ACARP ACARP ACARP ACARP
Underground

Automatic Real Time Assessment of Windblast Risk

Underground » Strata Control and Windblasts

Published: June 02Project Number: C8026

Get ReportAuthor: Van Zyl Brink, AR Newland | Snowden Associates

The main objective of this project was to automatically assess the risk of experiencing a windblast in a longwall operation. The logical extension of the risk assessment was the automatic generation of an alarm should the risk exceed pre-determined levels.

Certain conditions need to be present to experience windblasts of an intensity that threatens the safety of the underground operator. These conditions include the geological configuration and the dimensions of the mining excavation (mine layout). Mine planning and operation constraints provide limited flexibility in preventing or controlling the occurrence of large goafs and subsequent windblasts.

Windblast early warning is being achieved at Moonee Colliery. The early warning system has proved to be an effective operational tool. This project endeavoured to provide the methodology to automatically generate windblast early warning alarms. The windblast problem at Moonee, the management and effectiveness of the seismic system and the recorded data were used as the basis for developing and evaluating the automatic early warning methodology.

The report describes the installation of the seismic system and the operator-based real time application of the ISS-stability concept. This concept was first coded into a threshold-based decision tree in an attempt to duplicate the decisions made by the on-site operator. Individual early warning parameters were tested. These parameters were: the precursive event rate; changes in the volume of coseismic inelastic strain (Apparent Volume); and the comparison of radiated energies of seismic events of similar moments. It was found that the precursive event rate was the most reliable parameter.

In order to show clearly that the seismic response to mining, as reflected by these seismic parameters, exhibits an early warning to a pending large instability in the roof, a probabilistic risk-assessment approach was developed and tested. An off-the-shelf expert system was used as the basis for applying a probabilistic philosophy in risk assessment. The result was an early warning system more effective than the threshold-based decision tree concept and as effective as the full-time operator.

The report also describes the attempt to normalise the seismic parameters to the production in a way other than through a temporal reference. The use of the automatic risk assessment in parallel with control measures, such as the hydrofracturing initiation of goafing, is also described.

The report concludes with recommendations on further development, testing and implementation of the expert system philosophy in automatic assessment and recognition of windblast risk.

The CD also contains the software developed at Moonee to undertake the automatic event forecasting function.

Underground

Health and safety, productivity and environment initiatives.

Recently Completed Projects

C5017Ground Behaviour About Longwall Faces And Its Effect On Mining

Longwall geomechanical research being ...

C20006Development Of An Alternative Electronic Spark Test Apparatus

In this phase of the project, CRCMining has further developed and demons...

C22003Investigation Of The Potential Lightning Impacts On Underground Coal Mines

The objective of this research was to develop and apply computer models ...

Underground

Open Cut

Safety, productivity and the right to operate are priorities for open cut mine research.

Recently Completed Projects

C23007Selection And Optimisation Of Risk Controls

The Australian coal mining industry recognises it is important to have e...

C21036Understanding The Physical And Detonation Characteristics Of Bulk Explosives To Minimise Post Blast Fume Generation In Deep Hole, Soft Ground And Wet Conditions

Post blast fume has a pungent, acrid odour, features strong colours rang...

C19029Soil Organic Matter And Green Carbon In Rehabilitation:Their Role In The Carbon Balance

Quantifying carbon fluxes in reclaimed mining environments can define th...

Open Cut

Coal Preparation

Maximising throughput and yield while minimising costs and emissions.

Recently Completed Projects

C23043Product Coal Loss Due To Inappropriate Focus On Ep

The Coal Preparation fraternity is used to focussing on Ep(75/25) va...

C20047Improved Dewatering, Management And Rehabilitation Of Problematic, Clay-Rich Coal Mine Tailings

The aim of this project was to test a broad range of samples of clay min...

C23034Comparison Of Column And Mechanical Flotation Technologies

Fine coal beneficiation is virtually essential for coking coals unle...

Coal Preparation

Technical Market Support

Market acceptance and emphasising the advantages of Australian coals.

Recently Completed Projects

C23055Phosphorus In Coal: Status Of Test Methods In Use And Applicability To Industry Needs

The specific objective of this study was to assess whether laboratory te...

C22039Implications Of Coking Conditions On CSR

Coking is one of the main contributors to the quality of the resultant c...

C22035Quality Of Stamp Charged Cokes And Stampability Of Coals At Small Scale

The stamp charging of coal has emerged as a widely-used, effective treat...

Technical Market Support

Mine Site Greenhouse Mitigation

Mitigating greenhouse gas emissions from the production of coal.

Recently Completed Projects

C21061The Role Of Hydrogeology, In Situ Stress And Temperature Logs In The Distribution And Delineation Of Coal Seam Gas Regimes

This thesis explores mechanisms that determine coal seam gas (CSG) distr...

C23052Novel Stone Dust Looping Process For Ventilation Air Methane Abatement - Phase I

The Phase I of the project was conducted over the period between 1 J...

C22041Development Of New Generation Carbon Composites For VAM Capture

Capturing ventilation air methane (VAM) as a way of fugitive methane mit...

Mine Site Greenhouse Mitigation

Low Emission Coal Use

Step-change technologies aimed at reducing greenhouse gas emissions.

Recently Completed Projects

C17060BGasification Of Australian Coals

Four Australian coals were trialled in the Siemens 5 MWth pilot scale ga...

C17060AOxyfuel Technology For Carbon Capture And Storage Critical Clean Coal Technology - Interim Support

The status of oxy-fuel technology for first-generation plant is indicate...

C18007Review Of Underground Coal Gasification

This report consists of a broad review of underground coal gasification,...

Low Emission Coal Use

Mining And The Community

The relationship between mines and the local community.

Recently Completed Projects

C22029Understanding And Managing Cumulative Impacts Of Coal Mining And Other Land Uses In Regions With Diversified Economies

The coal industry operates in the context of competing land-uses that sh...

C23016Approval And Planning Assessment Of Black Coal Mines In NSW And Qld: A Review Of Economic Assessment Techniques

This reports on issues surrounding economic assessment and analysis ...

C19025Governance Strategies To Manage And Monitor Cumulative Impacts At The Local And Regional Level

ACARP levy contributors should order this report in the normal manner – ...

Mining And The Community

NERDDC

National Energy Research,Development & Demonstration Council (NERDDC) reports - pre 1992.

Recently Completed Projects

1609-C1609Self Heating of Spoil Piles from Open Cut Coal Mines

Self Heating of Spoil Piles from Open Cut Coal Mines

1301-C1301Stress Control Methods for Optimised Development...

Stress Control Methods for Optimised Development and Extraction Operations

0033-C1356Commissioned Report: Australian Thermal Coals...

Commissioned Report: Australian Thermal Coals - An Industry Handbook

NERDDC