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effect of vibration on top coal caving mining

Effect of Key Parameters on Top Coal First Caving and Roof ...

 · The study confirmed that an increase in the value of immediate roof rock strength, coal strength, coal elastic modulus, and coal bedding spacing improves the stability of top coal before its first caving, whereas an increase in the value of top coal thickness, cover depth, and horizontal stress magnitude facilitates the commencement of top coal ...

Case Study on Overburden Fracturing during Longwall Top ...

 · In LTCC mining, top coal caves behind the longwall support shields to the floor of the coal seam. Caving of the top coal, important for efficient LTCC production, is closely related to the formation of fractures in the top coal. There have been numerous efforts to improve the efficiency of mining thick coal seams.

1. Introduction

He X.-Q. Dou L.-M. Song D.-Z. Wang G.-F. Numerical investigation of load shedding and rockburst reduction effects of top-coal caving mining in thick coal seams International Journal of Rock Mechanics and Mining Sciences 2018 110 266 278 10.1016/j.ijrmms.2018.08.005 2-s2.0-85052901363 33 Mohammad N. Reddish D. J. Stace L. R.

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 ...

Prevention of rock burst by protective seam mining in high ...

 · The reason of the impact pressure on the trough is analyzed through numerical simulation analysis, which provides guidance for future mining. By studying the protective effect of the 1st coal protective layer caving on the 4th coal protected layer in 1410 workface, the stress of the deep coal rock mass is reducing, and achieve the purpose of ...

Figure 19 from A Coal Burst Mitigation Strategy for ...

Figure 19: Field measurement of convergences of 1410 and 1411 tailgates. (a) Convergences of 1410 and 1411 tailgates against time after development. (b) Convergences of 1410 and 1411 tailgates against distance ahead of working face. - "A Coal Burst Mitigation Strategy for Tailgate during Deep Mining of Inclined Longwall Top Coal Caving Panels at Huafeng Coal Mine"

Arch structure effect of the coal gangue flow of the fully ...

Abstract Based on the characteristics of the top coal thickness of the fully mechanized caving in special thick coal seam, the long distance of coal gangue caving, as well as the different sizes of the coal gangue broken fragment dimension and spatial variation of drop flow, this paper uses laboratory dispersion simulation experiment and theoretical analysis to study the arch structure effect ...

1. Introduction

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 [4]. The main roof on the 401103 working face is formed by thick and hard sandstones, which require layer mining or fully mechanized top ...

Rule-based expert system to assess caving output ratio in ...

 · Coal mining professionals in coal mining have recognized that the assessment of top coal release rate can not only improve the recovery rate of top coal, but also improve the quality of coal. But the process was often performed using a manual-based operation mode, which intensifies workload and difficulty, and is at risk of human errors. The study designs a assessment system to give the caving ...

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 ...

Dynamic Response Analysis of the Coal Gangue-like Elastic ...

 · The impact and collision behavior between the coal gangue and the hydraulic support widely exists in the top coal caving. However, due to the complex interactions between the large number of coal gangue particles in the mining surface and the limitations of the coal mining technology and other factors, it becomes a difficult problem to study the collision behavior and the contact response ...

[PDF] Dynamic Response Analysis of the Coal Gangue-like ...

The impact and collision behavior between the coal gangue and the hydraulic support widely exists in the top coal caving. However, due to the complex interactions between the large number of coal gangue particles in the mining surface and the limitations of the coal mining technology and other factors, it becomes a difficult problem to study the collision behavior and the contact response ...

Numerical Investigation of Top-Coal Migration in the First ...

In Longwall Top-Coal Caving (LTCC), the shape of the loose body (LB) and top-coal boundary (TCB) formed after the first coal-drawing are the initial conditions for the common coal-drawing period. Taking the Panel 12309 in Wangjialing coal mine as the research object, the weight of the blocks of caved top coal was measured on-site, and the distribution of their equivalent diameter was calculated.

Frontiers | Physical Characteristics of Section Coal and ...

The determination of the section coal pillars width in a high-strength mine with a fully mechanized top-coal caving working face should consider many factors, such as repeated and intensive mining, basic roof fractures, large tunnel sections, and other shock disturbance factors [16, 17].

Coordinated Deformation Mechanism of the Top Coal and ...

 · To solve this problem, the mine pressure model and the load-bearing structure diagram of gob-side entry retaining in a fully mechanized caving face are established. Based on the elastic modulus of the filling body and top coal, the interaction relationship between the top coal and the filling body is …

Longwall Top Coal Caving Method

 · 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.

