Results 61 to 70 of about 1,626 (149)

Study on roof-cutting pressure relief technology for roadways with three-directional free surfaces and full anchor-cable support

Gong-kuang zidonghua
Current studies on surrounding rock control in dynamic pressure roadways mainly focus on roadways under single- or two-directional free-surface conditions, while relatively few studies have applied the combined control technology of roof-cutting pressure
NIU Jizhan, YANG Zhanbiao, LIU Benteng, WANG Xiangyu, XIE Han, XU Changtao   +5 more
doaj   +1 more source

Fracture Evolution between Blasting Roof Cutting Holes in a Mining Stress Environment

, 2022
The problem of strong ground pressure caused by thick and hard roofs in coal mine stopes has become more prominent. Blasting roof cutting and pressure relief are effective technical ways to solve this engineering problem.
Min Tu, Gaoming Zhao, Jiaxin Dang, Qingwei Bu, Xiangyang Zhang   +4 more
core   +1 more source

Research and application of breaking length of lateral cantilever roof cutting in goaf

Meikuang Anquan, 2023
The goaf at the side of the roadway pillar (lateral roof) often encounters thick and hard roof, which will not collapse naturally in a short period of time, and is easy to cause mine earthquake and roof fall.
Gaoming ZHAO, Min TU, Xiangyang ZHANG, Qingwei BU, Qingchong ZHAO, Jiaxin DANG   +5 more
doaj   +1 more source

Study on the overburden failure law in thin coal seam mining without coal pillars under complex geological conditions

Energy Exploration & Exploitation
To improve the recovery rate of thin coal seams under complex geological conditions and to investigate overburden failure and migration during pillarless mining, a study was conducted at a fully mechanized coal mining face in the Yuwang Coal Mine.
Jing Li, Lei Wang
doaj   +1 more source

Determination of the Pressure-Relief Environment of Roadways Beneath the Goaf and Surrounding Rock Control for Gob-Side Entry Retaining by Roof Cutting

Applied Sciences
In view of the complex stress environment of the underlying roadway and the difficulty in ensuring the stability of entry retaining under the combined action of the goaf and the residual coal pillar, this paper takes the auxiliary intake roadway of the ...
Zhenkai Zheng, Bingyuan Hao, Xuanqi Liu, Heping Hao   +3 more
doaj   +1 more source

Advanced Roof Cutting and Pressure Relief Technology and Application of Mining Roadway

International Journal of Natural Resources and Environmental Studies
In order to solve the problems of complex advanced support of the mining roadway, high labor intensity, poor control effect of the surrounding rock of the roadway, and the impact of the mining efficiency of the working face during the mining period of the 12203 working face of Xinzheng Coal and Power Co., Ltd., the control technology of the surrounding
openaire   +1 more source

Research on Roof Cutting and Pressure Relief Technology of Gob-side Entry Retaining with Hard Roof

Journal of Innovation and Development
Traditional coal pillar roadway protection is easy to cause roadway stress concentration, roadway deformation instability, and low recovery rate of coal resources. In order to solve the stability of roadway mining process and coal mine efficiency. Aiming at the problem of gob-side entry protection by deep hole pre-splitting blasting with hard roof ...
openaire   +1 more source

Study on critical parameters of gob-side entry retaining by roof cutting and pressure relief in inclined coal seams

, 2023
Abstract The study explored how to improve gob side entry retaining by roof cutting in inclined coal seams with thick, inclined, and hard roofs. The research focused on optimizing key parameters through theoretical analysis, numerical simulation, and field monitoring at the 1301 headentry of Great Wall No.6 Mine. Firstly, based on the expansion
Weiping Shi, Zhaoying Li, Changtao Liu, Yanwei Lv, Haoran Zhang, Tao Yang   +5 more
openaire   +1 more source

Stress Evolution Law of Surrounding Rock with Gob-Side Entry Retaining by Roof Cutting and Pressure Release in Composite Roof

, 2020
The stress concentration of gob-side entry surrounding rock is a hot topic in coal mining. In this paper, through theoretical analysis and numerical simulation, the pressure relief mechanism of the gob-side entry retaining by roof cutting and pressure ...
Zhibiao Guo, Manchao He, Peng Song, Yong Zhang, Xiaoming Sun, Huichen Xu   +5 more
core   +1 more source

Dense boreholes for weakening bottom layer by cutting roof and pressure relief of gob-side entry retaining

Meikuang Anquan, 2022
In order to ensure the safe and smooth process of gob-side entry retaining of high stress thick coal seam bottom layer in Guhanshan Coal Mine, combined with the broken condition and gas condition of the regenerated roof, the necessity of adopting dense borehole to cut roof and relieve pressure of the gob-side entry retaining roadway at the bottom layer
LI Dongyin, ZHANG Jingxuan, ZHENG Lijun, WANG Shen, WANG Wen, HUANG Zujun   +5 more
openaire   +1 more source