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A fully mechanized top-coal caving mining method is a main underground coal extraction method for ultra-thick coal seams. ... The experimental results demonstrated that the vibration effect range ...


The mining rate at a fully mechanized mining face had an effect on dynamic disasters in the coal and rock mass ... Study on influence of mining rate on stress environment in surrounding rock of mechanized top caving mining face, ... Vibration and horizontal directivity analysis of transmitting transducer for acoustic logging while drilling


The study and application of manless fully-mechanized coal mining technology and equipment which used for the thickness of coal seam from 1.4m to 2.2m. Situation of working face: 1, Number of coal mine: 2#. 2, Thickness of coal seam: 1.4-2.2m. 3, Hardness of coal ore: f≈2.5-3. 4, Dip angle of coal …


With the exploitation of coal resources,coal resources in the eastern part are becoming less and less.Along with the implementation of the strategy of western development,the exploitation of coal resources in the West has been put on the agenda.In the process of ultra thick coal seam mining,the shock vibration caused by mining and other factors ...


Common mining methods for thick coal seams or extremely thick coal seams has slice mining top coal caving mining, greater height mining, and surface mining. From the perspective of economic and technological mining method, the choice of methods should be fully taken into account the technical, economic, quality of operating personnel, equipment, geological conditions.


In fully mechanized top‐coal caving (FMTC), the effects of coal caving are closely related to the degree of damage to the top‐coal which is determined by the stress state therein.


12%Longwall top coal caving (LTCC) [] is the main modern fully mechanized coal mining equipment in the thick seam mining of china, as shown in Fig. 1, which consists of the scraper conveyor, coal shearer and hydraulic powered support [].LTCC support is the major supporting equipment [].There exists a collision when the coal–gangue crashes into the metal …


Field studies of top-coal caving mining have been conducted in Tangshan 43 and Zhaogezhuang 44 mines in China to prevent rockbursts and obtained good effects as a result. By analysing the overburden and abutment stress distributions in top-coal caving mining, scholars45, 46, 47 studied the relieving effects of top-coal caving mining on rockbursts.


for mining thick coal seams [2]. During the top-coal caving mining process, the workers control the hydraulic support's window to cave the upper part coal based on the recognition of coal and gangue. Therefore, coal-gangue recognition (CGR) is one of key techniques to intelligentize the process of top-coal caving …


Xie, GX, Chang, JC, Yang, K (2009) Investigations into stress shell characteristics of surrounding rock in fully mechanized top-coal caving face. International Journal of Rock Mechanics and Mining Sciences 46(1): 172 – 181 .


While mining thick coal seams, top-coal caving mining needs to be conducted preferentially over a reasonable range of mining heights. Field practice in Xing'an and Junde mines revealed that the top-coal caving mining induced a lower rockburst frequency, over a smaller range and with lower intensity, which validated the effects of load-shedding ...


Longwall top coal caving mining is a special type of mining method, which is usually used to mine coal seams with a thickness of more than 4.5 m 1.Because longwall top coal caving mining …


Blast-induced ground vibrations from surface coal mine blasting may have a detrimental effect on nearby underground coal mine openings. The effects of these round vibrations generated from surface mining also have been of increasing public concern. Numerous studies on measurement and analysis of ground vibrations, and heir effects on structures


Mining Field Pressure And Coalbed Gas Seepage Solid-Gas Coupled Study In The Condition Of Composite Key Stratum ... and carried on optimal designing to methane pre-extraction parameters in 101 fully mechanized top-coal caving face, extraction effect is remarkable, has achieved certain economic and social benefits. ... Free Vibration And ...


Estimation of First and Periodic Roof Weighting Effect Interval in Mechanized Longwall Mining Using Numerical Modeling ... Effect of Key Parameters on Top Coal First Caving and Roof First Weighting in Longwall Top Coal Caving: A Case Study. International Journal of …


Jiang 7 postulated the roof strata as a kind of arching structure above the top coal caving mining face. The effect of fracture and movement of main roof on the mining face was weakened due to the existence of top coal. In front of the mining face, the physical status of top coal transits from continuous to quasi-continuous and to discrete medium.


