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top coal caving mining method

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

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

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

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

Jul 07, 2020  Due to the unbalanced top coal drawing process, the recovery ratio is low, and the equipment stability is poor in the longwall top coal caving mining (LTCC) with an inclined seam. Aimed at these problems, this paper proposes the dynamic group caving method (DGCM). The basic procedure is that when the drawn volume of top coal from a support reaches about half, the next

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Longwall Top Coal Caving Method - SlideShare

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.

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Force chains in top coal caving mining - ScienceDirect

Mar 01, 2020  The key subjects involve the mechanism and criteria of top-coal fracturing, splitting and caving, the laws of discrete top coal collapsing and flowing, the formation and transition of mining induced pressure with respect to time and space, and the load on the supports rose from the top coal and overlying strata.1, 2, 3 Wu 4 proposed a self ...

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Coal mining methodsCoal mining methods

Coal mining methodsCoal mining methods ... Mountain top removal mining (Appalachian coal field, USA) Stripping RatioStripping Ratio = Volume of Material (Volume of Material ... Longgp g()wall top coal caving (LTCC) method for extramethod for extra--thick seamthick seam 3030.

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MODERN MINING TECHNOLOGY FOR COAL EXTRACTION

1. Coal loss occuring during the production of the top coal (20 to 30 %) 2. The coal left behind the face poses danger of spontaneous combustion. 3. Poor face alignment may not only cause face roof control problems but also affect the top coal caving process 4. Floor heave behind the rear AFC is likely.

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

The Longwall Top Coal Caving Method In Turkey, the LTCC method has been applying for many years. It is based on the 'Soutirage' longwall caving method originally developed in the French coal mining industry. 142 . The 19th International Mining Congress and Fair of Turkey, IMCET2005, İzmir, Turkey, June 09-12, 2005

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Types of Underground Mining Method Comparison

Mar 16, 2017  Caving Methods of Mining. There are three distinctive methods of working large deposits that involve, in some way, the factor of caving. Slightly different names are in use, but those that are simple as well as descriptive are top slicing, sublevel caving, and block caving.

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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.

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Longwall Top Coal Caving (LTCC) technology - Yancoal

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 ...

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Coal mining methodsCoal mining methods

Coal mining methodsCoal mining methods ... Mountain top removal mining (Appalachian coal field, USA) Stripping RatioStripping Ratio = Volume of Material (Volume of Material ... Longgp g()wall top coal caving (LTCC) method for extramethod for extra--thick seamthick seam 3030.

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

This paper discusses numerical modeling of top coal caving mining method and studies the coal recovery ratio by using discrete element method. In the modeling consequences, the total top coal recovery ratio was computed to be 83.9% when the top coal thickness was three times the cutting height with the drawing interval of 0.8m respectively. ...

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MODERN MINING TECHNOLOGY FOR COAL EXTRACTION

1. Coal loss occuring during the production of the top coal (20 to 30 %) 2. The coal left behind the face poses danger of spontaneous combustion. 3. Poor face alignment may not only cause face roof control problems but also affect the top coal caving process 4. Floor heave behind the rear AFC is likely.

More

Mining Safety of Longwall Top-coal Caving in China

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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A Brief Comparison of Longwall Methods Used at Mining

The Longwall Top Coal Caving Method In Turkey, the LTCC method has been applying for many years. It is based on the 'Soutirage' longwall caving method originally developed in the French coal mining industry. 142 . The 19th International Mining Congress and Fair of Turkey, IMCET2005, İzmir, Turkey, June 09-12, 2005

More

Types of Underground Mining Method Comparison

Mar 16, 2017  Caving Methods of Mining. There are three distinctive methods of working large deposits that involve, in some way, the factor of caving. Slightly different names are in use, but those that are simple as well as descriptive are top slicing, sublevel caving, and block caving.

More

Application of Vibration in Longwall Top Coal Caving Method

PDF Coal is an alternative replacement for oil that has an exhausted prospective to produce energy. The Most of coal seams were located in high depth... Find, read and cite all the research ...

