Longwall Top Coal Caving Mining

  1. Home >>
  2. Blog >> 
  3. Longwall Top Coal Caving Mining

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 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. It enables an increased recovery for only an incremental ...

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 increase recoveries, potentially at a reduced costtonne, there has been ...

Mining Safety Of Longwall Topcoal Caving In China

Jul 01, 1999 articleosti20020940, title Mining safety of longwall top-coal caving in China, author Wu, J and 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.

Energies Free Fulltext Longwall Topcoal Caving

Longwall top-coal 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 top-coal failure mechanisms are dominated by both compressive and tensile stresses. Ahead of the face line, shear failure initiates at the lower level of the top-coal and ...

Longwall Top Coal Caving Mechanisms In The Fractured Thick

Aug 08, 2020 Effect of Key Parameters on Top Coal First Caving and Roof First Weighting in Longwall Top Coal Caving A Case Study International Journal of Geomechanics March 2020 Dynamic Distribution of Voidage in Longwall Coal Mining-Disturbed Strata

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 Simulation Of Realistic Top Coal Caving

Jun 24, 2021 Top coal caving mining technology started in the 1980s and continues to this day 1,2.Longwall top coal caving LTCC mining consists of two

Optimizationofcavingtechnologyinanextrathickseamwith

e optimization of top coal caving technology is an ecient 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.

Caterpillar To Supply Two Complete Longwall Top Coal

Jul 02, 2014 The longwall top coal caving LTCC mining method to be employed at the Eynez East underground coal mine is a special type of longwall mining applicable to seams thicker than 6

Caterpillar To Supply Two Complete Longwall Top Coal

The longwall top coal caving LTCC mining method to be employed at the Eynez East underground coal mine is a special type of longwall mining applicable to seams thicker than 6 meters 20 feet. Conventional longwall equipment has not yet been designed to operate successfully in seams thicker than approximately 6 meters 20 feet mining height.

Propagating Mechanism Of Topcoal Fracture In Longwall Top

BBR study of top-coal drawing longwall top-coal caving mining J. Journal of China Coal Society, 2015, 40 3 487493 in Chinese. 11 WANG J C, ZHANG J W, LI Z L.A new research system for caving mechanism analysis and its application to sublevel topcoal caving mining J.

Iop Conference Series Earth And Environmental Science

Aug 12, 2021 In the recent decade, the longwall mining systems used in top coal caving have been given additional functions connected with control of coal extraction above and behind the powered roof support. The authors have examined the patent documentation and invention activity in the field of the LTCC methods and equipment in the top coal mining countries.

In Situ Investigations Into Mininginduced Overburden

Apr 25, 2017 Preventing water seepage and inrush into mines where close multiple-seam longwall mining is practiced is a challenging issue in the coal-rich Ordos region, China. To better protect surface or ground water and safely extract coal from seams beneath an aquifer, it is necessary to determine the height of the mining-induced fractured zone in the overburden strata.

Coal Zoom Longwall Topcoal Caving A Productive And

Dec 04, 2018 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

Longwall Top Coal Caving Mining Zhengyang Song

Jul 22, 2021 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 ...

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

Mining Safety Of Longwall Topcoal Caving In 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. 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 40oo.

Pdf Longwall Top Coal Caving Design For Thick Coal

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.

Geotechnical Considerations For Longwall Top Coal

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

Long Wall Top Coal Caving Slideshare

Nov 15, 2017 Long wall top coal caving 1. LONGWALL TOP COAL CAVING P SHASHIKANTH 16MT001042 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.

Ultrathick Seam Longwall Mining In China Coal Age

Oct 24, 2013 The disadvantages of top coal caving are that the recovery rate of top coal at both ends of the face is very low and the coal left in the gob is the source for spontaneous combustion. Therefore, the ultra-thick whole seam one slice longwall mining was developed to increase the recovery rate and safety of ultra-thick coal seams in 2009.

3d Numerical Modeling Of Longwall Mining With Topcoal Caving

Modelling of strata movement with a special reference to caving mechanism in thick seam coal mining By Bahtiyar nver Monitoring and modelling of gas dynamics in multi-level longwall top coal caving of ultra-thick coal seams, Part II Numerical modelling

Longwall Top Coal Caving At The Broadmeadow Mine

May 14, 2019 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.

Thick Seam Mining Methods Longwall Top Coal Caving

Thick Seam Mining Methods - Longwall Top Coal Caving Contact us. For more information, contact Dr Chengguo Zhang. E Chengguo.zhangunsw.edu.au. Australia has very large thick seam coal resources. As a result, there has been ongoing research conducted by the School and others into suitable mining methods that are capable of safe, efficient and ...

Effect Of Key Parameters On Top Coal First Caving And Roof

May 05, 2020 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 ...

University Of Wollongong Research Online

Austar Mine is the first mine in Australia to successfully implement the Longwall Top Coal Caving LTCC mining method. The mine is extracting the Greta Seam of 6 m thickness at a depth of approximately 520 m. The main overburden unit is the Branxton Formation which is massive and strong fine to medium sandstonesilty sandstonepebbly bands.

A Brief Comparison Of Longwall Methods Used At

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 K se et. al., 1989. 2.3. The Longwall Top Coal Caving Method

Longwall Mining Taylor Amp Francis Group

Nov 18, 2019 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.

Numerical Modelling Of Anomalous Microseismicity

around a working longwall top coal caving LTCC panel at Coal Mine Velenje in Slovenia. During a monitoring period of twelve weeks in 2011, a seismic anomaly characterised by a decrease in event counts and an increase in the average seismic energy released was

Longwall Top Coal Caving Mining Zhengyang Song

Jul 22, 2021 Based on the loose medium flow field theory, the loose top-coal drawing law of longwall top-coal caving LTCC mining technology is studied by using self-developed three-dimensional 3D

Longwall Top Coal Caving Ltcc Technology Yancoal

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 an

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.

Caving Mechanisms Of Loose Topcoal In Longwall Topcoal

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 .

3d Numerical Modeling Of Longwall Mining With Topcoal

Feb 01, 2005 Coal has been produced by means of longwall retreat with the top-coal-caving production method where a 2.8 m high longwall face was operated at the floor of the coal seam Fig. 4. Top-slice coal having a thickness of 5.2 m was caved and produced through windows located at the top of the shields. Download Download full-size image Fig. 3.

Mining Safety Of Longwall Topcoal Caving In China

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 40oo. Using standard longwall equipment, annual production can reach 3 million metric tons Mt, and a maximum of 4.1 Mt has