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Application of retreating and caving longwall (top coal

Sep 05, 2021The 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 method allowed the method to be refined.

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Ground Response and Mining

around the gate during longwall top-coal caving [25]. Itbution resulting from the longwall mining. us, mining-induced stress should be investigated for optimizing the groundcontrol. vkIkfwf fw fF IF e ovins 8villar ovult e e v Urth v v kIkfw-v e e v e e I e f (a) FLFwm Odstone 8olumn —ck 8oal

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Effi cient Mining of High Seams with Automated LTCC

Jul 16, 20212021 , INC. .COM/MINING 5 The principle of top coal caving technology LTCC is a special type of longwall mining used in very thick seams, typically bigger than 6 m. In these geological conditions, the resource coal is often left unmined because conventionally used equipment cannot operate successfully beyond 6 m mining height.

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Ground Control Principals for Longwall Top Coal Caving Mining

Article Navigation Ground Control Principals for Longwall Top Coal Caving Mining

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

May 01, 2021longwall top-coal caving mining technolog y," Jiachen Wang, Jinwang Zhang, Zhengyang Song . and Zhaolong Li (China University of Mining and Technology) investigate the loose top-coal drawing .

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Longwall Top Coal Caving Mechanisms in the Fractured Thick

Aug 08, 2021Associate Professor, Coal Industry Engineering Research Center of Top Coal Caving Mining, China Univ. of Mining and Technology, D11 Xueyuan Rd., Haidian District, Beijing 100083, China. Email: [email protected]

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Numerical simulation of realistic top coal caving

Jun 24, 2021To explore a realistic top coal caving interval of the longwall top coal caving working face, longwall top coal caving panel 8202 in the Tongxin Coal Mine is used as an example, and 30 numerical simulation models are established by using Continuum-based Distinct Element Method simulation software to study the top coal recovery with 4.0 m, 8.0 m

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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 2021, a seismic anomaly characterised by a decrease in event counts and an increase in the average seismic energy released was

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3

adjacent longwall panels, namely M1 and M2, had been completed and the production was being carried out at M3 panel as shown in Figure 2. Coal has been produced by 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

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A particle

Sep 05, 2021A 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 support were considered. The shape of drawing body and top coal boundary and the distribution characteristics of coal loss were analysed. The top coal flow trajectories and velocity

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Chinese Longwall Manufacturers.

Sep 10, 2021The longwall was a China National Coal Mining Equipment (CME) top caving face, 240 metres wide and with a 2km panel length. The operation is a 365 days, 24/7 operation. The mine, which features two top coal caving faces and which has been operating since January 2021, has planned utilisation to keep the output conveyor belt full.

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Manuscript V1 V1

The No.8105 longwall working face was 200 m wide and 1757.1 m long and 440– 88 450 m deep. 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

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The Key Stratum Structure Morphology of Longwall

The Key Stratum Structure Morphology of Longwall Mechanized Top Coal Caving Mining in Extra-Thick Coal Seams: A Typical Case Study Fulian He,1 Xiaobin Li,1 Wenrui He,1 Yongqiang Zhao,2 Zhuhe Xu,1 and Quansheng Li1,2position on the coal wall. According to the geological

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Longwall Top Coal Caving Method

Feb 19, 2021LTCC • 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. Problems Associated With Thick Seam Extraction • Underground Coal loss. • Heavy cost of supporting working places in productive faces.

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Longwall innovations to debut

Jul 09, 2021DBT has built Australia's first Longwall Top Coal Caving (LTCC) system at the AUSTAR mine in the Hunter Valley. The LTCC shield on display — like the ones in service in the mine — allows

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Analysis of the Geomechanical Phenomena That Led to the

Abstract: Thick coal seam no. 3, block V, Lupeni mine was mined by longwall top coal caving (LTCC). After the coal mining, the ground surface underwent continuous subsidence, but since 2021, three sinkholes have appeared on the surface with important dimensions, atypical for the geo-mining conditions in this coal basin.

