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.

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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 far from the dangers of the ...

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

2013-9-5 · 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 …

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Geotechnical Considerations for Longwall Top Coal Caving ...

2020-7-2 · Austar (the last coal mine working the Greta coal se am) introduced an enhanced form of the conventional longwall recovery system called Longwall Top Coal Ca ving (LTCC) to the Australian coal mining industry in 2006. The LTCC technology has since been utilised to extract the Stage 1 …

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A Brief Comparison of Longwall Methods Used at Mining …

2009-9-17 · Figure 3. Multi-Slice Longwall (Xu, 2001) In comparison with top coal caving method, the slicing method is of lower output, higher production cost and less safety (Xu, 2001). From the economic point of view, investment costs for the panel in MSL are twice higher than at the LTCC method (Köse et. al., 1989). 2.3. The Longwall Top Coal Caving Method

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Shortwall stoping versus sub-level longwall caving-retreat ...

Current longwall mining method applied in the mine The current method used in the above-mentioned mines is a sub-level longwall caving-retreat method. In this method, the face is formed perpendicular to the seam strike and implemented in the form of slices 7.5 m thick from the top …

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

The paper discusses advanced top coal caving technologies for thick coal seams and addresses some issues of incomplete coal extraction, which can result in the environmental damage, landscape change, air and water pollution and endogenous fires. The authors put forward a fundamentally new, having no equivalent and ecology-friendly method to difficult-to-cave roof coal - directional hydraulic ...

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An Innovative Longwall Mining Technology in Tangshan …

2017-1-23 · longwall top coal caving (CLTCC) is the main mining method throughout the country [2]. However, problems such as low recovery, fire, coal bumps and bursts, wavy surface subsidence, etc., constrain

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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 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.

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Mining Safety of Longwall Top-coal Caving in China

2020-5-13 · 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.

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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]

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

2018-5-1 · Effective fracture of top coal is the premise of smooth top coal drawing, and the recovery ratio is the comprehensive reflection of the broken degree of the top coal body.... Optimization of Caving...

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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 …

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Top Coal Caving | Longwall | underground COAL

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 …

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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 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.

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RU

2021-8-17 · longwall mining systems used in top coal caving have been given additional functions connected with control of coal above and behind extraction powered roof support. The the authors have examined the patent documentation and invention activity in the field of the LTCC methods and equipment in the top coal mining …

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Latest Developments in Longwall Mining Technology

2019-9-4 · 2015 MINING.CA T 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.

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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 USC and hydrostatic (p = gh) in UK.

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Mining safety of longwall top-coal caving in China ...

@misc{etde_20020940, title = {Mining safety of longwall top-coal caving in China} author = {Wu, J, Qin, Y, and Zhai, M} abstractNote = {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 50%.

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2020-5-27 · Effect of face dip angle on the drawing mechanism in longwall top-coal caving mining. Journal of China University of Mining and Technology. 2018, 47(4): 805-814 (doi: 10.13247/j.cnki.jcumt.000889) (9) Wang JC, Zhang JW. BBR study of top-coal drawing law in

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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.

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Geotechnical Considerations for Longwall Top Coal Caving ...

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 dimensions are at the

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TOP CAVING – Mining Science and Technology

Longwall Topcoal Caving (TCC) 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. With this method of extraction only a single longwall is developed at the foot of the seam. The control …

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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 height 2–3 m is performed ...

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Research on the longwall top-coal caving mining technique ...

【Abstract】Taking the extremely inclined No. 1201 working face in Dayuan Coal Mine, Fengfeng Group, as the engineering background, the basic problems of the longwall top-coal caving mining technique in extremely inclined and soft thick coal seams were systematically studied.The results reveal that the rational design of shield supports is the first necessity for the successful extraction of ...

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Longwall Top Coal Caving (LTCC) technology

Longwall Top Coal Caving | Introduction | underground COAL

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Water Injection in Longwall Top-coal Caving Face in China

2020-11-4 · Dust is a major concern in coal disasters. In longwall top­ coal caving (LTC) faces (Figure 1 ), dust problems be­ come more serious because of unlimited dust sources; large amounts of coal dusts are generated during mine support advancing and top-coal caving. Water injection is an effective method to suppress dust. Figure 1.

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

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.

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Longwall Top Coal Caving (LTCC) technology

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.

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Viewpoint Mining Magazine

Longwall Top-Coal Caving: A productive and efficient alternative 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, …

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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.

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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 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.

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