scholarly journals Improving the Stability of the Directional Room G 31-33, Horizon 210 - East, Ocnele Mari-Coceneṣti Salt Mine, By Reinforcement with Anchors and Shotcrete

Mining Revue ◽  
2021 ◽  
Vol 27 (4) ◽  
pp. 19-27
Author(s):  
Dacian-Paul Marian ◽  
Ilie Onica
Keyword(s):  
Finite Element ◽  
Numerical Modelling ◽  
Rock Salt ◽  
Systematic Measurement ◽  
Salt Mine ◽  
Salt Deposit ◽  
3D Finite Element ◽  
G 31 ◽  
The Stability ◽  
Horizontal Displacements

Abstract The rock salt deposit from Ocnele Mari - Coceneşti was mined by the method with rooms and small square pillars, at the levels + 226m and + 210m. Although the saline is not deep, certain instability phenomena (cracks, exfoliations) have occurred in the resistance structures (pillars, ceilings), especially in the G31-33 directional room, horizon 210E. These instability phenomena were also highlighted following the 3D finite element numerical modelling. In order to prevent the degradation of the mining excavations and the resistance structures, the affected surfaces were supported with anchors and reinforced shotcrete. The ceiling of the consolidated section of the G31-33 directional room, horizon 210E is monitored by the systematic measurement, on topographic landmarks mounted on the ceiling, of the vertical and horizontal displacements.

Study on the Temperature Field of Cemented Carbide Substrate in Miniature EACVD System

2008 ◽  
Vol 375-376 ◽  
pp. 525-529
Author(s):  
Hong Xiang Wang ◽  
Dun Wen Zuo ◽  
Wen Zhuang Lu ◽  
Feng Xu ◽  
Dang Zeng ◽  
...  
Keyword(s):  
Growth Rate ◽  
Finite Element ◽  
Temperature Field ◽  
Substrate Temperature ◽  
Diamond Films ◽  
Element Model ◽  
Cemented Carbide ◽  
Fe Model ◽  
3D Finite Element ◽  
The Stability

The uniform distribution and the stability of the substrate temperature are the most important factors that deeply affect the quality and the growth rate of diamond films. In this paper, cemented carbide cutters were chosen for substrates, the 3D finite element (FE) model of filaments and substrates was developed in ANSYS 8.0, the calculated results show that the substrate temperature is influenced by the filament temperature, filaments diameter, the quantity of the filaments and the distance between the filaments and the substrates. The 3D finite element model of filaments and substrates also provides a basis for selecting the parameters to obtain uniform diamond films in miniature EACVD system.

scholarly journals Labile technogenic geological system of the flooded Shevchenko salt mine (Ukraine)

2018 ◽  
Vol 27 (2) ◽  
pp. 184-201
Author(s):  
L. Bosevska ◽  
Anirban Chowdhury
Keyword(s):  
Rock Salt ◽  
Salt Mine ◽  
Salt Deposit ◽  
Mine Area ◽  
Deformation Control ◽  
Deformation Processes ◽  
Analytical Processing ◽  
Destructive Processes ◽  
Salt Mining

This paper presents the analog ecological-mining-geological model of the labile technogenic geological system created at the Shevchenko flooded salt mine area within Artyomovsk rock salt deposit, which is the largest rock salt deposit in Europe. Description of all the system elements taking into account their interconnection and interaction are presented on the basis of the analytical processing and compilation of basic mining and geological data as well as the results of the long-term complex ecological-mining-geological monitoring.The paper describes both the geology of the mine area and the condition assessment of the mine including its shape, parameters, and layout. In addition, scientific interpretation of the mechanism of multi-act intrasystem destructive processes, which have been taking place in the last few decades are provided. Natural and technogenic factors determining the development of the created technogenic geological system (such as man-made karst and critical geomechanical deformations) are summarized and analysed. Predictive evaluation of the time-dependent deformation processes development has been carried out using theexisting methodology for assessing the geomechanical condition of the mined-out area of the salt massive. Correctness of the method for evaluation of stability of the unsupported workings system currently in use for the Artyomovsk rock salt deposit development has been confirmed. This work concerns the scientific problems of maintenance of the geo-ecological safety in the densely populated areas disturbed by underground salt mining. Hereinabove research results add information and analytical base to improve the deformation control system for ductile salt layers in various dynamic conditions of man-caused and natural loads. It is shown that such control is required for the aim of reduction of environmental risks and ensuring the safe operation of salt deposits, salt resources protection as well as infrastructure objects at the Earth’s surface nearby sites of modern salt mining activity.

scholarly journals Finite element modeling of the stability of rooms and resistance structures from the Cantacuzino Mine

2021 ◽  
Vol 342 ◽  
pp. 02004
Author(s):  
Dacian-Paul Marian ◽  
Ilie Onica
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Stress And Strain ◽  
Element Analysis ◽  
3D Finite Element ◽  
State Of Stress ◽  
Mining Conditions ◽  
Elasto Plasticity ◽  
The Stability

The Cantacuzino Mine was mined with small rooms and square pillars, on seven levels, over a period of 27 years, extracting over 2.3 million m3 of rock salt. Due to the specific geo-mining conditions, the support structures suffered different degrees of deformation, especially the cracking of the ceilings between the first 5 levels. This article presents a 3D finite element analysis, in elasto-plasticity, of the state of stress and strain that generated the deformation of the pillars and ceilings between levels.

scholarly journals Finite Element Modelling of the Stability of Underground Mining Excavations at Old Mines – Slănic Salt Mine

Mining Revue ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 12-23
Author(s):  
Dacian-Paul Marian ◽  
Ilie Onica
Keyword(s):  
Finite Element Modelling ◽  
Underground Mining ◽  
Stress And Strain ◽  
Salt Mine ◽  
Salt Deposit ◽  
Element Modelling ◽  
State Of Stress ◽  
Elasto Plasticity ◽  
The Stability ◽  
Over Time

Abstract The underground mining of the rock salt deposit from Slănic started over 350 years ago, in bell-shape room (Ocna din Deal and Ocna din Vale) and in large trapezoidal rooms (Carol, Mihai and Unirea mines), until 1970, generating a volume of underground excavations of over 5.3 million m3. Over time, these large excavations have lost their stability (collapse of the mines to the surface and various degrees of instability of the Carol and Mihai mines), keeping only the Unirea mine in operation for tourist purposes. This article is a synthesis of the analysis with 3D finite elements, in elasto-plasticity, of the state of stress and strain developed around the excavations and highlighting the factors that led to the loss of their stability, focusing on the Unirea mine.

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