scholarly journals Study and evaluation of the stability of underground mining method used in shallow-dip vein deposits hosted in poor quality rock

2021 ◽  
Vol 15 (3) ◽  
pp. 31-38
Author(s):  
Omar Ghazdali ◽  
Jalal Moustadraf ◽  
Tarik Tagma ◽  
Bahija Alabjah ◽  
Fouad Amraoui
Keyword(s):  
Underground Mining ◽  
Mining Industry ◽  
Poor Quality ◽  
Mining Method ◽  
Rock Support ◽  
Total Displacement ◽  
Vein Deposits ◽  
Mining Design ◽  
The Stability ◽  
Q System

Purpose.This article proposes to analyze and determine the mining design for shallow-dip deposits hosted in poor quality rock. Methods. We used the UBC tool to find the optimal exploitation method, the Rock mass rating (RMR) and Q-system (Q) to determine the optimal mining stope and the recommended rock support, the numerical modeling by RS2 software with a variety of geotechnical, geometrical, and technical conditions to analyze the evolution of the unstable zone width and the maximum total displacement around the stope after excavation. Findings. The optimum mining method designated by the UBC tool for this type of deposit is the cut and fill. By projecting the obtained RMR and Q-system values on the design graph, it is concluded that the operating stope is located in the stable zone with a height of 3 m, and bolting support is recommended. The simulation by RS2 software reveals that the optimal mining design that can be used to mine shallow-dip vein deposits hosted in poor quality rocks consists of a 3 m high stope and a 75° dip with cemented backfill. Originality.This work presents a study to choose the most suitable underground mining method and mine design for shallow-dip deposits hosted in poor quality rock. Practical implications.In the mining industry, the success of operating an underground mine is conditioned by the selection of the appropriate method, of the mining design and dimensioning of a rock support adapted to the nature of the rock, and excavation geometry according to the type and nature of the deposit.

scholarly journals Peningkatan Kestabilan Pilar Tambang Bawah Tanah Marmer di PT Gunung Marmer Raya

2020 ◽  
Vol 3 (1) ◽  
pp. 27-38
Author(s):  
Purwanto Purwanto
Keyword(s):  
Rock Mass ◽  
Safety Factor ◽  
Underground Mining ◽  
Underground Mine ◽  
Joint Movement ◽  
Pillar Stability ◽  
The North ◽  
Joint Monitoring ◽  
The Stability ◽  
Q System

PT Gunung Marmer Raya  (PT GMR), a room and pillar underground marble mining is located about  73 km to the north from Makassar, in Desa Tabo-Tabo, Kecamatan Bungoro, Kabupaten Pangkep. In the mining location, discontinuities are found as joint structure across the production area. The purpose of this service is to make pillar redesign that can improve the stability of underground mine. These activities start with field observation, determining the rock characteristic through sample testing in the laboratory, classifying the rock mass using Q-system method, up to redesigning a form of implementation to increase the stability of the marble underground mine. According to calculation of rock mass classification using Q-System, the recommended buffering is systematic bolting and fiber reinforced sprayed concrete as thick as 5-6 cm with spacing between bolts of 2.2 meters, or systematic bolting without concrete layering with spacing between-bolt 1.8 meter. Joint monitoring, especially on pillars, need to be done routinely so joint movement could be anticipated for progressive movement. The existing dimensions of pillar 5 m x 5 m in length and width is not recommended due to the safety factor is under 1,0  (unstable condition). Based on observation and analytic calculation, for each pillar height of up to 11 meters the pillar is recommended to redesign with length and width 5 m x 9 m for the chain pillar (safety factor around 1.35-1.49); and 5 m x 12 m for barrier pillars (safety factor around 1.58-1.74). Key Words: Underground mining; room and pillar method; Q-system classification system; pillar stability; marble mining.

scholarly journals Analysis of combined open-pit and underground mining method for Кuzbass coal deposits

2021 ◽  
Vol 330 ◽  
pp. 01006
Author(s):  
Valeriy Fedorin ◽  
Vyatcheslav Shakhmatov ◽  
Gleb Opruk ◽  
Yelena Kuznetsova
Keyword(s):  
Coal Mining ◽  
Underground Mining ◽  
Mining Industry ◽  
Open Pit ◽  
Mining Method ◽  
Coal Mining Industry ◽  
Advanced Technologies ◽  
Modern Development ◽  
Coal Deposits ◽  
Mining Methods

