Abstract A better understanding of the interaction between shield supports, roof, and coal strata, along with the prediction of roof deformation and caving behavior is essential for successful longwall mining operations. The stability of a longwall face ...
Reviewing the 25 year history of the use of the shield support for longwall mining in the United States, it is clear that the shield had a major role in making longwall mining the …
Semantic Scholar extracted view of "Numerical Modeling Study of the Effect of Some Critical Parameters on Caving Behavior of Strata and Support Performance in a Longwall Working" by G. S. Singh et al. ... panels enhances safety in longwall mining. This paper presents the results ... for the utilization of high-capacity shield support …
The shield support was used for coal mining began from 1970 in China. In the last 30 years, the shield support is widely used in coal mines. The 4-leg shield support ( Fig.7 (a)) was used in the ...
The modern longwall mining method was first developed in the early 1970s when the first shield supports were introduced. Since that time, all components of a longwall system have been considerably upgraded in areas such as installed power, conveyor chain speed and capacity, structural integrity, and — first and foremost — automation.
DOI: 10.1016/J.IJRMMS.2009.09.001 Corpus ID: 108910117; Prediction of caving behavior of strata and optimum rating of hydraulic powered support for longwall workings @article{Singh2010PredictionOC, title={Prediction of caving behavior of strata and optimum rating of hydraulic powered support for longwall workings}, author={G. S. P. …
Developing longwall mining under weak geological conditions imposes a substantial challenge with regard to the higher risk of falling roofs. Maintaining the stability of the longwall face in this ...
Based on the drive space, a kinematic model using the Denavit–Hartenberg theory based on drive space was developed to predict the position information of the …
Transcription . behavior of shield support in longwall mining - ethesis
Failure of longwall projects in India is attributed to many factors, one among them is the selection of under-rated capacity of powered support. It is evident with the catastrophic failures at longwall project of Kothadih in 1997, Charcha west in 1989 and Dhemomen in 1998 or increase in the existing capacity of the powered support at …
The most significant improvement in powered support design has been the shield support, which improved kinematic stability and promoted the application of …
The success of longwall mining depends to a large extent on the capacity and design of shield support. Throughout the history of longwall mining, shield support design has been a critical issue to the success of mining operation. To make mining operations …
DOI: 10.1061/ijgnai.gmeng-8144 Corpus ID: 258753472; Real-Time Shield Pressure Analysis for the Evaluation of Roof Behavior in Longwall Panels @article{Bhandari2023RealTimeSP, title={Real-Time Shield Pressure Analysis for the Evaluation of Roof Behavior in Longwall Panels}, author={Tushar Bhandari and …
Assessment of longwall roof behavior and support loading by linear elastic modeling of the support structure, (Bureau of Mines report of investigations; 9081) Bibliography, SupL of Docs, no,: 1 28.23;9081, 1. Longwall minlng-Mathematical models. 2. Elastic analysis (Theory of structures). I. Burton, W. Scotl. Title. III.
The length of the roof support beam is 5.2 m, and the length of hanging roof is 1.5 m. By obtaining the stiffness conditions of the face-end support, the conditions of the roof deflection are as shown in Figure 5; the supporting force of the longwall mining hydraulic support group is shown in Figure 6.
Peng, S.S. and Chiang, H.S. (1982a) Support resistance and roof behaviour of a longwall face with 4-leg shields, inProceedings, 2nd Conference on Ground Control in Mining, West ia University, pp. 53–62.. Peng, S.S. and Chiang, H.S. (1982b) Roof stability in longwall coal faces, inProceedings, First International Conference on Stability in …
supports in Eastern mines and Burrell Mining Products introduced the Can support in Western mines. Since then, there has been a dramatic increase in new roof support technologies for longwall gateroad support. Historically, standing support, including shield supports, have been designed based on a simplistic model requiring
Ground controls in roadways and longwall faces are the hot topics in deep mining, as shown in Fig. 1pared with shallow coal mines, deep coal mines suffer high in situ stress and strong mining disturbance, resulting in large deformation, long duration, and serious damage to the roadways (Adams and Rennison, 2003; Hucke et al., 2006; …
A number of mechanical models of longwall face stability were developed in previous analytical studies. Frith [] proposed a conceptual model that was composed of a vertically cleated coal seam, a horizontally bedded immediate roof loaded by overburden strata, and shield support (Fig. 1).Based on the theory of Euler buckling (in particular, …
Roof strata movement and shield pressure are two important factors that affect the production and efficiency of longwall top coal caving (LTCC) method in extra-thick coal seams. The performances of these two aspects can be very different from one mine to another depending on the roof strata conditions. In this paper, the geological …
In the Longwall mining method, the coal face is being supported with two-legged or four-legged shield supports which improve better roof control between the face and canopy tip. The development of ...
Introduction. Longwall is a globally proven mass mining technology for underground coal mining. The complex rock mechanics issues involved in this inflexible mining system demands careful planning for selection of suitable mining sites, and rational capacity support systems to ensure successful implementation of the project in a given …
mechanics governing shield behavior and will assist both coal operators and researchers in evaluating shield behav ior from performance tests. The shield mechanics described in this report have been verified by full-scale testing of two, typical, two-legged longwall shields of different manufacture in the MRS.
The stability of the roof in coal mining plays a crucial role in ensuring safe excavation. After coal extraction, the roof experiences complex and unbalanced stress conditions, leading to diverse roof failure behaviors, particularly in the case of thick roofs. This study examines the failure behaviors of roofs with different thicknesses through a …
The goal is to maintain support stability and roof support capability as convergence inevitably continues. With this background, this paper will evaluate the "bigger-is-better" …
The success of longwall mining can largely be traced to the development of powered roof support systems. The most significant improvement in powered support design has been the shield support, which improved kinematic stability and promoted the application of longwall mining in difficult-to-control caving conditions where chock and …
Developing longwall mining under weak geological conditions imposes a substantial challenge with regard to the higher risk of falling roofs. Maintaining the stability of the longwall face in this aforementioned condition is crucial for smooth operation. Investigating roof conditions in longwall requires detailed study of rock behavior in …
In longwall mining, shield support goes through the loading cycle during each retreating step for the longwall face. Shield resistance force is set at a certain value during the stage before web which is also …
Chock shields supports always have 4 hydraulic legs and all 4 legs are connected to the canopy of the support. The legs of a chock shield support are either vertical or inclined but the majority of chock shields have inclined legs as this provides better support pressure to the canopy. The main features of chock shield supports are:
This paper presents the results of lab-simulated tests on longwall powered supports under dynamic loading conditions. The tests were carried out on a test site, where the tested prop was subjected to a dynamic load using a controlled mass falling under gravity onto the support. The loading on the support was therefore determined based …
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