Study On Surrounding Rock Control Technology Of Full 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 ...

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Effect of mining rate on the working face with high ...

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

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Research on Mechanism and Control of Floor Heave of Mining ...

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 ...

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Analysis on the Breaking Law of Soft and Thick Roof of ...

The fully mechanized top-coal caving face 2–100 of coal seam 2# of a mine is located in the first mining section. The thickness of the coal seam is 5.8 m, the dip angle is 0°–2°, the elevation of the working face is + 318 to + 330 m, the thickness of the bedrock is 370–459 m,the average depth is 420 m, the design length of the working face is 700 m, the mining length is 620 m, the ...

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Recognition of rock–coal interface in top coal caving ...

This paper provides a novel rock-coal interface recognition method based on stacked sparse autoencoders (SSAE). Given their different size and hardness, coal and rock generate different tail beam vibrations. Therefore, the rock-coal interface in top coal caving can be identified using an acceleration sensor to measure such vibrations. The end of the hydraulic support beam is an ideal location ...

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Surrounding rock control theory and longwall mining ...

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.

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Impact-slip experiments and systematic study of coal ...

Based on top coal caving mining, impact-slip test between coal gangue and the hydraulic support is designed. To carry out the research, the test bed was proposed and designed, a multi-dimensional contact characteristics information acquisition system was constructed, and impact-slip test was carried out, which providing real and effective test ...

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Strong Ground Pressure Mechanism and Control at the ...

Both seams have simple structures and well field profiles, as well as stable horizons. The longwall top coal caving (LTCC) method is applied to the working face, with a mining height of 3.5 m and a caving height of 3 m. Thus, the mining-to-caving …

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(PDF) Effect of Face Length in Initial Mining Stage of ...

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.

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Guang Hui Xue | Scientific.Net

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 ...

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Application of the Vibration to the Top Coal Caving ...

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.

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Techno-Economic Feasibility of the Longwall Top Coal ...

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.

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Fully-mechanization Mining,Underground Mining,Coal Mining

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 …

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The Effects of Caving of a Coal Mine's Immediate Roof on ...

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 ...

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EFFECTS OF SURFACE MINE BLASTING ON UNDERGROUND …

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

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Numerical investigation of load shedding and rockburst ...

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 ...

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Effect of Key Parameters on Top Coal First Caving and …

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 ...

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Dynamic Random Arching in the Flow Field of Top-Coal ...

The large mining height fully mechanized top-coal caving mining technique has developed rapidly and become the most extensively used mining method for ultra-thick coal seams. The arching of coal/gangue and the drawing out of gangue are peculiar phenomena in the process of fully mechanized top-coal caving mining, which not only affects the recovery of top-coal, but also affects the quality of ...

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Technique of top coal caving with vibration - ScienceDirect

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 …

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Radiation characteristics of natural gamma-ray from coal ...

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 ...

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Analysis on Rock Burst Risks and Prevention of a 54 m-Wide ...

6.2.2. Layer Mining or Fully Mechanized Top-Coal Caving Face with Premining Top Layer. The fully mechanized top-coal caving face inevitably causes significant sectional expansion in adjacent mining roadways, which intensifies mining influences and worsens the appearance of mine ground pressure . The main roof on the 401103 working face is ...

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2194. Recognition of rock–coal interface in top coal ...

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.

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Economic and Technical Analysis of Thick Coal Seam Mining ...

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.

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Effect of upward angle on the drawing mechanism in ...

The longwall top coal caving (LTCC) is an efficient mining method to specifically extract thick or ultra-thick coal seams due to its good adaptability with respect to the large variations of coal ...

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Experimental Investigation into the Bedding Plane Slip ...

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 ...

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Technique of top coal caving with vibration

How to understand the top coal caving process and increase the top coal recovery ratio is one of the urgent problems to be resolved for the longwall top coal caving technology. The paper mainly studies a new theory and technique of top coal caving with vibration. The vibration device is mounted on the shield beam of the top coal caving support.

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Force chains in top coal caving mining - ScienceDirect

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.

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Numerical investigation of load shedding and rockburst ...

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.

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Longwall Top Coal Caving Method - SlideShare

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.

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Application of improved and optimized fuzzy neural network ...

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 …

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