Results 61 to 70 of about 4,010 (144)

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

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  

In Situ Studies on the Characteristics of Strata Structures and Behaviors in Mining of a Thick Coal Seam with Hard Roofs

Energies, 2018
The movements of overburden induced by mining a thick coal seam with a hard roof extend widely. The effects of breakages in the hard strata on the strata behaviors might vary with the overlying strata layers.
Yiwen Lan, Rui Gao, Bin Yu, Xiangbin Meng   +3 more
doaj   +1 more source

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   +1 more source

Three-dimensional collaborative hydraulic fracturing control for thick hard roofs: mechanism, simulation, and field application in Yadian Coal Mine

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
Thick hard roof with high strength, large breaking step and strong mine pressure is one of the major problems in coal mine safety production. Aiming at the problems of large thickness, high strength and difficult collapse of the roof slab of Yadian Coal ...
Shuo Ren, Xuehua Li, Shun Liang, Jie He, Zhongwei Li, Changru Li, Hongye Luo   +6 more
doaj   +1 more source

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

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   +1 more source

Application of Long-Distance Drilling and Blasting Technology to Prevent Rock Bursts in High-Level Roofs

Applied Sciences
In view of the high-level, thick, and hard roof in a mine in Shaanxi, it is difficult for existing technology to solve the problem of frequent rock bursts, which are caused by the direct weakening of the whole underground layer.
Qianyue Gu, Anye Cao, Weiwei Zhao, Yao Yang, Chengchun Xue, Qi Hao   +5 more
doaj   +1 more source

Mechanism and control of deformation in mining roadways with hard roofs in extra-thick coal seams

Frontiers in Materials
Introduction The mining roadways for the exceptionally thick coal seams 3-5 at Tashan Colliery in the Datong Mining District faced the challenge of significant and uncontrollable surrounding rock deformation under hard roof strata conditions, posing a serious threat to safe and efficient operations.
Wen-Zhe Gu, Bei-Yan Zhang, Cheng-Yong Liu, Chao-Feng Yuan, Yan-Bin Yang, Wen-Tao Liu, Xin-Fu Zhang, Heng-Jian Qiu   +7 more
openaire   +1 more source

Research and Application of Directional Fracturing Roof Cutting for Lateral Thick and Hard Roofs in Shallow-Buried Large-Section Roadways

Abstract Aimed at the severe strata behavior hazards caused by the occurrence of lateral thick and hard roofs in shallow-buried large-section roadways, a directional fracturing and roof cutting technology for lateral thick and hard roof zones in shallow-buried large-section coal mine roadways is proposed. Key technologies of directional
Yu Wang, Yanjun Feng, Kaikai Zhao
openaire   +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   +2 more sources