Design of Debris Shield of Powered Support with 6.2M Large Mining Height

2010 ◽  
Vol 44-47 ◽  
pp. 1246-1250
Author(s):  
Jing Chen ◽  
Shao Xiang Hao ◽  
Xun Fan
Keyword(s):  
Mechanical Model ◽  
Mechanical Characteristics ◽  
General Structure ◽  
Mining Industry ◽  
Overall Design ◽  
Powered Support ◽  
Large Mining Height ◽  
Force Calculation ◽  
Mining Height

One of the difficulties of the world’s mining industry is how to ensure safe and reliable work of the powered support with large mining height more than 6m. The paper introduces the design and calculation of debris shield of the powered shield support with 6.2M large mining height. In this paper, first mechanical model of powered support with large mining height was established, the mechanical characteristics of powered support was analyzed, and overall design of powered support and general structure of debris shield could be done according to the force calculation.

DESIGN AND OPTIMIZATION OF DEBRIS SHIELD OF POWERED SHIELD SUPPORT WITH LARGE MINING HEIGHT

2011 ◽  
Vol 10 (01) ◽  
pp. 143-149
Author(s):  
JING CHEN ◽  
SHAOXIANG HAO ◽  
XUN FAN
Keyword(s):  
Stress Concentration ◽  
Maximum Stress ◽  
Mining Industry ◽  
Good Effect ◽  
The Finite Element Method ◽  
Design And Optimization ◽  
Structural Improvement ◽  
Powered Support ◽  
Large Mining Height ◽  
Mining Height

One of the difficulties of the world's mining industry is how to ensure safe and reliable work of the powered support with large mining height of more than 6 m. In this paper, first mechanical model of powered support with large mining height was established, the mechanical characteristics of powered support was analyzed, and the stress analysis and preliminary design was made for the debris shield of the powered support. Then the whole 3D model of powered support with large mining height was established based on computer-aid design (CAD), and the finite element method (using the software ANSYS®) was used to analyze and calculate the stress according to the new inspection standard of MT312-2000. It is found that there is too large stress and obvious stress concentration in the debris shield of powered support. Through the structural improvement of debris shield, the maximum stress value of the debris shield was greatly reduced, the stress concentration was greatly improved, and the intensity optimization was achieved. This ensures the reliability of the powered support with large mining height. Improved debris shield demonstrates a good effect in practical use.

Failure analysis of super-large mining height powered support

2018 ◽  
Vol 92 ◽  
pp. 378-391 ◽  
Author(s):  
Zhaosheng Meng ◽  
Qingliang Zeng ◽  
Kuidong Gao ◽  
Shuai Kong ◽  
Peng Liu ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Powered Support ◽  
Large Mining Height ◽  
Mining Height

Study on rib spalling control of shortwall drilling mining technology with a large mining height

2021 ◽  
Vol 14 (3) ◽  
Author(s):  
Yong Yuan ◽  
Cheng Zhu ◽  
Hongmin Wei ◽  
Chaofeng Yuan ◽  
Zhongshun Chen
Keyword(s):  
Mining Technology ◽  
Large Mining Height ◽  
Mining Height

scholarly journals Study on Fracture and Stress Evolution Characteristics of Ultra-Thick Hard Sandstone Roof in the Fully Mechanized Mining Face with Large Mining Height: A Case Study of Xiaojihan Coal Mine in Western China

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Feng Ju ◽  
Meng Xiao ◽  
Zequan He ◽  
Pai Ning ◽  
Peng Huang
Keyword(s):  
High Strength ◽  
Western China ◽  
Stress Evolution ◽  
Working Face ◽  
Mining Condition ◽  
Evolution Characteristics ◽  
Large Mining Height ◽  
Evolution Laws ◽  
Mining Face ◽  
Mining Height

Ultra-thick hard sandstone roofs present high thickness, poor delamination, and wide caving range. The strata pressure of the working face during actual mining increases, having a significant influence on the safe mining of the working face. Especially, in the mining areas of western China, the fully mechanized mining faces with high mining height and high-strength mining are more prominent. Understanding the fractures and stress evolution characteristics of the ultra-thick hard sandstone roof during actual mining is of high significance to control the dynamic pressure on the working face. In this paper, the typical ultra-thick hard sandstone roof of the Xiaojihan coal mine was taken as an example. The structural and chemical composition characteristics were analyzed. Besides, the fracture characteristics of ultra-thick hard roof during the working face mining were analyzed. Moreover, the fracture structure consistency was verified through physical simulation and a field measurement method. Finally, the stress evolution laws in the ultra-thick hard sandstone roof fracture were studied through numerical simulation. The findings demonstrated that (1) the ultra-thick hard sandstone roof was composed of inlaid coarse minerals, which had compact structure, while the Protodyakonov hardness reached up to 3.07; (2) under the high-strength mining condition of fully mechanized mining face with large mining height, the ultra-thick hard sandstone roof had the characteristics of brittle fracture, with a caving span of 12 m; (3) under the high-strength mining condition of fully mechanized mining face with large mining height, the ultra-thick hard sandstone roof followed the stress evolution laws that were more sensitive to the neighboring goaf. Therefore, it was necessary to reduce the fracture span or layering of ultra-thick hard sandstone roof through the manual intervention method adoption or increase either the strength of coal pillar or supporting body, to resist the impact generated during ultra-thick hard sandstone roof fracture.

scholarly journals Determination of Optimal Extrication Location of High Extraction Roadway of Large-Mining-Height Fully Mechanized Face

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Xue-bo Zhang ◽  
Ming Yang
Keyword(s):  
Gas Extraction ◽  
Horizontal Distance ◽  
High Position ◽  
Working Face ◽  
Extraction Site ◽  
Large Mining Height ◽  
Porosity And Permeability ◽  
Permeability Distribution ◽  
Mining Height

Determining the optimal extrication location of the high extraction roadway can improve the gas extrication effect of highly gassy mine and solve the problem of gas concentration overrun at the upper corner, which is of great significance to safety and efficient mine production. According to the actual situation of mine, the gas gushing amount in the goaf, pressure difference at both ends of the working face, the 3D porosity, and permeability distribution of the caving zone and fissure zone were obtained by field measurement and numerical calculation. Through theoretical calculation, the proper extraction site of a high-position alley was determined. On this basis, the optimal extraction site of a high-position alley was determined by numerical analysis of the gas extraction effect at different sites. The results show that as the perpendicular distance between high-position alley and goaf floor increases, the gas extraction amount increases first and then decreases. The concentration of extraction gas gradually increases, and the increasing trend is gradually diminished. With the increase of the horizontal distance between the air return way and the high-position alley, the gas extraction amount and gas extraction concentration increase first and then decrease. The optimal extraction site of a high-position alley should be 39 m vertically away from the goaf floor and 30 m horizontally away from the air return way.

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