The stability of the surrounding rock is the key problem regarding the normal use of coal mine roadways, and the floor heave of roadways is one of the key factors that can restrict high-yield and high-efficiency mining. Based on the 1305 auxiliary transportation roadway geological conditions in the Dananhu No. 1 Coal Mine, Xinjiang, the mechanism of roadway floor heave was studied by field ...


The top coal caving with vibration technique has a higher coal recovery ratio. This technique improves the top coal broken effect and lowers the waste content rate. The significant economic and social benefits proved it to be a promising technique.


In China, coal is the main energy source, accounting for about 70% of primary energy production and consumption 1,2.Since top coal caving mining method has the advantage of high-production, high ...


The first caving of top coal and the first weighting of roof strata in Longwall Top Coal Caving (LTCC) mining were analyzed in a parametric study by using a discontinuum modeling technique with plastic rock material. The analysis demonstrated that ...


Hence, the mining pressure behaviors in the fully mechanized top coal caving face of the "three-soft" coal seam can be summarized as follows: (1) the first and periodic weighting is not obvious; (2) the resultant pressure point of the top coal moves forward, causing unreasonable performance of the rear support; (3) the deformed roof is easy ...


In the process of longwall top coal caving, the selection of the top coal caving interval along the advancing direction of the working face has an important effect on the top coal recovery. To ...


Above Pic, A typical mining planning of longwall top coal caving method. Coal Seam Thickness 4.5-7 Meters; Phase 3rd 6.5-7 Meters. Depth of Coal 400-700 Meters; currently, the mining depth is 530 Meters. An additional AFC is attached to the rear of the chocks and …


caving leads to decline in coal quality and rise in production cost. Over caving also brings great security risk to operators because of the extremely harsh mining environment and complex process of top coal caving. Therefore, achieving automation for top coal caving mining is an important goal.


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


The article discussed the advantages and disadvantages of the traditional long wall top coal caving (LTCC) first, then proposed a new technique of top coal caving with vibration. The theoretical basis of the technique was elaborated.The top coal vibration system and its control system have been designed as such when the system works, the emulsion pump station provides power for whole system ...


Large scale roof strata caving that occurs during coal extraction can irreversibly damage floor strata and result in riskier mining operations. Four research models incorporating floor water pressure were assessed for floor strata failure, using eight methods and two classification systems. A connection between floor strata failure and the coefficient of impact risk was developed. The derived ...


and surrounding rock, we propose the intelligent top coal caving control method and the high-coal-recovery-rate tech-nology for fully mechanized caving faces. With the invention of this technology, China is likely to lead the world in terms of the fully mechanized top coal caving mining technology.


Yao-She, X.; Yang-Sheng, Z. Technique of top coal caving with vibration. In Proceedings of the 6th International Conference on Mining Science & Technology, Seoul, Korea, 24–26 November 2009; Volume 1, pp. 219–226. [Google Scholar] Xu, B. Application of the Longwall Top Coal Caving System in Australian Thick Seam Coal Mines.


Xu, Y. X. et al. Numerical simulation of longwall top-coal caving with extra-thick and hard coal seam based on bonded particle model. J. China Coal Soc. 44, 3317–3328 (2019).


Procedia Earth and Planetary Science 1 (2009) 219 226 The 6th International Conference on Mining Science & Technology Technique of top coal caving with vibration Xie Yao-shea,b,*, Zhao Yang-shengc aSchool of Mines, China University of Mining and Technology, Xuzhou 221116, China bState Key Laboratory of Coal Resource and Mining Safety, Xuzhou 221008, China cSchool of Mining …


Firstly, the top coal caving experiments were carried out with mining portable vibration recorder developed by China University of Mining and Technology (Beijing) in fully mechanized caving faces in the underground mines, and the acoustic pressure data in quantity were acquired; Then, signal preprocessing were carried on to remove trend items ...


The test mine (Wangjialing Coal Mine) is located in Shaanxi Province, China. The length of the working face is 1231 m, the width is 260 m, the average thickness of the coal seam is 6.2 m, and the average burial depth is 309 m. Fully mechanized top coal caving mining with a higher mining height was adopted here.