Investigation on crack recovery effect of coal-rock combined body under the influence of unloading

被引：0
|
作者：
Zuo J. [1 ,2 ,3 ]
Chen Y. [1 ,2 ]
机构：
[1] School of Mechanics & Civil Engineering, China University of Mining and Technology(Beijing), Beijing
[2] Henan Key Laboratory for Green and Efficient Mining & Comprehensive Utilization of Mineral Resources, Henan Polytechnic University, Jiaozuo
[3] State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology(Beijing), Beijing
来源：
| 2017年 / China Coal Society卷 / 42期
关键词：
Coal-rock combined body; Crack recovery; Nonlinear model; Unloading;
D O I：
10.13225/j.cnki.jccs.2017.0682
中图分类号：
学科分类号：
摘要：
The test machine MTS 815 was applied to carry out cyclic loading-unloading experiments for coal-rock combined body. The axial crack recovery effect was analyzed and the axial crack closure stress (strain) and recovery stress (strain) were obtained. The results show that the axial crack closure stress (strain) and axial crack closure recovery stress (strain) increase with increasing cyclic times. Due to the increase of stress level, new cracks are generated, and the axial crack closure strain difference, axial crack recovery strain difference and axial crack stress difference increase with increasing cyclic times. Based on natural strain and engineering strain, the axial crack recovery model is proposed and verified by experimental data. The good agreement between theoretical data and test data shows the model is reasonable. Also, the proposed model can describe the axial crack recovery effect during unloading process well. © 2017, Editorial Office of Journal of China Coal Society. All right reserved.
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页码：3142 / 3148
页数：6
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