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·The company pioneered many programs over the years as far as safety mine engineering research and development R&D project management coal preparation longwall mining gate road development etc Those efforts continue today with the same high level of enthusiasm the company has had for nearly 150 years
·In the No 52303 working face strong strata behaviour such as roof collapse and sudden roof subsidence have occurred at the working face end and caused serious destruction of soil physical quality
Semantic Scholar extracted view of "Slope stability under the influence of ground subsidence due to longwall mining" by S Peng et al Skip to search form Skip to main content Skip to account menu Semantic Scholar s Logo Search 221 501 780 papers from all fields of science Search
The fracture mining ratio is 6 87 7 02 and the ca ving mining ratio is 2 42 in longwall top coal mining under thick coal seam 6 65 m and soft rock stratum and thick alluvium 102 m The height of water conducting zone obtained by numerical simulation is consistent with the field measurement results
·Zhou et al 3 used the ZY12000/28/64 roof cover hydraulic supports as primary reference objects and constructed a kinetic equation by applying the Lagrange equations of the second kind The kinetic equation was then used to analyze the quality initial height and fracture point of the main roof The results of this study show that these parameters have a profound
·and ground subsidence control Zhang JX et al [34] developed reasonable mining and backfilling schemes according to the numerical simulation results of stress and plastic zone on the coal pillars in
·CAMERON — Northern Panhandle Conservation District officials are in discussions with American Consolidated Natural Resources regarding the company s plan to perform longwall mining under three
·Semantic Scholar extracted view of "Application of underground microseismic monitoring for ground failure and secure longwall coal mining operation A case study in an Indian mine" by G K Ghosh et al Semantic Scholar extracted view of "Application of underground microseismic monitoring for ground failure and secure longwall coal mining
·Longwall mining is a primary method for extracting coal from underground mines As shown in Figure 1 three kinds of mining equipment used in the longwall face are a shearer an armored face conveyor AFC and a roof support shearer moves back and forth along a rail connected to the AFC while the roof support system maintains the
DOI /S1365 1609 97 00004 1 Corpus ID 129655693; Ground movement due to longwall mining in high relief areas in New South Wales Australia article{Holla1997GroundMD title={Ground movement due to longwall mining in high relief areas in New South Wales Australia} author={Lakshmi Holla} journal={International Journal of Rock Mechanics and
·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
·Shendong mining area is a typical representative of high intensity mining in Western mining area e longwall mining is characterized by shallow buried depth large mining height fast advancing
·Shale gas wells located in longwall chain pillars are subject to longwall induced subsurface ground movements Longwall mining on either side of the chain pillars can induce deformations in gas well casings Excessive casing deformations could diminish casing integrity so that intrusive shale gas might leak into the longwall mine jeopardizing mine safety This
·The costly impact of longwall mining subsidence 2 While surface effects are anticipated subsidence isn t without its costs Longwall coal mining operations typically forecast significant expenditures in the tens of millions for subsidence damage to properties and infrastructure During longwall mining in the Tahmoor/
·a mechanized longwall under poor main roof conditions Also numerical methods provide powerful tools for the analysis and design of LTCC mining operation systems with complex mining conditions
1 Introduction In the past decade the depth of underground coal mining increased by 10 to 20 m per year in China [1 2] As a result the mining induced stress becomes increasingly large and the stability of the surrounding rock is dramatically deteriorated [] Such changes in mining conditions cause continuous growth in the frequency of mining accidents such as face fall roof fall
·The goafs formed during coal seam mining have a significant impact on the safety and efficiency of coal production as well as the environmental protection of collieries during and after coal mining In particular the grading of the broken rock mass in a goaf is a critical parameter for studying the flow and mechanical behavior of caving zones However directly
DOI / Corpus ID 233550198; High intensity longwall mining induced ground subsidence in Shendong coalfield China article{Xu2021HighintensityLM title={High intensity longwall mining induced ground subsidence in Shendong coalfield China} author={Jingmin Xu and Weibing Zhu and Jialin Xu and Jiangyu Wu and Yingchun Li}
·Ground subsidence caused by extraction of longwall panels has always been a great concern all over the world Conventional longwall mining system CLMS gives rise to wavy subsidence causing great damage to surface structures A coal mine in Shanxi China utilizes a split level longwall layout SLL for a sub horizontal No 8 coal seam to improve the cavability
·The longwall is the most suitable candidate for mass production technology given the fact that about 50% of the underground coal production comes from longwall technology and the productivity of longwall is comparable to that of opencast coal mines India started its first longwall mining project in Moonidih in 1978
·The development of coal resources has shifted to China s western mining area with fragile eco geological environment as a result of the gradual depletion of the shallow coal seams in eastern Li 2018; Liu et al 2018; Zhang et al 2022a b c; Han et al 2021 At present the Shendong mining area is the main coal producing base with good occurrence conditions of
·Therefore full automation longwall mining or intelligent longwall mining in this paper refers to manless mining at the face In other words normal coal production operations are conducted without any crew members at the face nor at any time the production operations require crew s intervention to correct any problem
·within the ground What is longwall mining Longwall mining is currently the main method of underground coal mining in Australia It is safer and more efficient than other underground coal mining methods and it involves extraction of large rectangular panels of coal by progressively shaving slices of coal from the longwall face under the
·search and development in the area of under ground coal mining equipment automation A brief background to underground coal mining is given and the process of longwall mining is de tailed Some of the major limitations and issues impacting on the productivity and safety of the longwall mining process are highlighted which
