optimisation of depth of opencast coal mine using udec software
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This document discusses optimizing the depth of open-cast coal mines using UDEC software. It notes that open-cast mines are increasingly reaching deeper depths, making slope stability analysis more important. The objective is to design stable slopes for deeper open-cast coal mines using UDEC software. This will help reduce slope failures, optimize equipment usage, and allow for extracting more coal. The analysis in UDEC involves building, solving, and plotting models. Common problems in deep open-cast mines include unstable benches, transportation challenges, ventilation issues, drainage problems, impacts on local water, and difficult backfilling. Various failure analysis methods and ways to reduce failure risks are also outlined.
optimisation of depth of opencast coal mine using udec software
- 1. OPTIMISATION OF DEPTH OF O/C COAL MINE USING UDEC SOFTWARE PROF. IN-CHARGE Dr. S. S. Gupte
- 2. • In India, the number of operating opencast mines is steadily increasing as compared to underground mines. It is due to low gestation period, higher productivity, and quick rate of Investment.Large number of opencast mines are now days reaching to deeper mining depths. As a result analysis of stability of operating slopes and ultimate pit slope design are becoming a major concern. INTRODUCTION
- 3. OBJECTIVE • Designs of stable slopes for opencast COAL MINES using UDEC SOFTWARE at greater depth • Understanding different types and modes of slope failures with increasing depth IMPORTANCE OF PROJECT • Reduced chances of slope failure • Better utilisation of machinery and equipment • Increased monitoring of sides and slope • We can extract more ore from mine using this method(as we go deeper) i.e. optimisation of depth
- 4. Analysis procedure using UDEC SOFTWARE Divided into 4 stages MODELS STAGE BUILD STAGE SOLVE STAGE PLOT STAGE Accidents in o/c coal mine (unstable slope) Mine Name No of people died year Kawadi o/c mine 10 2000 Mahakali mine 8 1923 Dhori mine 7 1923 Mithapur mine 4 1950 Jamuna mine 6 1963 Jayant o/c project 5 2008
- 5. BUILT STAGE
- 6. SOLVE STAGE
- 7. PLOT STAGE
- 8. Problems and constraints in deep open cast mines. 1. Stability of Benches • As depth increases stress levels increases in slopes and it is obvious that chances of failure will be greater. • This will be enhanced due to weight of the upper benches and movement of heavy machinery as well. 2. Transportation • The standard sized dumpers and machinery may have to be replaced with heavy duty versions. • Bigger size machinery needs larger width of of haul roads.
- 9. (3) Ventilation • Natural ventilation in deep mines is of great concern as deep mines will have have inadequate fresh air at the pit bottom. • Exhaust from machinery and dust clouds in mines adds to the worsening of the situation (4) Drainage • As mines go deeper and deeper, problem of water accumulation also rises. • Also if the mine intersects any aquifier while excavation, may lead to flooding of the mine
- 10. (5) BLASTING • To have stable slopes, having large no. of small benches may be a good option. • For creation of these benches frequent blasting is required. • Due to this transportation cost and workload increases (6). Backfilling at lower levels • Backfilling at deeper depths along with high dip angle of the ore body is difficult. • When the dip is high, less effective space is available for accomodation of the over burden
- 11. (7) Impact on water regime • Deep surface mines affects the hydrological regime and quality of the surrounding water. • Lot of water is used in mining activities. • Water collected in the sump is partly used and discharged on the surface. • This leads to pollution of water on surface.
- 12. Failure analysis method • Stereographic Solution • Toppling Failure Analysis • Circular Failure Analysis • Limit Equilibrium Method • Stress Analysis Method
- 13. WAYS TO REDUCE THE CHANCES OF SURFACE GROUND CONTROL FAILURE • Safe geotechnical design • Provide secondary support • Monitoring devices for advance warning of impending failure
- 14. JAI JAIN AMEYA TELANG B. VENKETESH PRASAD Thank you