Results 21 to 30 of about 664 (89)

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

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

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

Safety and high-recovery mechanisms and application research for initial mining of thick-coal-seam with complex structure and thick-hard roof

Scientific Reports
Thick-coal-seam with complex structures and thick-hard roof in the initial mining phase pose various challenges, including a long weighting interval, strong rock pressure, poor top coal caving performance (TCCP), and significant coal loss. These problems
Zechao Chang, Xufeng Wang, Dongdong Qin, Jinzhu Yu, Xuyang Chen, Jiyao Wang, Zhijun Niu, Chenlong Qian   +7 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

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

The Breaking Span of Thick and Hard Roof Based on the Thick Plate Theory and Strain Energy Distribution Characteristics of Coal Seam and Its Application [PDF]

, 2017
In mining engineering, the thick and hard roof threatens the safe production. Based on Reissner plate theory and combined with weighted residual method, with four edges clamped as the boundary conditions, this paper deduces the theoretical formula of the
Xiaolong Li, Changwu Liu, Yang Liu, Hui Xie   +3 more
core   +1 more source

Mechanical Analysis of the First Fracture Characteristics of Hard Roof of Extra-thick Coal Seam

Meikuang Anquan, 2020
In order to investigate the failure mechanisms of the hard roof in the fully mechanized caving face in the extra-thick coal seam, the mechanical analysis model of the first breaking of the hard top roof in the fully mechanized caving mining of the extra-
LIANG Shaping, LU Yinlong, GUO Peng, WU Bingzhen
doaj   +1 more source