Study on distribution law of lead abutment pressure in fully mechanized caving face with large mining height

2014 ◽  
pp. 389-394
Author(s):  
Fu-Lian He ◽  
Zhi-Yang Liu ◽  
Tong-Da Li ◽  
Sheng-Rong Xie ◽  
Huan-Kai Wu ◽  
...  
Keyword(s):  
Abutment Pressure ◽  
Distribution Law ◽  
Large Mining Height ◽  
Mining Height

Study on Distribution Laws of Abutment Pressure for Fully-Mechanized Top-Coal Caving Face in Deep and Large Mining Height

2013 ◽  
Vol 746 ◽  
pp. 496-500
Author(s):  
De Chao Lu ◽  
Xiao Liu ◽  
Xiao Chen Liang ◽  
Yue Gao
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Field Measurement ◽  
Concentration Factor ◽  
Abutment Pressure ◽  
Prevention And Treatment ◽  
Coal Wall ◽  
Large Mining Height ◽  
Distribution Laws ◽  
Mining Height

Based on the geologic and technology condition of 2301 fully-mechanized top-coal caving and large mining height face in Longgu colliery, the paper have comprehensive studied distribution laws of abutment pressure by theoretical analysis, FLAC3D numerical simulation and field measurement. The study draws the trend and inclination distribution range and value and concentration factor of the peak, which of these were impacted by mining height and depth and advance distance, and reveals distribution laws of abutment pressure with face advancing, and also pointed out that laws was in favor of top-coal caving, but not conductive to the prevention and treatment of the rib fall of coal wall; field measurement and numerical simulation and theoretical analysis results can be achieved mainly unified.

Numerical Simulation of Strata Behavior in Super-Long and Large Mining Height Working Face

2013 ◽  
Vol 634-638 ◽  
pp. 3428-3432 ◽  
Author(s):  
Zhi Hua Li ◽  
Xin Zhu Hua ◽  
Ruo Jun Zhu ◽  
De Sheng Zhou
Keyword(s):  
Abutment Pressure ◽  
Roof Displacement ◽  
Mining Depth ◽  
Working Face ◽  
Face Length ◽  
Coal Wall ◽  
Large Mining Height ◽  
Strata Behavior ◽  
Behavior Characteristics ◽  
Mining Height

In order to study the strata behavior characteristics in super-long and large mining height working face, the FLAC-3D software was used to study the roof displacement and the abutment pressure distribution laws of working faces. The results indicate that: ① the influence range is larger of front abutment pressure in Liuzhuang coal mine 171301 super-long large mining height working face, and reaches to 60m. ② the maximum roof displacement increases with the increase of mining depth and working face length, the increase in magnitude decreases gradually, while the maximum roof displacement sharply increases due to the increase of mining height. ③ the peak abutment pressure increases with the increase of mining depth and mining height, the location of peak abutment pressure transfer to ahead of the coal wall. ④ the effect of working face length on abutment pressure is very feeble, so, the strata behavior characteristics remain almost constant with the increase of face length.

scholarly journals The Effect of Joint Damage on a Coal Wall and the Influence of Joints on the Abutment Pressure on a Fully Mechanised Working Face with Large Mining Height

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Weibin Guo ◽  
Shengwei Zhang ◽  
Yuhui Li
Keyword(s):  
Abutment Pressure ◽  
Limit Equilibrium ◽  
Technical Problem ◽  
Damage Variable ◽  
Joint Spacing ◽  
Working Face ◽  
Coal Wall ◽  
Large Mining Height ◽  
Dip Angle ◽  
Mining Height

Coal wall spalling is regarded as a key technical problem influencing safe and efficient mining of large-mining-height working faces while the distribution of abutment pressure within the limit equilibrium zone (LEZ) influences coal wall spalling within a large-mining-height working face. This research attempted to explore the distribution characteristics of abutment pressure within the LEZ in a large-mining-height working face. For this purpose, the influences of the orientation of joints on mechanical characteristics of coal with joints and on the distribution of abutment pressure within the LEZ in the large-mining-height working face were analysed by theoretical analysis and numerical simulation. Research results show that the damage variable of coal with joints first rises, then decreases, and finally increases with increasing dip angle of the joints; as the azimuth of the joints increases, the damage variable first declines, then increases; the damage variable gradually declines with increasing joint spacing; an increase in the dip angle of joints corresponds to first reduction, then growth, and a final decrease of the abutment pressure at the same position in front of the coal walls; on certain conditions, the abutment pressure at the same position within the LEZ first rises, then declines as the azimuth of joints increases; with the growth of the joint spacing, the abutment pressure at the same position within the LEZ rises. The dip angle and azimuth of joints marginally affect the abutment pressure within the LEZ.

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.

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