top coal caving mining method

You may also like

Mining Safety of Longwall Top-coal Caving in China

Feb 19, 2014· LTCC • Longwall Top coal Caving (LTCC) is a method of extraction for underground mining of thick seams. • It uses a longwall set-up and natural forces to aid in the winning of coal. 4.

Numerical Analysis of Top Coal Recovery Ratio by using ...

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 …

Numerical Investigation of Top Coal Drawing Evolution in ...

Underground coal production at GLE Turkey was originally won from conventional longwall mining (drill and blast) and more recently from the innovative use of the mechanised longwall top coal caving method. This latter method was introduced to gain maximum tonnage from the extraction of an 8 m lignite coal seam under very difficult mining ...

Longwall Top Coal Caving,Top Coal Caving,Top Coal Caving ...

A further 75%~80% of the additional coal in the seam can be accessed and recovered, significantly improving the total recovery Above Pic,A typical mining planning of longwall top coal caving method Coal Seam Thickness 4.5-7 Meters; Phase3rd 6.5-7 Meters. Depth of Coal Meters; currently, the mining depth is 530 Meters

Caving mechanisms of loose top-coal in longwall top-coal ...

Aug 08, 2020· In this study, the finite difference method (FDM) coupled with a discrete fracture network (DFN) was utilized to analyze longwall top coal caving (LTCC) behaviors. The integrated FDM–DFN model enabled the influence of the preexisting fracture, stress redistribution, stress rotation, caving material compaction, and periodic rupture of roof ...

A Brief Comparison of Longwall Methods Used at Mining of ...

53 Mining Safety of Longwall Top-coal Caving in China Jian Wu, 1 Yueping Qin, 1 and Minghua Zhai1 1China Univ. of Mining and Technology, 011# Xueyuan Road, Haidian Dist, Beijing 100083, P.R. of China; 2Zhangji Coal Mine, Xuzhou Mining Bureau, Xuzhou 221147, Jiangsu Province, P.R of China ABSTRACT Longwall top-coal caving technology has developed rapidly in China, in recent years.

Top Coal Movement Law of Dynamic Group Caving Method in ...

Apr 30, 2015· has extensive experience in the design of roof supports for specific mining conditions. Longwall Top Coal Caving (LTCC) roof supports allow m...

Longwall Top Coal Caving (LTCC) technology - Yancoal

The top-coal caving mining recovery rate is one of the important indexes of evaluating mining technical measures. This paper, by using the similar model and numerical simulation on the ...

Longwall Top Coal Caving Method - SlideShare

Jun 01, 2020· The longwall top coal caving (LTCC) is an efficient mining method to specifically extract thick or ultra-thick coal seams due to its good adaptability with respect to ...

A review of cavability evaluation in longwall top coal caving

Longwall Top Coal Caving. Longwall top coal caving (LTCC) is a special type of longwall mining applicable to very thick seams (greater than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining …

Application of retreating and caving longwall (top coal ...

Longwall Top Coal Caving (LTCC) is a special designed longwall mining method for very thick seams (thickness is more than 4.5m) 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 MINING | Zhengyang Song | 1 ...

A brief description of longwall top coal caving (LTCC) is included at the end of the Longwall section of the Fundamentals of Coal Mining module of this web site. Despite the fact that there are numerous coal seams in Australia which are thick enough for LTCC to be used to increase recoveries, potentially at a reduced cost/tonne, there has been ...

Systems of Mining - ore, coal, slicing, caving, method ...

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

Coal mining - Choosing a mining method | Britannica

Longwall Top Coal Caving (LTCC) is a special designed longwall mining method for very thick seams (thickness is more than 4.5m) 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 (LTCC) Mining Technology

Jul 25, 2018· Block caving is a new alternative method of developing new mines or extending the operation of open pits. Block caving is an underground hard rock mining method that involves undermining an ore body, allowing it to progressively collapse under its own weight. It is the underground version of open pit mining.

Numerical Study on an Applicable Underground Mining …

Oct 01, 2014· The top-coal caving longwall mining is one of the major mining methods for extracting thick coal seams in China. The top-coal caving mining was estimated to have produced about 0.6 billion metric tons every year, accounts for 18% of underground coal mining in China .The major features of the top-coal caving mining are that a conventional longwall mining with cutting height 2–3 m is …

Drawing mechanism of fractured top coal in longwall top ...

Oct 01, 2019· 1. Introduction. In China, the reserve and production of thick seam coals accounts for 45% of underground coal resources and production, and the longwall top-coal caving technique (LTCC) is one of the major mining methods used to extract thick coal seams.1, 2, 3 The technique was first applied in the 1940s in Russia and subsequently used in France, former Yugoslavia, Hungary, …

The Principle of Longwall Top Coal Caving (LTCC) - YouTube

Underground coal production at GLE Turkey was originally won from conventional longwall mining (drill and blast) and more recently from the innovative use of the mechanised longwall top coal caving method. This latter method was introduced to gain maximum tonnage from the extraction of an 8 m lignite coal seam under very difficult mining ...

Longwall Top Coal Caving Mechanisms in the Fractured Thick ...

Longwall Top Coal Caving (LTCC) is a special designed longwall mining method for very thick seams (thickness is more than 4.5m) 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,Top Coal Caving,Top Coal Caving ...

Systems of Mining ore, coal, slicing, caving, method, top, system, explosives, pillars and cent ... The principal difference is that a single slice only is worked in these methods when applied to coal mining. There are two modifications: top slicing by drifts and top slicing by rooms.

Application of Longwall Top Coal Caving in Challenging ...

There exist several different methods in Turkey and in the world to operate longwalls of thick coal seams in underground mines. The most important ones are Single Pass Longwall (SPL), Multi-Slice Longwall (MSL), and Longwall Top Coal Caving (LTCC). In this paper these methods are compared to eachother both from the technical and economical perspectives.

Longwall Top Coal Caving | Introduction | underground COAL

longwall top coal caving method, slicing method, blast-ing gallery method, and hydraulic mining method etc., depending on local geological and geotechnical condi-tions and thickness, depth and characteristics of seams. Thick seam mining is very different from conventional coal mining in many aspects. It is rather complicated to