Results 21 to 30 of about 1,343,113 (227)

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

Mechanism of Support Optimization and Confined Blasting of Thick and Hard Rock with a Wedge-Structure Immediate Roof: A Case Study

Geofluids, 2021
Based on the occurrence conditions of a thick and hard main roof and wedge-structure immediate roof in the Zhuxianzhuang Coal Mine, the fracture characteristics and instability migration law of a thick and hard roof (THR) were examined via physical ...
Tong Zhao, Peilin Gong, Kaan Yetilmezsoy, Majid Bahramian, Changyou Liu, Xiaofei Gong   +5 more
doaj   +2 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

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

Mechanism and prevention of coal bursts in gob-side roadway floor under thick and hard roof in the deep mining area of Ordos

International Journal of Coal Science & Technology
The complex stress environment in deep roadways, often exacerbated by thick and hard strata, frequently precipitates coal bursts, posing significant safety hazards.
Jinlong Zhou, Junfeng Pan, Yongxue Xia, Taotao Du, Wengang Liu, Chenyang Zhang   +5 more
doaj   +2 more sources

Study on Dynamic Disaster Mechanisms of Thick Hard Roof Induced by Hydraulic Fracturing in Surface Vertical Well [PDF]

, 2022
With the increase in mining depth and the deterioration of mining conditions, thick and hard overburden movement frequently induces mine earthquakes and rock bursts.
Xiaoguang Shang, Li, Jiajie, Zhu, Chun, Sitao Zhu, Liu, Jinhai, Hitch, Michael, Zhu, Sitao, Liu, Hongliang, Jinhai Liu, Michael Hitch, Fuxing Jiang, Hongliang Liu, Jiajie Li, Shang, Xiaoguang, Jiang, Fuxing, Tang, Shibin, Shibin Tang, Chun Zhu   +17 more
core   +2 more sources

Study on the dynamic evolution characteristics of deformation and collapse of the extra-thick hard roof

矿业科学学报, 2021
Yima coal field has an extra-thick hard rock strata, which is the main cause of many dynamic disasters in the mining area. Based on the mining face 21221 of Qianqiu mine in Yima coal field, Henan Province, China, this paper studies the movement ...
Wang Hongwei, Deng Daixin, Jiang Yaodong, Shi Ruiming, Yang Guozhen, Zhang Xiaohai   +5 more
doaj   +1 more source

Analysis of overburden structure and evolution characteristics of hard roof mining in extremely thick coal seam

Meitan kexue jishu, 2023
The mining of extremely thick coal seam form a large space stope, the fracture disturbance of hard roof spreads to a wide range, the working face weighting has the characteristic of “strong mine pressure”, it is obviously different from rock burst ...
YU Bin, KUANG Tiejun, YANG Jingxuan, ZHU Weibing   +3 more
doaj   +1 more source

Development status and Prospect of directional hydraulic fracturing technology for coal mine roof [PDF]

E3S Web of Conferences, 2020
Aiming at the harm and control methods of thick and hard roof in coal mine, the paper firstly analyzes the advanced control methods of thick and hard roof, such as directional shaped charge blasting roof control technology, hydraulic fracturing roof ...
Liangwei LI
doaj   +1 more source

Pressure Control Technology at the Hard Thick Sandstone Roof in an Island Mining Face with a Large Mining Height [PDF]

, 2020
Fracture of a critical stratum on a coal seam roof may cause strong strata pressure behaviours. In particular, a large-scale sudden fracture of the critical stratum, which is formed by hard thick sandstones on a mining face with a large mining height ...
Min Tu, Tu, Min, Fu*, Baojie, Qingchong Zhao, Baojie Fu*, Zhao, Qingchong   +5 more
core   +1 more source