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Numerical Analysis of Top Coal Recovery Ratio by using

Caving mechanisms of loose top-coal in longwall top-coal caving mining method. International Journal of Rock Mechanics and Mining Sciences, 71, 160

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A Brief Comparison of Longwall Methods Used at Mining of

Figure 3. Multi-Slice Longwall (Xu, 2021) In comparison with top coal caving method, the slicing method is of lower output, higher production cost and less safety (Xu, 2021). From the economic point of view, investment costs for the panel in MSL are twice higher than at the LTCC method (Kse et. al., 1989). 2.3. The Longwall Top Coal Caving Method

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CiteSeerX — GEOLOGICAL AND GEOTECHNICAL INFLUENCES ON

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): ABSTRACT: Longwall Top Coal Caving (LTCC) is a means of efficiently mining thick (4.5m) coal seams and is an established technology in China with more than 20 years experience and over 100 faces in operation in a variety of different mining conditions. A CSIRO – ACARP funded project has utilised the database of

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LTCC

LTCC stands for Longwall Top Coal Caving (mining) Suggest new definition. This definition appears rarely and is found in the following Acronym Finder categories: Science, medicine, engineering, etc. See other definitions of LTCC. Other Resources: We have 44 other meanings of LTCC in our Acronym Attic.

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Longwall Mining, 3rd Edition

Jun 30, 2021Since the last plow longwall mine was closed in 2021, 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 2021.

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Appendix I1 Subsidence Prediction Report Rev G

longwall coal and longwall top coal caving mining at the proposed Red Hill Mine (RHM) longwall project. Two separate scenarios required subsidence predictions as follows: Scenario 1 – "Mitigated Case": In areas not overlain by the Isaac River or significant faults a longwall extraction thickness of 9.6m is modelled based

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A Review of Roof Instabilities Associated With Longwall

Jun 17, 2021Longwall Top Coal Caving (LTCC) is a thick coal seam mining method which uses the Single Pass Longwall (SPL) method for extracting the lower section while the upper section (top coal) is mined by means of caving. The mining height in LTCC, compared to other methods, may result in roof instabilities such as caving and weighting.

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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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full

Full Mechanized Mining (longwall) on 78 Degree Steeply Inclined Coal Seam. 3212 (II) Working Face of Lushuidong Coal Mine of Guangneng Company of Sichuan Coal Group is located in the West Wing of Daluowan anticline. The panel length of this coal mine is 550

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Low coal seam Longwall mining,longwall mining,low coal

Low coal seam mining ground adjustment . Our advantages. The longwall coal mining technology has been successfully applied in coal mine with thickness of 0.8m, the maximum dip angle 45 . Low coal seam comprehensive mechanized mining range 0.45m ~ 2.5m. Low Coal Seam Longwall Coal Mining Units Equipment . Low coal seam series drum electric

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Advancing and Retreating Longwalls ~ Mining Engineering

May 26, 2021Advancing longwall gateroads typically require extensive maintenance to maintain the roadway cross-section (roof and floor brushing) during the life of the longwall block, whereas retreat longwall gateroads are allowed to collapse behind the retreating face. The only real advantages of advancing longwalls are: Production can begin earlier as

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PAPER OPEN ACCESS Functional schemes of automated and

Mar 14, 2021equipment in longwall top coal caving method (LTCC) with coal discharge to face conveyor. The application of the proposed schemes lessens the influence of the human factor, prevents coal dilution, eliminates conveyor overloading, decreases workload of shearer operator in face area and reduces the probability of making errors by operators. 1.

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China Manufactures First Complete Longwall

Apr 28, 2021Datong is the third largest state-owned coal mining enterprise in China. Tongmei Group, the parent of Datong, first acquired an AFC in 2021 from the company that is now .

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Viewpoint Mining Magazine

Longwall Top Coal Caving (LTCC) was introduced in 2021. Another customer, CNX Coal Resources, gave a presentation called "Monster Wall," discussing the concepts, factors, restrictions and other considerations the mine faced when expanding the longwall face length from 457 to 610 meters (1,500 to 2,000 feet).

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