Results 51 to 60 of about 664 (89)

Mine earthquake prevention and control through ground fracturing in deep multi-layered thick roof

Meitan kexue jishu
The presence of multilayered thick and hard roof strata results in frequent mine tremors, significantly complicating prevention and control efforts and posing a formidable challenge to the safe and efficient operation of coal mines.Taking the multi-layer
Jianhong WU, Yongxue XIA, Taotao DU, Gang XU, Xufeng QIN, Jiaming GAO, Yanfei ZHU, Xuehui CHEN, Jinlong ZHOU   +8 more
doaj   +1 more source

Practice of deep hole blasting and rapid charging technology for composite thick and hard roof [PDF]

In order to control the dynamic pressure behavior of the working face under the condition of composite thick and hard roof, taking a mine in Ordos as an example, through theoretical analysis, it is clarified that the instability of small coal pillar ...
Huijie BI, Shaogang LI, Yunlong MO
core   +1 more source

Disaster mechanism of thick-hard roof and control technology by hydraulic fracture with directional long borehole

Meitan kexue jishu
In response to the main technical challenges faced by coal production enterprises in the long-term prevention and control of disasters caused by the thick-hard hanging roof fracturing in longwall mining faces, taking the 8238 fully-mechanized top-caving ...
Zhaozhong LI, Rui WANG
doaj   +1 more source

Study on Roof Breakage-Induced Roadway Coal Burst in an Extrathick Steeply Inclined Coal Seam

Shock and Vibration, 2019
In view of the coal burst induced by roof breakage in the steeply inclined coal seam (SICS) roadway and its mechanism, a mechanical model was established to investigate the distribution of dynamic and static stresses in the coal seam before and after the
Sheng-chuan Wang, Lin-ming Dou, Zong-long Mu, Jin-rong Cao, Xu-wei Li   +4 more
doaj   +1 more source

Study on anti-impact effect of hydraulic fracturing for long holes in medium and high thick hard roof

, 2023
In view of the insufficient pressure relief effect of thick hard roof of 3106 working face in Menkeqing Coal Mine, the key layer inducing roof shock of 3106 working face was determined by the active strata of micro-seismic high-energy events monitored in
SUN Ruda, XIA Yongxue, GAO Jiaming
core   +1 more source

Strong mine pressure appearing mechanism and control at deep buried working face with large mining height

Meitan kexue jishu
During the mining of the adjacent working face, the strong mine pressure caused by the hard thick roof has obvious zoning characteristics due to the mining of the previous deeply buried large mining height working face.
Zhaoyuan LEI, Maoping ZHAO, Tuanjie LI, Feng LI, Lei LI   +4 more
doaj   +1 more source

Research Anti-Impact Mechanism of Roof Presplitting Blasting in Deep Composite Thick and Hard Key Strata

As an important means to control the hard roof, presplitting blasting is the main measure for controlling rock burst disaster in the key strata of the deep mine in the west. Taking the typical thick and hard key layer, Menkeqing Coal Mine as the analysis
Jiahao Xie, Jinglong Cao, Qian Zhao, Gang Han, Hu Liu, Yin Zhang, Xiaoqi Hao, Yawu Shao   +7 more
core   +1 more source

Study on fracture law and energy evolution characteristics of inclined thick-hard roof

Meikuang Anquan
Fracture of the inclined thick-hard roof structure is the direct cause of dynamic disasters such as rock burst. To clarify the fracture law and energy evolution characteristics of the inclined thick-hard roof, taking the 1303 working face with inclined ...
Jinliang ZHANG, Weiping SHI, Shouqing YAN, Guohui WANG, Lei HOU, Jie GUO, Qiongxiang TIAN, Chenshuo ZHANG   +7 more
doaj   +1 more source

Characteristics and mechanism of strong dynamic load mine pressure in large mining height full-mechanized caving face with multiple thick and hard roof

Meitan xuebao
In view of the problems of strong mine pressure such as rapid shrinkage of hydraulic support column and easy support crushing in working face under the fully mechanized caving face with large mining height in multi-layer thick and hard roof of extra ...
Zhen ZHANG, Zhizeng HUANG, GANG XU, Xiaogang LIU, Qianjin LIU, Tielin ZHAO, Xingyu LIN   +6 more
doaj   +1 more source

Ground control strategies for longwall top-coal caving panel in extra-thick coal seams with thick-hard roof

Scientific Reports
Thick-hard roof fracturing presents a significant challenge for disaster prevention in longwall mining. This study investigates the 15,311 south working face and develops a mechanical model to analyze energy release during both initial and cyclic roof ...
Rui Wang, Wei-guang Zhang, Hao-sen Wang, Zai-jiang Yu, Qiang Zhang   +4 more
doaj   +1 more source