Results 21 to 30 of about 16,961 (284)

Disaster treatment and multisource monitoring of rockbursts in isolated island coal face under hard roof conditions. [PDF]

Sci Rep
Rockbursts are common dynamic phenomena in coal mining and have become a prominent topic in the mining industry. This study examines the isolated island coal face in an extra-thick, fully mechanized top-coal caving operation in deep burial conditions ...
Yun M, Ren J, Zhang L, Guo F, Chen X.
europepmc   +2 more sources

Study on the Application of Gob-Side Entry Retaining via Roof Cutting under the Condition of a Hard Thick Roof

Geofluids, 2022
To solve the problem of instability and failure of a roadway in the Dianping coal mine working face under the condition of traditional gob-side entry retaining, a mechanical model was established for analysis. The reasons for the damage are as follows: (1) the mining height is high, and the hard thick old roof exhibits large space for rotation and ...
Daoyong Zhu, Huyue Zhang, Yi Su
openaire   +3 more sources

Directional hydraulic fracturing to control hard-roof rockburst in coal mines

International Journal of Mining Science and Technology, 2012
Abstract Hard roof is the main factor that induces rock-burst. In view of the present obvious weakness of control measures for hard roof rockburst in domestic collieries, the mechanism and field application of directional hydraulic fracturing technology for rock-burst prevention have been investigated in this paper using theoretical analysis and ...
Linming Dou, Hu He
exaly   +2 more sources

Key Parameters of the Roof Cutting and Pressure Relief Technology in the Pre-Splitting Blasting of a Hard Roof in Guqiao Coal Mine

Applied Sciences
The phenomenon of crushing the support of the hard roof of a coal seam occurs occasionally during the coal mining process. However, making the hard roof fall is difficult due to its good integrity and high strength.
Hanlin You, Zegong Liu
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

Numerical simulation study on the mining pressure law and collaborative failure of soft-hard interlayer working face [PDF]

Scientific Reports
Aiming at the problem that the roof of the soft-hard interbedded coal seam is prone to delamination and caving without warning during coal mining, taking the No.
Zhiyuan Hou, Hao Li, Gang Liu, Kai Xie, Pan Wu, Zhitao Yang   +5 more
doaj   +2 more sources

Experimental study on the strain energy evolution mechanism of thick and hard sandstone roof in Xinjiang Mining Area

Heliyon
For understanding the mechanical performance and strain energy evolution mechanism of thick hard roof sandstone samples, a sequence of uniaxial compression trials with acoustic emission (AE) monitoring were carried out.
Dongdong Qin, Zechao Chang, Ze Xia
doaj   +2 more sources

Study on the Tensile Failure Characteristics and Energy Calculation Model of Coal Seam Hard Roof Considering the Mining Speed

Applied Sciences
To reveal the influence mechanism of mining speed on roof fracture-type rockburst, the Brazilian split technique combined with acoustic emission monitoring technology was employed to study the effects of loading rates on the tensile failure ...
Wenlong Li, Shihao Tu, Tongbin Zhao
doaj   +2 more sources

Combined blasting for protection of gob-side roadway with thick and hard roof

Journal of Rock Mechanics and Geotechnical Engineering
The deformation control of surrounding rock in gob−side roadway with thick and hard roof poses a significant challenge to the safety and efficiency of coal mining. To address this issue, a novel approach combining directional and non-directional blasting
Hongxu Song
exaly   +2 more sources

Mining-Induced Stress and Ground Pressure Behavior Characteristics in Mining a Thick Coal Seam With Hard Roofs

Frontiers in Earth Science, 2022
The hard roof of coal mines has the characteristics of high hardness, good integrity, and large layer thickness, which leads to many ground control problems.
Zhijie Zhu, Zhijie Zhu, Yunlong Wu, Zhuang Liang   +3 more
doaj   +1 more source