Projects / Programmes
Research of interacting petrographical and physically-mechanical properties of the lignite depending on various stress states
| Code |
Science |
Field |
Subfield |
| 2.05.00 |
Engineering sciences and technologies |
Mechanics |
|
| Code |
Science |
Field |
| P170 |
Natural sciences and mathematics |
Computer science, numerical analysis, systems, control |
Lignite, rock investigation, geomechanical proceedings, compressive strenght, laboratory and model experiments, mine danger, rock pressure, underground exploitation
Researchers (4)
| no. |
Code |
Name and surname |
Research area |
Role |
Period |
No. of publicationsNo. of publications |
| 1. |
13572 |
PhD Evgen Dervarič |
Mining and geotechnology |
Researcher |
2005 - 2007 |
224 |
| 2. |
14371 |
Franci Lenart |
Mining and geotechnology |
Researcher |
2005 - 2007 |
42 |
| 3. |
19302 |
Bojan Stropnik |
Mining and geotechnology |
Researcher |
2005 - 2007 |
0 |
| 4. |
08359 |
PhD Simon Zavšek |
Geology |
Head |
2005 - 2007 |
216 |
Organisations (1)
| no. |
Code |
Research organisation |
City |
Registration number |
No. of publicationsNo. of publications |
| 1. |
1252 |
The Coal mine Velenje |
Velenje |
5040361 |
352 |
Abstract
Exploitation of the lignite coal seam in the Velenje lignite mine is followed by different dangers since it’s start. Among them outbursts of coal and gas and rock bursts are at the most hazardous.
Outbursts of coal and gas and rock bursts are regarding to the cause ranked into the unified ECE classification, precisely to dynamic phenomena in mining. In general it was determined that all events have some common characteristics such as: common influential parameters, conditions of the existence, signs before occurrence, theoretical origin based on accumulated and released energy, predisposition of the coal for such events.
In general, lignite is heterogeneous and porous material, composed of several base lithotype components. Pores are filled with moisture and gas. In spite of confirmation of the mechanism of the outbursts of coal and gas that was achieved by long standing research work, the role of gas, the process of failure and the property of the coal that cause the brittle failure, still remain unexplained.
Subject of the proposed research is to use the movable cellular automata method for exploration of the structural mechanical properties of lignite under different stress states and in presence of gas. Out of several goals the most important is to complete the knowledge of the mechanism of dangerous geodynamic events and to predict them more reliably in order to increase the protection against such phenomena. Application of the method in geology and mining is novelty, which enables discrete modelling of heterogeneous porous material under different external stresses and to follow the development of cracks and failure of the material. The method was developed in the last decade by the experts of the Institute of Strength Physics and Material Science from Tomsk in Russia. The application and the development were enabled through the scientific collaboration between the Velenje lignite mine, ISPMS and the Faculty for the Natural Sciences and Engineering from Ljubljana.
The research program will be executed by steps. Experimental laboratory part will be followed by the determination of the model input data, modelling, calibration and the research of the mechanical failure, using the mechanical gas model, interpretation of the results and findings and directions for the further work. Selected lignite samples will be prepared regarding to the special procedure that involves determination of the structural changes before, during and after the compressive tests. Modelling of the lignite samples demanded more accurate input data. To calibrate the selected MCA models, formation and development of cracks and failures have to be followed and registered. The modelling is based on two-dimensional system. Modelling research included the selection of the characteristic lignite, composition of the exact model samples and the calibration into the experimental results.
The movable cellular automata method that enables the mechanical investigation of the lignite failure, has been further developed with the incorporation of the classical cellular automata. Progress of symbiotic cellular automata method that enables the investigation of the influence of mine gases can be observed. Regarding the long-standing research work of the outbursts phenomena it is clear that the role of gas is very important.
