Crushing & Grinding Machines

Longwall Top Coal Caving at the Broadmeadow Mine

May 14 2019 0183 32 The adjacent open-cut mine has been mining the full seam section for more than 30 years investigations and evaluations were made into the Top Coal Caving method and its suitability for the operation Longwall Top Coal Caving LTCC was introduced in 2012...

Geotechnical Considerations for Longwall Top Coal Caving

Figure 3 - Longwall top coal caving system GEOTECHNICAL CONSIDERATIONS FOR LONGWALL TOP COAL CAVING Development and installation roadways The development process at Austar is no different to that of a traditional longwall mining operation The normal development roadway dimensions are < 52 m wide x 32 m high these dimensions are at the...

How does Longwall Top Coal Caving work LTCC Mining

Longwall Top Coal Caving LTCC is a special designed longwall mining method for very thick seams thickness is more than 45m where good quality coal is being left because conventional...

Longwall Top Coal Caving LTCC Mining Technology

Longwall Top Coal Caving LTCC is a special designed longwall mining method for very thick seams thickness is more than 45m where good quality coal is being left because conventional longwall equipment has not yet been designed to operate successfully beyond around 5m mining...

Longwall Top Coal Caving Mechanisms in the Fractured Thick

Aug 08 2020 0183 32 Associate Professor Coal Industry Engineering Research Center of Top Coal Caving Mining China Univ of Mining and Technology D11 Xueyuan Rd Haidian District Beijing 100083...

Effect of Key Parameters on Top Coal First Caving and Roof

May 05 2020 0183 32 The first caving of top coal and the first weighting of roof strata in Longwall Top Coal Caving LTCC mining were analyzed in a parametric study by using a discontinuum modeling technique with plastic rock material The analysis demonstrated that an increase in the value of cover depth decreases the stability of main roof strata while the...

Application of Longwall Top Coal Caving in Challenging

Abstract-Longwall top coal caving LTCC techniques has been employed in favourable geological conditions widely in China since the mid-80s and in Australia recently With the improvement of highly-powered face equipment and the method itself in the past 15 years LTCC was introduced to more challenging geological...

Numerical Investigation of Top Coal Drawing Evolution in

Downloadable In longwall top coal caving LTCC the resource recovery ratio of the working face is directly determined by the top coal recovery ratio An investigation of the evolution of top coal drawing characteristics and revealing the evolution of top coal drawing parameters is necessary when providing guidance for caving parameter selection and improving the top coal recovery ratio...

longwall coal mining video

The Principle of Longwall Top Coal Caving LTCC YouTube Apr 30 2015 has extensive experience in the design of roof supports for specific mining conditions Longwall Top Coal Caving LTCC roof supports allow mining of seams seams thicker than 6 Chat Online Amazon® Longwall Mining...

Longwall top coal caving mining Longwall Mining 3rd

Longwall top coal caving mining By Syd S Peng This chapter summarizes the major components of Longwall top coal caving mining LTCC emphasizing its major differences from the regular longwall mining In the upper layer the top coal having been crushed to broken coal by the subsiding action of the roof strata due to the regular longwall...

Mining Engineering Design

3Longwall top coal caving LTCC mining engineering design Longwall top coal caving LTCC is a special designed longwall mining method for very thick seams thickness is more than 45m where good quality coal is being left because conventional longwall equipment has not yet been designed to operate successfully beyond around 5m mining height...

Longwall Top Coal Caving Mechanisms in the Fractured Thick

Aug 08 2020 0183 32 Associate Professor Coal Industry Engineering Research Center of Top Coal Caving Mining China Univ of Mining and Technology D11 Xueyuan Rd Haidian District Beijing 100083 China Email email protected...

The Key Stratum Structure Morphology of Longwall

Longwall mechanized top coal caving mining LMTCCM in extra-thick coal seams has its own characteristics The law of mining pressure and overlying strata failure height in extra-thick coal seams are much larger than those of medium-thick and thick coal...

Longwall Top Coal Caving Top Coal Caving Top Coal Caving

Longwall Top Coal Caving LTCC is a special designed longwall mining method for very thick seams thickness is more than 45m where good quality coal is being left because conventional longwall equipment has not yet been designed to operate successfully beyond around 5m mining height...