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

مرکزی صفحہ International Journal of Rock Mechanics and Mining Sciences Effect of upward angle on the drawing mechanism in longwall top-coal caving mining. International Journal of Rock Mechanics and Mining Sciences 2016 / 05 Vol. 85.

Guang Hui Xue | Scientific

Journal of Biomimetics, Biomaterials and Biomedical Engineering Materials Science. Defect and Diffusion Forum

1. Engineering Geology and Production Conditions

With the focus of national resource development and coal mining shifting to the west, steep coal seam, which accounts for more than 50% of the number of mines in the west, has become an important mining object. Typical mines are Xinjiang Wudong coal mine, Gansu Yaojie No. 3 coal mine, Gansu Huating coal mine, etc. [1 – 3]. The main types of ...

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.

Coal-Rock Recognition in Top Coal Caving Using Bimodal ...

This study employs the mechanical vibration and acoustic waves of a hydraulic support tail beam for an accurate and fast coal-rock recognition. The study proposes a diagnosis method based on bimodal deep learning and Hilbert-Huang transform. The bimodal deep neural networks (DNN) adopt bimodal learning and transfer learning. The bimodal learning method attempts to learn joint representation by ...

Study on Metal Plate Vibration Response Under Coal–Gangue ...

 · 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 plate of the shield beam or tail boom in ...

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 · Effect of face dip angle on the drawing mechanism in longwall top-coal caving mining. Journal of China University of Mining and Technology. 2018, 47(4): 805-814 (doi: 10.13247/j.cnki.jcumt.000889) (9) Wang JC, Zhang JW. BBR study of top-coal drawing law in longwall top-coal caving mining. Journal of the China Coal Society, 2015, 40(3): 487-493.

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 ...

Effect of Key Parameters on Top Coal First Caving and Roof ...

 · 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.

Dissertations / Theses: ''Paño caving'' – Grafiati

Coal-gangue interface detection during top-coal caving mining is a challenging problem. This paper proposes a new empirical approach to detect the coal-gangue interface based on vibration signal analysis of the tail boom support of the longwall mining machine.

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.

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

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 ...

Estimation of First and Periodic Roof Weighting Effect ...

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 …

Vibration Test of Single Coal Gangue Particle Directly ...

 · Abstract: In order to realize the recognition of coal gangue in the top coal caving process, a scheme of the coal gangue recognition based on the collision vibration signal between coal gangue and the metal plate is proposed in this paper, a systematic and standardized impacting test between coal gangue particles and the metal plate is designed for the first time, the vibration signal ...

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.

Coal-Gangue Interface Detection Based on Ensemble ...

 · To realize the unmanned automation of the full mechanized caving, the bottleneck problem of coal-gangue interface detection in top coal caving must be solved first. Targeting coal-gangue interface detection on fully mechanized mining face, an alternative scheme to detect coal-gangue interface based on vibration signal analysis of the tail boom support of the longwall mining …

12 Environmental Effects of Coal Mining

One of the most obvious (albeit perhaps least harmful) environmental effects of coal mining is noise pollution. Coal mining is a loud, day- and night-long process that disrupts the lives of those in the surrounding communities, reduces the quality of life and can go on for decades. #11 Loss Of Wildlife. Coal mining requires a large expanse of ...

Longwall Top Coal Caving (LTCC) technology

Yancoal introduced the Longwall Top Coal Caving (LTCC) mining technology to Australia at its Austar mine in 2006. Developed in China, top coal caving uses a modified long wall mining system. LTCC allows the excavation of thick coal seams of 5 to 12 metres at one pass of the longwall machine, generating high productivity and economic returns for ...

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

1.1 PHASES OF A MINING PROJECT

The first way in which proposed mining projects differ is the proposed method of moving or excavating the overburden. What follows are brief descriptions of the most common methods. 1.1.3.1 Open-pit mining Open-pit mining is a type of strip mining in which …

Technique of top coal caving with vibration

 · 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 …

1. Introduction

In recent years, with the continuous improvement of key technology of large mining height fully mechanized top coal caving mining in extra-thick coal seam and the rapid development of mine mechanical and electrical equipment [1, 2], the kind of mining technology characterized by large mining face, extra-thick coal seam, and rapid advance speed has been gradually developed and popularized, …