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In longwall top coal caving (LTCC), fractures in the top coal are the most significant factors to consider when assessing top coal cavability. Fractures in the floor have an adverse impact on longwall mining practice and play a significant role in safe mining above confined aquifers.
Experimental Investigation into the Bedding Plane Slip Effect on the Overlying Strata Behavior in Longwall Top Coal Caving of Soft Coal Seam. Hengfeng Liu, 1,2 Jixiong Zhang, 1,2 Nan Zhou, 1,2 Qiang Sun, 1,2 Meng Li, 1,2 and Zhizhong Cui 1,2. 1 State Key Laboratory of 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 successfully beyond around 5m mining height.
The aim of this project was to provide the Australian underground coal mining industry with an up to date, state of the art summary of the Longwall Top Coal Caving (LTCC) mining system and its potential for application in Australia.
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.
2011 Underground Coal Operators' Conference The AusIMM Illawarra Branch 10 – 11 February 2011 29 GEOTECHNICAL CONSIDERATIONS FOR LONGWALL TOP COAL CAVING AT AUSTAR COAL MINE Adrian Moodie1and James Anderson ABSTRACT: Austar Coal Mine has had a long association with difficult strata control conditions associated with depth of mining and a highly jointed/cleated coal .
Caving mechanism in the top-coal-caving method top-coal-caving production method where a 2.8 m high longwall face was operated at the floor of the coal seam Undoubtedly, caving of naturally fractured or blasted top coal under gravity is the most critical factor in determination of mining method-related parameters such as geometry and dimensions ...
May 14, 2019· 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.
Apr 12, 2016· The Principle of Longwall Top Coal Caving (LTCC) - Duration: 3:58. ... This video provides a basic description of the long-wall mining method for extracting coal underground. It includes an ...
The Principle of Longwall Top Coal Caving (LTCC) - YouTube. Jul 2, 2019- The Principle of Longwall Top Coal Caving (LTCC) - YouTube. Visit. The Principle of Longwall Top Coal Caving (LTCC) July 2019. has extensive experience in the design of roof supports for specific mining conditions. Longwall Top Coal Caving (LTCC) roof ...
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.
One of the ways longwall mines achieve or exceed their owners' expectations is through the use of highly efficient Longwall Top Coal Caving (LTCC) technology production, in combination with the extensive use of automation. LTCC remains a seldom used method for mining high seams efficiently and ecologically with sustainable use of deposits.
Longwall Top Coal Caving The Longwall Top Coal Caving (LTCC) roof support allows mining to a total seam height of more than 10 m (33 ft) by using a longwall shearer to cut the bottom 2.80 – 3 m (9.20 – 9.80 ft) and then caving the top coal behind the roof supports onto a rear AFC. This type of longwall is in service
Introduced and improved over the last 20 years, the Longwall Top Coal Caving (LTCC) method, used for extracting thick seams (greater than 4.5 m), was recently launched in Australia. More than 90 such longwalls already operate in China.
The method employs both coal cutting of the lower portion of the coal seam accompanied by caving and reclamation of the 'top' coal. Coal is first cut from the longwall face using a conventional shearer and AFC arrangement working under hydraulic face supports that incorporate a rear coal conveyor and cantilever / flipper arrangement.
May 26, 2017· 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.
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 ...
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 .
Both longwall systems are designed for longwall top coal caving (LTCC) in a coal seam with an average thickness of 25 meters (82 feet). is the leading supplier for the coal producing industry in Turkey with four out of five longwall underground mining systems in operation.
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 seam...
assigned a uniform height of 3.5m and the top coal was assigned with remaining height of the coal seam. The bottom part was extracted using the normal longwall extraction method. The top coal was extracted in such a way that it mimics the real top coal caving mechanism, i.e. top coals located
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.
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.
10 yielding, coal face spalling, strong deformations of goaf-side entry, and severe ground pressure 11 dynamic events typically occur at the longwall top coal caving longwall faces. Based on the Key 12 strata theory an overburden caving model is proposed here to predict the multilayered hard strata 13 behaviour. The proposed model together with ...
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