longwall top coal caving

The Principle of Longwall Top Coal Caving (LTCC)

· Caterpillar has extensive experience in the design of roof supports for specific mining conditions Cat Longwall Top Coal Caving (LTCC) roof supports allow m

Viewpoint Mining Magazine Longwall TopCoal Caving

Geotechnical Considerations for Longwall Top Coal Caving

Longwall Top Coal Caving (LTCC) is an enhanced form of the conventional longwall recovery system, whereby a rear Armoured Face Conveyor (AFC) (refer to Figure 3) is utilised to extract coal from behind the powered supports that would otherwise be left unrecovered in thick seam environments The major benefit of LTCC is the ability to safely optimise resource recovery in thi ck seam deposits

Long wall top coal caving SlideShare

· Long wall top coal caving 1 LONGWALL TOP COAL CAVING P SHASHIKANTH 16MT 2 LONGWALL TOP COAL CAVING GENERAL INFORMATION • It is the modified method of longwall mining system • Yancoal introduced the Longwall Top Coal Caving (LTCC) mining technology in Australia at its Austar mine in 2006 • This method has been developed in china in more

Caving mechanisms of loose topcoal in longwall topcoal

· The topcoal caving longwall mining was successfully put on trials in Yangquan Mining Bureau in 1988 and Lu’an Mining Bureau in 1989 At the same time, research on the topcoal caving mining in steeply inclined thick coal seams began with good results Today, the topcoal caving longwall mining is the major mining method for thick seam coal mining in China In the Datong coal

Longwall top coal caving design for thick coal seam in

· Longwall top coal caving (LTCC) is a part of longwall mining that is applicable for thick coal seams China is an important country, which has best practices of LTCC in terms of high production rates The production principle of LTCC is similar to the conventional longwall mining; however, there are two conveyors named as front and rear, which are used to haul the broken coal cut by shearer

Longwall Top Coal Caving | Introduction | underground COAL

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 height It enables an increased recovery for only an incremental additional cost The method originated in Europe but has

Geotechnical Considerations for Longwall Top Coal Caving

Longwall Top Coal Caving (LTCC) is an enhanced form of the conventional longwall recovery system, whereby a rear Armoured Face Conveyor (AFC) (refer to Figure 3) is utilised to extract coal from behind the powered supports that would otherwise be left unrecovered in thick seam environments The major benefit of LTCC is the ability to safely optimise resource recovery in thi ck seam deposits

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 height It enables an increased recovery for only an incremental additional cost LTCC allows the excavation of

Caving mechanisms of loose topcoal in longwall topcoal

· The topcoal caving longwall mining was successfully put on trials in Yangquan Mining Bureau in 1988 and Lu’an Mining Bureau in 1989 At the same time, research on the topcoal caving mining in steeply inclined thick coal seams began with good results Today, the topcoal caving longwall mining is the major mining method for thick seam coal mining in China In the Datong coal

Mining Safety of Longwall Topcoal Caving in China

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

(PDF) Longwall Top Coal Caving Design for Thick Coal Seam

Longwall top coal caving (LTCC) is a relatively new method of mining thick coal seams that is currently achieving high productivity and efficiency in application, particularly in China

Stress analysis of longwall top coal caving ScienceDirect

· Longwall top coal caving (LTCC) is a relatively new method of mining thick coal seams that is currently achieving high productivity and efficiency in application, particularly in China The technique is similar to traditional longwall mining in that a cutting head slices coal from the lower section of the coal seam onto a conveyor belt installed in front of the hydraulic support near the

Longwall Top Coal Caving | Introduction | underground COAL

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 height It enables an increased recovery for only an incremental additional cost The method originated in Europe but has

Longwall Mining SlideShare

· Longwall panels were extracted in both, Top and bottom sections of Queen (Top) seam after allowing for goaf settlement 2 panels in Queen seam bottom section and 8 panels in Queen seam Top section have been completed by producing around 27MT of coal Experience in – varied face lengths, negotiation of fault, in between goaves, steep gradient (1 in 36) Main Problems – Geological

Longwall Top Coal Caving Mechanisms in the Fractured Thick

· 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 strata to be superimposed on the failure process of

Optimization of Caving Technology in an Extrathick Seam

· The optimization of top coal caving technology is an efficient method to improve the recovery ratio in longwall top coal caving (LTCC) In extrathick coal seams, the conventional singleopening sequential caving technology (SOSCT) shows the following problems: low recovery ratio, high rock mixed ratio, and poor drawing balance For these problems, this research verifies the applicability

Longwall Top Coal Caving (LTCC) technology Yancoal

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 an operation The thick coal seam mining technique is a significant advance in underground coal

Energies | Free FullText | Longwall TopCoal Caving

Longwall topcoal caving mechanisms and cavability optimization with hydraulic fracturing are analysed in this study Based on the geological and geotechnical conditions of the Dongzhouyao coal mine, it is revealed that topcoal failure mechanisms are dominated by both compressive and tensile stresses Ahead of the face line, shear failure initiates at the lower level of the topcoal and

LONGWALL TOP COAL CAVING MINING | Zhengyang Song | 1

· A 3D particlebased 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 faceend

Top PDF longwall top coal caving 1Library

Coal seam II is divided into 4 slices of 9 m, 9 m, 9 m and 7 m of thickness where 4 m of the lower part of each slice will be mined out using longwall shearer and 5 m, 5 m, 5 m and 3 m top of each slice respectively will be mined simultaneously with top coal caving The first coalface is remarked as 101 The coalface 101, in which the first digits ‘1’ denoted as the first slice number and

Numerical simulation of realistic top coal caving

· Top coal caving mining technology started in the 1980s and continues to this day 1,2Longwall top coal caving (LTCC) mining consists of two processes: shearer cutting in

The Key Stratum Structure Morphology of Longwall

· Longwall mechanized top coal caving mining (LMTCCM) in extrathick coal seams has its own characteristics The law of mining pressure and overlying strata failure height in extrathick coal seams are much larger than those of mediumthick and thick coal seams The key stratum structure morphology also has an important influence on the law of overlying strata movement and stability of

Effect of Key Parameters on Top Coal First Caving and Roof

· 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 impact of horizontal stress on the main roof strata

3D numerical modeling of longwall mining with topcoal caving

3D numerical modeling of longwall mining with topcoal caving Download Related Papers Modelling of strata movement with a special reference to caving mechanism in thick seam coal mining By Bahtiyar Ünver Monitoring and modelling of gas dynamics in multilevel longwall top coal caving of ultrathick coal seams, Part II: Numerical modelling By Simon Zavsek and Jerneja Lazar Analysis of

Longwall Top Coal Caving at the Broadmeadow Mine

· Longwall Top Coal Caving (LTCC) was introduced in 2012 The presentation will discuss the management of an LTCC face compared to a conventional longwall face and what was learned from both an operational and maintenance perspective The authors will share their ideas on controlling dilution on the rear conveyor as well as their successful use of automation Presentation Not

Longwall Mining SlideShare

· Longwall panels were extracted in both, Top and bottom sections of Queen (Top) seam after allowing for goaf settlement 2 panels in Queen seam bottom section and 8 panels in Queen seam Top section have been completed by producing around 27MT of coal Experience in – varied face lengths, negotiation of fault, in between goaves, steep gradient (1 in 36) Main Problems – Geological