Modern development of coal mining industry in Kuzbass is carried out using advanced mining techniques. Analysis of its geological and technological conditions is performed with respect to the development of advanced technologies in related coal mining methods, developing combined (open-pit and underground) geotechnologies for complex mining of coal deposits.

scholarly journals Rock stability analysis – A case study

2018 ◽  
Vol 149 ◽  
pp. 02072 ◽  
Author(s):  
A. Lahmili ◽  
L. Ouadif ◽  
A. Akhssas ◽  
L. Bahi
Keyword(s):  
Analytical Study ◽  
Poor Quality ◽  
Empirical Methods ◽  
Rock Stability ◽  
Classical Studies ◽  
Risk Of Fall ◽  
The Stability ◽  
Bearing Structure ◽  
Q System

The problems of the stability of the mineral-bearing structure ST2 at 560 m of depth in the east zone of Bou-azzer mine disturbs the advance of the exploitation. The geological and structural study based on field observations and the analysis of core drilling shows the presence of altered and fractured diorite surmounted by cobalt mineralization. Based on the empirical methods of Barton (Q-system) and Bieniawski (RMR) the bed rock is classified as poor quality. The analytical study made it possible to dimension supporting by bow-pieces and bolting. The existence of several types of discontinuities (fault, diaclases and joints) has made the realization of numerical simulation by the finite elements method very difficult. These discontinuities create a network of natural fractures which cut out the blocks in various forms likely to be detached or slip into the excavation, thus encouraging the infiltration of water creating pressure on the massif. The classical studies show their limits in practice for installation of supporting because they must take into account the characteristics of discontinuities. Hence a structural analysis of the massif is essential. The cracking survey of ST2 at 560 m of depth in the east zone of Bou-azzer mine at 560m of depth, and their processing by the DIPS software, showed the existence of three main families of discontinuity NW-SE with a dip of 75SW, NS subverticale and NE-SW with a dip of 57NW, and two families of minor joints NW-SE and NE-SW with successive dips of 40SW and 75SE. The analysis of fracturing surveys allowed us to evaluate the risks of falling blocks and the families of discontinuity responsible for them, and to limit the zones presenting a risk of slip and the families responsible for them. The importance of this study is of knowing how and where to put supporting to be opposed to the risk of fall and tilting of the blocks, caused by the network of discontinuities of the massif.

scholarly journals Comparative analysis of the mine pressure at non-pillar longwall mining by roof cutting and traditional longwall mining

2019 ◽  
Vol 16 (2) ◽  
pp. 423-438 ◽  
Author(s):  
Peng Zhou ◽  
Yajun Wang ◽  
Guolong Zhu ◽  
Yubing Gao
Keyword(s):  
Pressure Distribution ◽  
Coal Mining ◽  
Longwall Mining ◽  
Mining Industry ◽  
Mine Pressure ◽  
Mining Method ◽  
Working Face ◽  
Distribution Features ◽  
Mining Pressure ◽  
The Stability

Abstract Non-pillar coal mining has been developed and implemented in the recent decades in China's coal mining industry. The non-pillar longwall mining by roof cutting without pre-excavated entry (N00 mining method) is one of the latest non-pillar mining methods and this method has the advantages of reduced roadway drivage ratio and increased resource recovery ratio. Previous studies show that the mining pressure during the working face advancing is one of the main factors that affect the stability of underground structures and the safety production. However, there is no evaluation or analysis of the mining pressure at the mining face using entry retaining with roof pre-cutting and an absence of pre-excavated tail entry. In this paper, both field monitoring and numerical simulation approaches are employed in the analysis of the mining pressure distribution characteristics within a range of the whole working face during the face advancing. The results are compared with the field data and simulation results from the traditional mining method performed in the same coal mine. Results supported the idea that the N00 mining method can generate a low-stress area for the retained entry. The stability of the working face and retained entry can be well maintained due to the mine pressure optimization. This paper can aid in the understanding of structural mechanic modeling and mine pressure distribution features, structural mechanic analysis and mine pressure distribution features of the N00 mining method.

