Results 71 to 80 of about 664 (89)

Research and Application of Rockburst Prevention Technology in the Return Airway with Deep Thick Hard Sandstone Roof

To address the issue of rockburst in deep return airways caused by thick, hard sandstone roofs in the Hulusu Coal Mine, this study proposes a deep borehole pressure relief technique based on hydraulic fracturing.
Yaozu Ni, Zhixiang Song, Zhensuo Wang, Pengxin Zhang, Yongli Liu   +4 more
core   +1 more source

Research on blasting technology for thick and hard roof fracturing in isolated island coal mine working face

In order to study the prevention and control technology for hard roof type coal burst in the isolated working face of the Chenjiashan coal mine, the 418 isolated working face was selected as the engineering case study.
Shuai Wang, Leilei Zhao, Gang Jing, Wei Huang, Liqiang Ma   +4 more
core   +1 more source

Effect of Thick–Hard Main Roof Fracturing on the Spatiotemporal Evolution of Overburden Fractures

Gas gushing and the co-mining of coal and gas outbursts are common disasters in coal mines. The weakening of thick–hard main roof fracturing can effectively alleviate the gas overrun in the initial mining stage.
Jinfeng Ju, Zhu Li, Chengen Qi
core   +1 more source

Mechanisms of Thick-Hard Roof and Thin Aquifer Zone Floor Destruction and the Evolution Law of Water Inrush

The collapse of thick-hard roofs after coal has been extracted is not a consequential process in all cases. Rather, it happens due to the augmentation of high stress conducted at depth, followed by a wider range of damage as the floor cracks.
Xu Wang, Shuqian Li, Shangxian Yin, Min Cao   +3 more
core   +1 more source

Rock bursts induced by thick-hard roof with compound key strata: Mechanisms and technical modes for prevention

Objective Thick-hard roofs serve as the key factor inducing disasters such as rock bursts and mining-induced earthquakes in coal mines. These disasters are especially serious in the case of coal seam roofs with compound key strata.
Pingsong, ZHANG, Lintao, WANG, Liang, YUAN, Kaige, ZHENG   +3 more
core   +1 more source

Research on the Key Technology of Gob-Side Entry Retaining by Roof Cutting for Thick and Hard Sandstone Roofs

Sustainability, 2022
In order to ensure the application of gob-side entry retaining by roof cutting for thick and hard sandstone roofs, the key technology of pre-split blasting was studied.
Chaowen Hu, Eryu Wang, Yongyuan Li
exaly   +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

A Case Study of Effective Support Working Resistance and Roof Support Technology in Thick Seam Fully-Mechanized Face Mining with Hard Roof Conditions

Sustainability, 2017
This paper presents the engineering geological properties and roof control tecnology for a thick coal seam fully-mechanized face mining with hard roof conditions (THC) at the Jinhuagong Coal Mine (JCM), northwest China.
Guowei Dong, Hong-sheng Wang, Weibin GUO
exaly   +2 more sources

Research on the Reasonable Width of Coal Pillar Driving along Goaf under Thick Hard Roof

Applied Sciences (Switzerland)
There are fewer studies on the width of coal pillar retaining under a thick, hard roof. This paper takes the thick limestone roof in the 10110 working face of Jinniu Coal Mine as the background, taking the reasonable coal pillar width and its stability ...
Zhenfei Han, Dalong Xu, Wei Gu, Hao Zhang   +3 more
exaly   +2 more sources

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Ground Control Method of Using Roof Cutting Pressure Release and Energy-Absorbing Reinforcement for Roadway with Extra-Thick Hard Roof

Rock Mechanics and Rock Engineering, 2023
Bei Jiang, Manchao He
exaly