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3-D numerical modelling of stresses around a longwall ...

means of the longwall retreat with top coal caving production method where a 2.8 m high longwall face was operated at the floor of the coal-seam (Figure. 3). Top slice coal having a thickness of 5.2 m was caved and produced through windows located at the top

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Overburden Failure and Ground Pressure Behaviour of ...

The average coal seam thickness was approximately 15.3 m. Fully mechanized top-coal 89 caving mining method was employed. The coal was cut to a height of 3.9 m while the top coal caving 90 height averaged 11.4 m. ZF/15000/27.5/42 hydraulic supports were used. No.5404 and No.5105

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Top-coal movement law of dynamic group caving method in ...

Top-coal movement law of dynamic group caving method in LTCC with an inclined seam Yang, Shengli; Wei, Weijie; Zhang, Jinwang ABSTRACT: In longwall top-coal caving (LTCC) mining with an inclined seam, the recovery rate is low and equipment stability is poor due to the unbalanced top-coal drawing process. To address these problems, this paper ...

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Numerical modeling of longwall top coal caving method at ...

Mar 26, 2020  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 LTCC that must be adequately explained and examined.

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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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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.

More

Numerical modeling of longwall top coal caving method at ...

Mar 26, 2020  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 LTCC that must be adequately explained and examined.

More

Top-coal movement law of dynamic group caving method in ...

Top-coal movement law of dynamic group caving method in LTCC with an inclined seam Yang, Shengli; Wei, Weijie; Zhang, Jinwang ABSTRACT: In longwall top-coal caving (LTCC) mining with an inclined seam, the recovery rate is low and equipment stability is poor due to the unbalanced top-coal drawing process. To address these problems, this paper ...

More

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

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.

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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

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Mining Safety of Longwall Top-coal Caving in China

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.

More

MODERN MINING TECHNOLOGY FOR COAL EXTRACTION

1. Coal loss occuring during the production of the top coal (20 to 30 %) 2. The coal left behind the face poses danger of spontaneous combustion. 3. Poor face alignment may not only cause face roof control problems but also affect the top coal caving process 4. Floor heave behind the rear AFC is likely.

More

A Brief Comparison of Longwall Methods Used at Mining

The Longwall Top Coal Caving Method In Turkey, the LTCC method has been applying for many years. It is based on the 'Soutirage' longwall caving method originally developed in the French coal mining industry. 142 . The 19th International Mining Congress and Fair of Turkey, IMCET2005, İzmir, Turkey, June 09-12, 2005

More

3-D numerical modelling of stresses around a longwall ...

means of the longwall retreat with top coal caving production method where a 2.8 m high longwall face was operated at the floor of the coal-seam (Figure. 3). Top slice coal having a thickness of 5.2 m was caved and produced through windows located at the top

More

Overburden Failure and Ground Pressure Behaviour of ...

The average coal seam thickness was approximately 15.3 m. Fully mechanized top-coal 89 caving mining method was employed. The coal was cut to a height of 3.9 m while the top coal caving 90 height averaged 11.4 m. ZF/15000/27.5/42 hydraulic supports were used. No.5404 and No.5105

More

Block caving: A new mining method arises Geoengineer

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.

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Quantitative Evaluation of Top Coal Caving Methods at the ...

Apr 10, 2021  The top coal caving method is a systematic combination of caving sequence and caving amount, and it possesses a major effect on the top coal recovery in the working face. The current selection process of top coal caving methods is mainly based on physical similarity simulation and empirical control from field tests.

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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 ...

More

Method of underground mining by pillar extraction (Patent ...

A method of sublevel caving and pillar and top coal extraction for mining thick coal seams includes the advance mining of rooms and crosscuts along the bottom of a seam to a height of about eight feet, and the retreat mining of the top coal from the rooms , crosscuts and portions of the pillars remaining from formation of the rooms and cross-cuts.

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