Menu
WhatsApp
Longwall top coal caving LTCC mining technologies with roof softening by forming in the space after selected coal seam as a result of caving roof rock littering over this seam This debris is created by the chaotically freely falling rock In the paper there are presented results of numerical analysis whose aim was to determine the
WhatsApp 
To extract these thick coal seams the chosen method for mining is Top Coal Caving The Longwall Top Coal Caving LTCC has been the preferred underground mining method that has been developed and then accepted by its guaranteed results in China''s coal mining industry
WhatsApp 
The geological structure of the WCM in China is shown in Fig 1 Fig 1 shows the syncline structure and its south mining area is a typical SIETCS group The coal seam used in this study is No B3 6 with a dip angle of 87° The results of insitu stress measurements are shown in Table maximum horizontal principal stress σ H at each measuring point exceeds the vertical stress σ V
WhatsApp 
Anisotropic numerical analysis on failure modes of dip layered rock slopes and engineering application WH Shi TH Yang PT Wang BB Song D Xia Numerical simulation on topcoal movement law under caving mining technique in steeply dipping seam influenced by caving sequence JW Zhang ZY Song HL Geng
WhatsApp 
The overall height of the numerical model was 8324 m and the floor of the coal seam reached an elevation of 30 m of the numerical model that is the burial depth of the coal seam in the numerical model was 5324 m
WhatsApp 
Karacan CÖ 2013 Integration of vertical and inseam horizontal well production analyses with stochastic geostatistical algorithms to estimate premining methane drainage efficiency from coal seams Blue Creek seam Alabama International Journal of Coal Geology v 114 p 96113
WhatsApp 
1 Introduction Longwall Top Coal Caving LTCC can provide substantially less economic sensitivity and a reduced level of technical risk over other thick seam mining methods 1 A reliable evaluation of LTCCs applicability at the feasibility stage of a new mining project is therefore of importance to the effective and productive extraction of thick coal seams
WhatsApp 
Thick and ultrathick coal seams are main coal seams for high production rate and high efficiency in Chinese coal mines which accounts for 44 of the total minable coal reserve A fully mechanized topcoal caving mining method is a main underground coal extraction method for ultrathick coal seams
WhatsApp 
Numerical simulation analysis on fault pillar optimization of fully mechanized caving in thick coal seam Article · June 2011 with 3 Reads How we measure reads
WhatsApp 
Le TD Oh J Hebblewhite BK Zhang C Mitra R 2017 Numerical analysis of the effect of coal seam characteristics on the longwall top coal cavability in WV University ed Proc 36th Int''l Conf on Ground Control in Mining 36th Int''l Conf on Ground Control in Mining Morgantown WV USA presented at 36th Int''l Conf on Ground
WhatsApp 
Feb 08 2019 · This paper investigates the pressurerelief response of the floor in top slice mining taking No 2 coal seam in Jinta coal mine as its engineering background The failure laws of the lower slice along strike and with depth during the top slice mining process are analyzed with comprehensive methods including theoretical calculation similar simulation and numerical simulation
WhatsApp 
Dec 11 2019 · Understanding the characteristics of drawing body shape is essential for optimization of drawing parameters in longwall top coal caving mining In this study both physical experiments and theoretical analysis are employed to investigate these characteristics and derive a theoretical equation for the drawing body shape along the working face in an inclined seam
WhatsApp 3D numerical modelling of stresses around a longwall panel with top coal caving by NE Yasitli and B Unver Synopsis There is a considerable amount of lignite reserve in the form of thick seams in Turkey It is rather complicated to predict the characteristics of strata response to mining operation in thick seams
WhatsApp 
Mechanized mining of Longwall top coal caving mining method was used in 1201 work face of thick soft coal seam in Du Jiacun Mine The face is back to the wind drift along the seam floor excavation transport drift along the seam roof boring the two crossheading basic fullcoal roadway due to the relatively soft coal body joints fractured coal strength is low and the coalrock inclination
WhatsApp 
Numerical simulation of the top coal caving process using the discrete element method Article in International Journal of Rock Mechanics and Mining Sciences · September 2009 with 79
WhatsApp 
Thick coal seams seam height larger than 35 m account for a large portion of the proven coal reserves of China and underground thick coal seam mining provides about 50 of the Chinese annual coal production Such seams are mainly mined using the longwall topcoal caving LTCC method
WhatsApp 
The J‐14 coal seam was mined safely without gas accidents and the average gas extraction rate reached 6572 Meanwhile the gas extraction rate of the J‐15 coal seam was improved from 155 to 669 and gas content and pressure were reduced to 191‐446 m 3 t and 011‐037 MPa respectively The ideas and methods proposed in this
WhatsApp 
Forensic analysis of a slide of a large scale slope in a coal mining • Interaction between a fault and the exploitation of a coal seam through sublevels caving method • Control of surface deformation by precision leveling • Analysis of the alteration degree of the slope rock mass by numerical simulation •
WhatsApp 
This study aimed to explore the safe and efficient topcoal caving mining under thin topsoil of shallow coal seam SCS and realize the optimization of hydraulic support Numerical simulation and theoretical analysis were used to reveal the stress distribution of the topsoil the structure characteristics of the main roof blocks and the development of the roof subsidence convergence
WhatsApp 
Abstract The forms of roof break roof fall and effects of the region scope in a fully mechanized topcoal caving FMTC face of the 101 fullymechanized top coal caving face of the Tingnan Coalmine were analyzed by UDEC and FLAC 3D software The analysis result confirms the phenomenon of roof falling roofoffstrata roof breaking first weighting periodic weighting and stress
WhatsApp 
الصفحة الرئيسية
معلومات عنا
اتصل
دردشة على الإنترنت
الخط الساخن للمبيعات