scholarly journals Water inrush characteristics and hazard effects during the transition from open-pit to underground mining: a case study

2019 ◽  
Vol 6 (3) ◽  
pp. 181402
Author(s):  
Huijie Zhang ◽  
Bin Zhang ◽  
Nengxiong Xu ◽  
Lei Shi ◽  
Hanxun Wang ◽  
...  
Keyword(s):  
Mine Water ◽  
Underground Mining ◽  
Water Inrush ◽  
Mine Safety ◽  
Liaoning Province ◽  
Open Pit ◽  
Comprehensive Method ◽  
Iron Mine ◽  
Mine Roadway

During the transition from open-pit to underground mining in iron ore mines, water inrush is a prominent problem for mine safety and production. In this paper, a comprehensive method that incorporates hydrochemical analysis and numerical simulation is proposed to analyse the characteristics of water inrush during the transition from open-pit to underground mining. The proposed method revealed the migration law of groundwater and analysed the source of mine water inrush in the Yanqianshan iron mine located in Liaoning province, China. The results show that the excavated mine roadway is the primary factor affecting groundwater migration and that the source of the mine water inrush is the groundwater in the aquifer around the mine roadway. Moreover, based on the results of the study, appropriate methods for prevention and treatment of mine water inrush were proposed. This approach provides a novel idea for the assessment of water inrush hazards and will serve as a valuable reference for analogous engineering cases.

scholarly journals A Model to Predict Crosscut Stress Based on an Improved Extreme Learning Machine Algorithm

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 896 ◽  
Author(s):  
Xiaobo Liu ◽  
Lei Yang ◽  
Xingfan Zhang ◽  
Liancheng Wang
Keyword(s):  
Extreme Learning Machine ◽  
Underground Mining ◽  
Liaoning Province ◽  
Stress Monitoring ◽  
Network Algorithms ◽  
Iron Mine ◽  
Time In Literature ◽  
Learning Machine ◽  
First Time

The analysis of crosscut stability is an indispensable task in underground mining activities. Crosscut instabilities usually cause geological disasters and delay of the project. On site, mining engineers analyze and predict the crosscut condition by monitoring its convergence and stress; however, stress monitoring is time-consuming and expensive. In this study, we propose an improved extreme learning machine (ELM) algorithm to predict crosscut’s stress based on convergence data, for the first time in literature. The performance of the proposed technique is validated using a crosscut response by means of the FLAC3D finite difference program. It is found that the improved ELM algorithm performs higher generalization performance compared to traditional ELM, as it eliminates the random selection for input weights. Furthermore, a crosscut construction project in an underground mine, Yanqianshan iron mine, located in Liaoning Province (China), is selected as the case study. The accuracy and efficiency of the improved ELM algorithm has been demonstrated by comparing predicted stress data to measured data on site. Additionally, a comparison is conducted between the improved ELM algorithm and other commonly used artificial neural network algorithms.

scholarly journals Mining Engineers Training: Case Study Method

2019 ◽  
Vol 105 ◽  
pp. 04033 ◽  
Author(s):  
Svetlana Kolomiets ◽  
Elena Medvedeva ◽  
Alena Perevalova
Keyword(s):  
Case Studies ◽  
Engineering Students ◽  
Underground Mining ◽  
Mineral Resources ◽  
Open Pit ◽  
International Exchange ◽  
Case Study Method ◽  
Positive Effects ◽  
Technological Modernization

Currently, the minerals’ extractive industries are going through a deep technological modernization, with a characteristic expansion of international exchange of knowledge and know-how. The unification of the equipment used in open-pit and underground mining, the global spread of advanced mining technologies increases the importance of the linguistic competencies of mining engineers. At the same time, the specifics of training mining engineers is the uniqueness of situations in the extraction and processing of mineral resources, which actualizes the case study method in the training of mining engineers. The paper provides a description of the term «case study» and its basic characteristics and principles of application. The content is based on the authors’ own experience of mining engineers in case studies while teaching English. Some examples of case studies for mining engineering students studying English are presented. The paper notes the effectiveness of implementing case study method and shows its benefits for introducing in the process of mining engineers training. In addition to listing positive effects of the method for developing skills necessary for competitive specialists such as critical thinking, problem solving, creativity, collaboration, etc., the authors mention possible problems that are likely to occur while using this method as well.