scholarly journals Benchmarking as a Determinant of Modern Mining Education

2020 ◽  
Vol 174 ◽  
pp. 04053
Author(s):  
Alena Chupryakova ◽  
Lyudmila Zakonnova ◽  
Mariana Petrova
Keyword(s):  
Business Processes ◽  
Underground Mining ◽  
Mining Industry ◽  
Process Approach ◽  
Clear Understanding ◽  
Educational Standards ◽  
Mining Method ◽  
Top Managers ◽  
Coal Enterprises ◽  
Financial Result

This paper discusses the adaptation of mining education to the modern requirements of improving the management of mining enterprises. The authors substantiate the necessity and expediency of including a separate benchmarking course in the programs of university and postgraduate mountain education, which is based on the postulates of the process approach to management. It is necessary to gain understanding and knowledge of all processes occurring in the organization, based on illustrating the flow of processes with drawings, graphs of changes in process parameters; have a clear understanding of the standards in order to use their experience in relation to their activities, as well as managers should have a pronounced desire to improve their activities in order to achieve the maximum financial result. The paper presents the results of a study on testing the mechanism for using benchmarking tools conducted by the authors at mining enterprises of an open and underground mining method. Among the main tasks of top managers to reduce the risks of inadequate business processes in coal enterprises, it is necessary to resort to a criterion-based assessment of business processes through internal process benchmarking and the provision of analytical information to interested parties, which will allow them to identify «narrow» places during the implementation of the process and make informed management decisions. The presented conclusions are recommended for consideration when drawing up educational standards and programs for the training and retraining of managerial personnel for the mining industry.

The Nature of Mining-Induced Horizontal Displacement of Surface on the Example of Several Coal Mines

2014 ◽  
Vol 59 (4) ◽  
pp. 971-986 ◽  
Author(s):  
Krzysztof Tajduś
Keyword(s):  
Underground Mining ◽  
Mining Industry ◽  
Horizontal Displacement ◽  
Surface Slope ◽  
Proportionality Coefficient ◽  
Model Studies ◽  
Displacement Vectors ◽  
Mining Conditions ◽  
Design Projects ◽  
Academy Of Sciences

Abstract The paper presents the analysis of the phenomenon of horizontal displacement of surface induced by underground mining exploitation. In the initial part, the basic theories describing horizontal displacement are discussed, followed by three illustrative examples of underground exploitation in varied mining conditions. It is argued that center of gravity (COG) method presented in the paper, hypothesis of Awierszyn and model studies carried out in Strata Mechanics Research Institute of the Polish Academy of Sciences indicate the proportionality between vectors of horizontal displacement and the vector of surface slope. The differences practically relate to the value of proportionality coefficient B, whose estimated values in currently realized design projects for mining industry range between 0.23r to 0.42r for deep exploitations, whereas in the present article the values of 0.33r and 0.47r were obtained for two instances of shallow exploitation. Furthermore, observations on changes of horizontal displacement vectors with face advancement indicated the possibility of existence of COG zones above the mined-out field, which proved the conclusions of hitherto carried out research studies (Tajduś 2013).

scholarly journals Automatic Monitoring System Designed for Controlling the Stability of Underground Excavation

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Piotr MAŁKOWSKI ◽  
Zbigniew NIEDBALSKI ◽  
Łukasz BEDNAREK
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Automatic Monitoring ◽  
Mass Movements ◽  
Support Design ◽  
Automatic Monitoring System ◽  
Underground Workings ◽  
The Stability ◽  
Technical Solutions ◽  
The Given

Ensuring the stability of mining excavations is a crucial aspect of underground mining. For thispurpose, appropriate shapes, dimensions, and support of workings are designed for the given mining andgeological conditions. However, for the proper assessment of the adequacy of the used technical solutions,and the calibration of the models used in the support design, it is necessary to monitor the behavior of theexcavation. It should apply to the rock mass and the support. The paper presents the automatic systemdesigned for underground workings monitoring, and the example of its use in the heading. Electronicdevices that measure the rock mass movements in the roof, the load on the standing support, and on bolts,the stress in the rock mass, are connected to the datalogger and can collect data for a long of time withoutany maintenance, also in hard-to-reach places. This feature enables the system to be widely used, inparticular, in excavations in the vicinity of exploitation, goafs, or in the area of a liquidated exploitationfield.

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