Results 31 to 40 of about 4,362 (258)

The breaking characteristics of thick-hard roof and determination of support capacity in fully mechanized caving face

矿业科学学报, 2016
It is difficult to determine the first roof weighting interval of hard roof on fully mechanized caving face.Based on the working face 8301 of Dongzhouyao coal mine, a model of two edges fixed in thick and hard roof was established by using energy method ...
Cheng Zhanbo, Kong Dezhong, Yang Jinghu
doaj   +1 more source

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

Shock and Vibration
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 object, the mechanical and FLAC3D numerical models of roof presplitting blasting energy release are
Xiaoqi Hao, Gang Han, Hu Liu, Jiahao Xie, Yawu Shao, Yin Zhang, Jinglong Cao, Qian Zhao   +7 more
openaire   +3 more sources

Disaster mechanism and collaborative control technology of multi-field coupling in extra-thick coal seam with hard roof [PDF]

Meitan kexue jishu
Addressing the coupled challenges of strong mine pressure and gas, induced by large-span fracture of the hard roof during the mining of thick coal seams, a systematic understanding of the disaster mechanism through multi-field coupling of the hard roof ...
Bin YU, Xiting WANG, Yang TAI, Guozhi LU, Binwei XIA, Tiejun KUANG, Bingjie HUO   +6 more
doaj   +2 more sources

Surrounding Rock Control Technology of Thick Hard Roof and Hard Coal Seam Roadway under Tectonic Stress

Processes
In the process of roadway excavation in thick and hard coal seams with a hard roof, the instantaneous release of a large amount of elastic energy accumulated in coal and rock mass causes disasters. Especially under the action of tectonic stress, dynamic disasters of roadway-surrounding rock are extremely strong.
Zhongzong Cao, Honglin Liu, Chengfang Shan, Hongzhi Wang, Haitong Kang   +4 more
openaire   +2 more sources

Applications of Advanced Presplitting Blasting Technology in the Thick and Hard Roofs of an Extra-Thick Coal Seam

Processes
Based on the engineering conditions of the 1303 working face in Zhaoxian Coal Mine, this study investigates the characteristics of mine pressure behavior and the stress-relief mechanism of advanced presplit blasting in a working face with a thick and hard roof in an extra-thick coal seam.
Shouguo Wang, Kai Zhang, Bin Qiao, Shaoze Liu, Junpeng An, Yingming Li, Shunjie Huang   +6 more
openaire   +2 more sources

Synergistic reinforcement using pressure releasing and energy absorbing method under hard roof: Physical model test

Journal of Rock Mechanics and Geotechnical Engineering
During fully mechanized caving mining of thick coal seams, a large amount of strain energy accumulates in the roof, especially when the roof is thick and hard, making it difficult for the roof to collapse naturally.
Qi Wang, Jiting Liu, Bei Jiang, Zhenhua Jiang, Yusong Deng, Chuanjie Xu   +5 more
doaj   +2 more sources

Fracture Instability Law of Thick Hard Direct Covering Roof and Fracturing and Releasing Promotion Technology

Applied Sciences
Because of its strong bearing capacity and large size, a thick and hard roof is the main source of strong ground pressure in a stope, and its breaking and migration mechanism and effective control are very important for realizing safe and efficient ...
Xingping Lai, Chuan Ai, Helong Gu, Hao Wang, Chong Jia   +4 more
doaj   +2 more sources

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

Meikuang Anquan
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 roadway with thick and hard roof is mainly divided into deformation instability and impact instability ...
Huijie BI, Yunlong MO, Shaogang LI
openaire   +3 more sources

Determination and Application of the Unsupported Roof Distance in Coal Roadway Driving With the Thick and Hard Main Roof [PDF]

, 2020
Abstract The authors have requested that this preprint be removed from Research Square.
Yang Sen, Hua Xin Zhu, Yang Peng, Liu Xiao, Li Chen, Wang En Qian   +5 more
openaire   +3 more sources

Ground fracturing pre-control technology for potential mine seismic risk of thick and hard roof

Meitan kexue jishu, 2023
Mines with thick and hard roof face high risks of mine seismic activities and mine pressure during mining, which easily leads to dynamic disasters in mines.
Shuwen WANG, Baoyan ZHI, Taotao DU, Guangyu YANG, Chuang LU, Yongxue XIA   +5 more
doaj   +1 more source