Macro-Micro Response Characteristics of Surrounding Rock and Overlying Strata towards the Transition from Open-Pit to Underground Mining

Author:

Li Xiaoshuang1234,Yang Shun1ORCID,Wang Yunmin34,Nie Wen1,Liu Zhifang1

Affiliation:

1. School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China

2. School of Civil Engineering, Shaoxing University, Shaoxing Zhejiang 312000, China

3. State Key Laboratory of Safety and Health in Metal Mines, Maanshan, Anhui 243003, China

4. Sinosteel Maanshan General Institute of Mining Research Co. Ltd., Maanshan, Anhui 243000, China

Abstract

The macro-micro mining response of the surrounding rock and overlying strata towards the transformation from open-pit to underground mining is examined in the present study, based on the engineering background of the Jinning phosphate mine (Yunnan Phosphate Chemical Group Co., Ltd.) via simulations involving similar materials, digital photographic measurement technology, and numerical simulation. The mining deformation of the surrounding rock underground, and of the overlying strata, is shown to develop in three stages, namely: (1) small and local deformation, (2) continuous linear increase, and (3) the violent nonlinear collapse of the entire system. The internal distribution of stress in the surrounding rock and adjacent overlying strata of the inclined mined-out area is complicated. The degrees of pressure increase and pressure relief have an important relationship with the size of the mining space. The pressure relief is more complete close to the mined area, and the stress reduction decreases with increasing distance. The cracks propagate in arc shapes and have a tendency to penetrate into the upper and lower ends of the stope. The size of the excavation space plays a key role in the generation, propagation, and penetration of the cracks. Due to the disturbance of the first mining level and the increase in excavation depth, the rate of damage to the surrounding and overlying rock increases in the second mining level. This process generates more cracks, which accelerate the instability of the surrounding rock and overlying strata.

Funder

China Postdoctoral Science Foundation

Publisher

Hindawi Limited

Subject

General Earth and Planetary Sciences

Reference70 articles.

1. Engineering geology: review and prospect of past ten years in China;R. Q. Huang;Journal of Engineering Geology,2017

2. The implication and evaluation of toppling failure in engineering geology practice;R. Q. Huang;Journal of Engineering Geology,2017

3. Transition from open-pit to underground in the case of Chah-Gaz iron ore combined mining

4. Model tests for mechanical respond of bedding rock during different excavation and anchoring process;C. Li;Chinese Journal of Underground Space and Engineering,2017

5. Research progress on the key problems in transition from open-pit to underground mining for metal mines;X. S. Li;Metal Mine,2019

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3