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·In Tashan Coal Mine the working face is supported by low caving coal hydraulic supports ZF15000//42 The support height ranges from to m with an initial support force of 12778 kN P= MPa a rated working resistance of 15000 kN P= MPa and a support strength of on the four bar mechanism the author established a
·Dynamic sublevel caving technology DSCT proposed by the researchers is one of effective methods to solve the problems of low top coal recovery poor drawing balance and support stability in longwall top coal caving LTCC with large dip angle To investigate the reasonable number of supports in a sublevel N and the top coal drawing mechanisms under
·Longwall Top Coal Caving was initially developed in the former Soviet Union and France in the 1950s and 1960s It was then applied in the former Yugoslavia Hungary Romania the former Czechoslovakia and Turkey [4] [5] [6] The Soutirage method which was developed in France in the 1960s is considered as the original form of LTCC [7] The system
·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 billion metric tons every year accounts for 18% of underground coal mining in China [3]
·The optimization of top coal caving technology is an efficient 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 For these problems this
·Longwall mining is currently the dominant coal extraction method in modern underground coal mines On the basis of normal longwall system Longwall Top Coal Caving LTCC method has been developed to extract thick coal seams of 5 12 m at one pass of the shearer coal cutting machine The general panel layout and ventilation system at a LTCC
·1 Introduction Longwall Top Coal Caving LTCC is an underground mining method developed for thick seam extraction Depending on the coal seam condition various layouts can be considered for the LTCC [1] The full seam height LTCC mining layout has been chosen for this work as it takes full advantage of support pressure in fracturing and breaking
·An in depth analysis of the recorded microseismicity associated with longwall top coal caving mining at Coal Mine Velenje has been recently carried out and reported Cao et al 2020 The microseismic monitoring campaign earmarked nine LTCC panels operating at −80 m and −95 m production levels during the monitoring period between February
·The challenge that the coal mine was facing was that there is an ultra close coal seam right under it with an only m sandstone dirt band in between The simulation study was carried out to investigate the simultaneous recovery of upper remnant coal pillars while mining the ultra close lower panel using longwall top coal caving LTCC
·The longwall top coal caving method with retreat mining is used for winning coal The thickness of coal is m the coal cutting height by shearer is m and the top coal caving height is m Roof strata are naturally collapsed behind shields The drum of the shear is m meaning that the m coal is cut for each web
·The geomechanical model of the powered roof support top coal roof rock system is developed For investigation of disintegration processes in top coal of thick seam numerical modeling with finite element discretization of a study domain is carried out using the authors original code The computational experiment reveals stress distribution in rock mass
·include Multi Slice Longwall High Reach Longwall single slice and Longwall Top Coal Caving LTCC LTCC can mine out a seam varying from 4 to 20m in a single pass requiring insignificant change to the face equipment In comparison to the other two methods respectively especially in complex
DOI / Corpus ID 128702162; 3D numerical modeling of longwall mining with top coal caving article{Yasitli20053DNM title={3D numerical modeling of longwall mining with top coal caving} author={Nazmi Erhan Yasitli and Bahtiyar {"U}nver} journal={International Journal of Rock Mechanics and Mining Sciences} year={2005}
·Longwall mining is a productive method for underground coal recovery however leaving extensive and long term dewatering impacts on the regional hydrology Booth 1986 2006; Luan et al 2020; Sidle et al 2000; Zhang et al 2011 and surface features that are susceptible to groundwater drawdown Hebblewhite 2009 In Australia concerns over past and potential
·Longwall mechanized top coal caving mining LMTCCM in extra thick coal seams has its own characteristics The law of mining pressure and overlying strata failure height in extra thick coal seams are much larger than those of medium thick and thick coal seams The key stratum structure morphology also has an important influence on the law of
·This paper presents an investigation on the interactions of overburden failure zones induced by the mining of adjacent coal seams using the longwall caving method Overburden failure is an important factor in safety assessments in the fields of mining engineering geology and safety geology especially when mining under water bodies In this study the
·Longwall top coal caving LTCC mining technology is a productive and economical method to extract thick coal seams and thus is widely used in many coal mines in China Wang 2009 Wang et al 2014 Although some hypotheses on top coal drawing process were proposed Wang and Fu 2002 Wang et al 2004 Wang et al 2010 Wang et al
·During longwall top coal caving mining of shallow buried thin bedrock and thick coal seams penetrating fractures may form in the rock strata above the roof causing an inrush of water and sand at
The paper systematically summarized the main achievements of the fully mechanized longwall top coal caving technology in passed 20 years in China and the conclusion and understanding on the related issues The paper provided the issues of the theoretical and technical researches to be strengthened in the next step for the fully mechanized longwall top coal caving technology In
·Layered mining has the problem of high requirements for roadway layout and roadway support is relatively difficult [5][6][7] Top coal caving technology has the advantage of high mining
·The changing mining conditions during longwall top coal caving mining LTCC were extracted from a coupled numerical model to provide statistically sufficient data for probabilistic analysis The complex interdependencies among abutment stress pore pressure the volume of total gas emission and incremental energy release rate their stochastic
