ore-rock failure. When the loading rate is low(0.02 kN/s), the horizontal strain on the surface of the ore-rock shows a normal distribution, and the horizontal strain at the end of the ore rock is prominent after the loading rate is increased. The end strain concentration tendency of iron ore caused by the change of loading rate is earlier than that of the surrounding rock. © 2023 Central South University of Technology. All rights reserved.

引用

页码：269 / 279

页数：10

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