Techno-Economic Feasibility of the Longwall Top Coal ...

An extraction method for deep-seated thick seam deposits by underground mining with high resource recovery has remained a great challenge for Indian mining engineers, whereas the longwall top coal caving (LTCC) method has evolved as an effective method for various geo mining conditions in China and other counties. The percentage of top coal recovery (TCR) …

LONGWALL TOP COAL CAVING MINING | Zhengyang …

2021-7-22 · LONGWALL TOP COAL CAVING MINING | The theoretical shapes of draw body and interface between top coal and gangue are described by mathematical equations.

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Drawing mechanism of fractured top coal in longwall top coal caving, International Journal of Rock Mechanics and Mining Sciences. 2020. (If=4.151) SCI. ESI 4. Xin Cai, Zilong Zhou, Lihai Tan, Haizhi Zang, Zhengyang Song*. Fracture behavior and ...

Longwall Top Coal Caving Mechanisms in the Fractured …

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 top coal. It was revealed the LTCC influenced both magnitude and orientation of the principal stress within top coal.

3D numerical modeling of longwall mining with top-coal ...

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 ...

Longwall Top Coal Caving | Introduction | underground …

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 height.

(PDF) Longwall top coal caving (LTCC) mining technologies ...

2018-5-1 · Longwall top coal caving mining is one of the main methods of mining thick coal seams in China. Terefore, carrying out the classification evaluation of top coal caving is of great significance to ...

The Key Stratum Structure Morphology of Longwall ...

2020-8-28 · 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 seams. The key stratum structure morphology also has an important influence on the law of overlying strata …

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SONG Xuanmin,ZHU Defu,WANG Zhonglun,et al.Advances on longwall fully-mechanized top-coal caving mining technology in China during past 40 years:theory, equipment and approach[J] al Science and Technology,2021,49(3):1-29.doi:10.13199

Longwall Top Coal Caving,Top Coal Caving,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 …

Application of Longwall Top Coal Caving in Challenging ...

2020-1-8 · Application of Longwall Top Coal Caving in Challenging Geological Conditions Ning Shi Terra Energy LLC #29-206, BLK 13, Heping St., Beijing, China 10013 [email protected] Zhizeng Huang China Coal Research Institute #5 Qingniangou East St., Beijing, China 10013 [email protected]

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 (19.6 ft). Longwall Top-Coal Caving can more than double the resource recovery rate of normal longwall equipment working in high seams.

Longwall Mining | Syd S. Peng | Taylor & Francis Group

2019-11-18 · Since the last plow longwall mine was closed in 2018, the chapter on plow longwalling has been dropped and in its place Automation of Longwall Components and System is added. Also, a new chapter Longwall Top Coal Caving Mining (LTCC) is added due to its successful application in Australia since 2005.

Longwall Top Coal Caving (LTCC) technology

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 …

3D numerical modeling of longwall mining with top-coal …

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 (δ t) is one of the main parameters to reflect the size distribution of top coal.

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

Today, the top-coal caving longwall mining is the major mining method for thick seam coal mining in China. In the Datong coal district, the annual production is 1.5 million metric tons per panel. The top-coal caving longwall mining has attained outstanding achievements in coal mines with favorable conditions.

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

Longwall Top Coal Caving (LTCC) technology - Yancoal

Coal Zoom | Longwall Top-Coal Caving: A Productive and ...

2018-12-4 · Longwall Top-Coal Caving: A Productive and Efficient Alternative . December 4, 2018 - In the right conditions, longwall mining is one of the safest, most productive and most efficient ways to produce coal. This is owed in part to the high degree of automation employed by modern longwall operations, which keeps shearers and roof supports advancing smoothly and people …

Stress analysis of longwall top coal caving

Abstract. 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 ...

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2020-5-27 · BBR study of top-coal drawing law in longwall top-coal caving mining. Journal of the China Coal Society, 2015, 40(3): 487-493. (10) Wang JC, Zhang JW, Yang SL, Song ZY. 3-D movement law of top-coal in near horizontal coal seam …

Geotechnical Considerations for Longwall Top Coal …

2020-10-13 · 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 < 5.2 m wide x 3.2 m high, these …

Viewpoint Mining Magazine

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 ...

Mining Safety of Longwall Top-coal Caving in China

2020-11-4 · 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. 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.

Stress analysis of longwall top coal caving | Request PDF

Longwall top coal caving (LTCC) is a relatively new method for mining thick coal seams that is currently achieving high productivity and efficiency in application [40, 41]. The largecutting-height ...

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

2018-10-18 · A good understanding of the caving mechanisms of loose top-coal is significant for longwall top-coal caving (LTCC) mining. In this paper, the equations of the particle motion, top-coal boundary, and drawing body were derived based on the stochastic medium theory. Then, the particles moving boundary and the shape of the top-coal loss were discussed, and the …

(PDF) Longwall Top Coal Caving Method for Barapukuria …

longwall top coal caving mining in stag e III of seam VI under ge o-logical condition pre sented in the prev ious section. For this, the . panel wi dth of 100 m, le ngth of 230 m an d a thickness ...

15. Longwall and caving mining methods

2018-1-30 · 15.3 Longwall coal mining 15.3.1 Basic geomechanics considerations-Primary object of mining design is to achieve pseudo-continuous deformation of the main upper strata overlying the seam.-Lower strength of coal measures rocks: 20~40 MPa of …

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

2014-10-1 · 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 …

Longwall Top Coal Caving at the Broadmeadow Mine ...

2019-5-14 · The Broadmeadow mine was started using a longwall to extract coal at 4.7 m (15 ft) leaving the top section of the seam to fall into the gob. 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.

OptimizationofCavingTechnologyinanExtrathickSeamwith ...

2021-8-4 · e 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 single-opening sequential caving technology (SOSCT) shows the following problems: low recovery ratio, high rock mixed ratio, and poor drawing balance.