The Prediction of Northern Slope Deformation and Failure Caused by the Transformation of Open-Pit to Underground Mining in the Yanqianshan Iron Mine

2014 ◽  
Vol 580-583 ◽  
pp. 364-370
Author(s):  
An Lin Shao ◽  
Hai Long Feng
Keyword(s):  
Slope Failure ◽  
Underground Mining ◽  
Limit Equilibrium ◽  
Failure Process ◽  
Open Pit ◽  
Northern Slope ◽  
Body Distribution ◽  
Ore Bodies ◽  
Sublevel Caving ◽  
Iron Mine

<span><p class="TTPAbstract"><span lang="EN-US">The Yanqianshan<a name="OLE_LINK94"></a><a name="OLE_LINK93"></a> iron mine is preparing to transform from an open-pit mine to an underground mine. We adopt the <a name="OLE_LINK104"></a><a name="OLE_LINK103"></a>non-pillar sublevel caving approach to exploit the particularly thick steep ore bodies within the range from -183 m to -500 m from top to bottom. According to the features of ore body distribution and the approaches of exploitation, we expect that underground mining will result in <a name="OLE_LINK102"></a><a name="OLE_LINK101"></a>the loss of stability on the northern slope of the open pit, causing traction-type landslides. Moreover, along with increasing the depth of the mining operation, the range of slope failure will continue to expand and further affect the safety of drainage features and roads distributed on the north side of the open pit. For this purpose, we select f</span><span lang="EN-US">our</span><span lang="EN-US"> sections along the trending direction of ore bodies and apply the limit equilibrium method to predict the failure process and characteristics on the northern slope according to the stratified mining process.</span><span lang="EN-US"><o:p></o:p></span></p>

scholarly journals A New Mining Scheme for Hanging-Wall Ore-Body during the Transition from Open Pit to Underground Mining: A Numerical Study

2018 ◽  
Vol 2018 ◽  
pp. 1-17
Author(s):  
Baohui Tan ◽  
Fengyu Ren ◽  
Youjun Ning ◽  
Rongxing He ◽  
Qiang Zhu
Keyword(s):  
Underground Mining ◽  
Numerical Study ◽  
Hanging Wall ◽  
Slope Instability ◽  
Open Pit ◽  
Ore Body ◽  
Instability Development ◽  
Induced Caving ◽  
Iron Mine ◽  
Mining Scheme

A new mining scheme by employing the induced caving mining method to exploit hanging-wall ore-body during the transition from open pit to underground mining is proposed. The basic idea is to use the mined-out area generated by the planned mining of the hanging-wall ore-body to absorb the collapsed slope body, so as to avoid the influence of the inner-slope mining to the normal open-pit mining and guarantee mining efficiency during the transition stage. Numerical simulation study on the process of induced caving mining of hanging-wall ore-body is carried out based on the practical engineering setting of the Hainan iron mine, China, by employing the numerical method of discontinuous deformation analysis (DDA). The impact of rock mass structure on the mechanism of slope instability development and the mining hazard assessment in the new mining scheme is investigated. The influence of mining sequence on slope instability development and mining safety is also analyzed by taking the hanging-wall ore-body mining under the southern anti-dip slope at the Hainan iron mine as an example, and eventually a reliable mining scheme via induced caving is obtained. The numerical study proves the feasibility of the proposed new mining scheme for hanging-wall ore-body and provides theoretical and technical support for its application in practical mining activities.

Prediction of failure of south slope caused by underground mining in the Yanqianshan open-pit iron mine

2013 ◽  
pp. 391-397
Author(s):  
Xuebing Pei ◽  
Renjie Zhou ◽  
Nengxiong Xu ◽  
Xiaoqiang Liu ◽  
Jingping Liu
Keyword(s):  
Underground Mining ◽  
Open Pit ◽  
Iron Mine ◽  
South Slope
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