Criterion of local energy release rate of gob instability in deep mines considering unloading stress path

Fu Jianxin; Song Weidong; Tan Yuye

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Criterion of local energy release rate of gob instability in deep mines considering unloading stress path

机译：考虑卸荷应力路径的深矿采空区失稳局部能量释放率判据

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摘要

The stress path characteristics of surrounding rock in the formation of gob were analyzed and the unloading was solved. Taking Chengchao Iron Mine as the engineering background, the model for analyzing the instability of deep gob was established based on the mechanism of stress relief in deep mining. The energy evolution law was analyzed by introducing the local energy release rate index (LERR), and the energy criterion of the instability of surrounding rock was established based on the cusp catastrophe theory. The results show that the evolution equation of the local energy release of the surrounding rock is a quartic function with one unknown and the release rate increases gradually during the mining process. The calculation results show that the gob is stable. The LERR per unit volume of the bottom structure is relatively smaller which means that the stability is better. The LERR distribution showed that there was main energy release in the horizontal direction and energy concentration in the vertical direction which meets the characteristics of deep mining. In summary, this model could effectively calculate the stability of surrounding rock in the formation of gob. The LERR could reflect the dynamic process of energy release, transfer and dissipation and that provided an important reference for the study of the stability of deep mined out area.

机译：分析了采空区形成过程中围岩的应力路径特征，解决了卸荷问题。以成潮铁矿为工程背景，根据深部开采的应力释放机理，建立了深部采空区失稳分析模型。通过引入局部能量释放速率指数（LERR），分析了能量演化规律，并根据尖峰突变理论建立了围岩失稳的能量判据。结果表明，围岩局部能量释放的演化方程是一个未知的四次函数，在开采过程中释放速率逐渐增大。计算结果表明该料滴是稳定的。底部结构的每单位体积的LERR相对较小，这意味着稳定性更好。 LERR分布表明，水平方向主要能量释放，垂直方向主要能量集中，符合深部开采的特征。综上所述，该模型可以有效地计算出采空区形成过程中围岩的稳定性。 LERR可以反映能量释放，传递和耗散的动态过程，为研究深部采空区的稳定性提供重要参考。

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来源
《矿业科学技术学报：英文版》 |2017年第006期|P.1011-1017|共7页
作者
Fu Jianxin; Song Weidong; Tan Yuye;
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作者单位

[1]Civil and Resources Engineering School, University of Science and Technology Beijing, Beijing 100083, China;

[2]State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China;

[1]Civil and Resources Engineering School, University of Science and Technology Beijing, Beijing 100083, China;

[2]State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China;

[1]Civil and Resources Engineering School, University of Science and Technology Beijing, Beijing 100083, China;

[2]State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China;

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收录信息中国科学引文数据库(CSCD);
原文格式 PDF
正文语种 CHI
中图分类矿业工程;
关键词
Deep mine; Gob; Unloading; Local energy release rate; Cusp catastrophe;

机译：深井;采空区;卸荷;局部能量释放率;尖锐突变;

Criterion of local energy release rate of gob instability in deep mines considering unloading stress path

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