Mining Safety of Longwall Top

2Zhangji Coal Mine Xuzhou Mining Bureau Xuzhou 221147 Jiangsu Province PR of China ABSTRACT Longwall top-coal caving technology has developed rapidly in China in recent years The application of longwall top-coal caving can double both the productivity and the efficiency of a working face and reduce the cost of production by 30 to 40o/o...

Numerical Investigation of Top Coal Drawing Evolution in

As one of the main methods for underground thick seam mining longwall top coal caving LTCC has been fully developed and applied in China 1 The coal seam is di-vided into two parts in LTCC bottom coal and top coal Bottom coal is cut directly by the shearer while top coal is finally caved from the drawing opening under its self-weight...

Viewpoint Mining Magazine

Longwall Top-Coal Caving A productive and efficient alternative Longwall mining is one of the most productive ways to produce coal but longwall mines have trouble efficiently mining seams higher than 6 m 196 ft Longwall Top-Coal Caving can more than double the resource recovery rate of normal longwall equipment working in high seams...

Longwall Top Coal Caving Introduction underground COAL

Longwall Top Coal Caving Longwall top coal caving LTCC is a special type of longwall mining applicable to very thick seams greater than 45m where good quality coal is being left because conventional longwall equipment has not yet been designed to operate successfully beyond around 5m mining...

Mining Safety of Longwall Top

2Zhangji Coal Mine Xuzhou Mining Bureau Xuzhou 221147 Jiangsu Province PR of China ABSTRACT Longwall top-coal caving technology has developed rapidly in China in recent years The application of longwall top-coal caving...

Application of retreating and caving longwall top coal

The present paper discusses the application of the longwall top coal caving method and its advantages and disadvantages compared with conventional longwall mining at the mine In general adequate retreat rates were achieved once sufficient experience of the top coal caving...

Latest Developments in Longwall Mining Technology

2015 MININGCA TCOM 6 Roof Support Technology Since 2006 has specialized in designing and supplying special shields for the longwall top coal caving method LTCC where extremely thick seams are being mined This method utilizes a second AFC behind the shields to take the coal on top of the longwall outside of the face...

LONGWALL TOP COAL CAVING MINING Zhengyang Song 1

A 3D particle-based numerical approach to simulate the longwall top coal caving LTCC process was proposed which for the first time the effect of continuous support advance and the face-end...

Numerical Investigation of Top Coal Drawing Evolution in

Downloadable In longwall top coal caving LTCC the resource recovery ratio of the working face is directly determined by the top coal recovery ratio An investigation of the evolution of top coal drawing characteristics and revealing the evolution of top coal drawing parameters is necessary when providing guidance for caving parameter selection and improving the top coal...

Mining Engineering Design

3Longwall top coal caving LTCC mining engineering design Longwall top coal caving LTCC is a special designed longwall mining method for very thick seams thickness is more than 45m where good quality coal is being left because conventional longwall equipment has not yet been designed to operate successfully beyond around 5m mining...

Numerical Investigation of Top Coal Drawing Evolution in

As one of the main methods for underground thick seam mining longwall top coal caving LTCC has been fully developed and applied in China 1 The coal seam is di-vided into two parts in LTCC bottom coal and top coal Bottom coal is cut directly by the shearer while top coal...

Fracture criterion of basic roof deformation in fully

To explore the structure evolution of overlying strata and pressure characteristics of coal mining with large dip angle the basic roof mechanical model was established that based on the thin plate...

Numerical modeling of longwall top coal caving method at

The preferred mining method for these thick coal seams is the Longwall Top Coal Caving LTCC The connection of both the top coal caving and its compactness are still rare therefore the capability of top coal caving mechanism is the most significant factor in...

3D numerical modeling of longwall mining with top

The size distribution of the broken top coal blocks is an important factor affecting the recovery ratio and the efficiency of drawing top coal in longwall top coal caving LTCC mining panel The standard deviation of top coal block size ╬┤ t is one of the main parameters to reflect the size distribution of top coal...

Longwall Top Coal Caving Introduction underground COAL

Ultra-thick Seam Longwall Mining in China Coal Age...

Longwall Top Coal Caving LTCC technology

Yancoal introduced the Longwall Top Coal Caving LTCC mining technology to Australia at its Austar mine in 2006 Developed in China top coal caving uses a modified long wall mining system LTCC allows the excavation of thick coal seams of 5 to 12 metres at one pass of the longwall machine generating high productivity and economic returns for...