Results 71 to 80 of about 3,345,704 (190)

Study on Roof‐Control Technology for Gob‐Side Entry Retaining Under Composite Roofs

Energy Science &Engineering, EarlyView.
This study develops a roof‐control technology system for gob‐side entry retaining under composite roofs. By integrating field measurements, theoretical analysis, and numerical simulation, it reveals the spatiotemporal evolution of the plastic zone and proposes a targeted support method, providing theoretical and practical guidance for safe and ...
Dong Li, Yujiang Zhang, Yunlou Du, Haodong Zheng, Baoji Yang   +4 more
wiley   +1 more source

Optimization of Blasting‑Induced Roof Cutting Parameters in Key Stratum and Its Application in Gob‑Side Entry Retention Technology

Energy Science &Engineering, EarlyView.
This study addresses hard roof coal seam conditions by optimizing key stratum blasting‐cutting parameters through theoretical analysis, numerical simulation, and field tests. It proposes calculation methods for blast hole spacing and delay timing based on stress wave theory, controlling roadway deformation within 35 mm, thereby enhancing resource ...
Qiong Liu, Duanxiang Fu, Hongbin Li
wiley   +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

Numerical Simulation Study on Optimization of Horizontal Sublevel Top‐Coal Caving Mining Technique for Steeply Inclined Extra‐Thick Coal Seam

Energy Science &Engineering, EarlyView.
As the sublevel height increases, the top‐coal recovery amount gradually increases, but both the top‐coal recovery rate and the thickened top‐coal recovery rate show a downward trend, and the decline in the top‐coal recovery rate is gradually increasing. The comparison indicates that the optimal sublevel height is 20 m.
Hongsheng Tu, Dingyi Hao, Wenhong Xiao, Fuhao Jiang, Shikun Xu   +4 more
wiley   +1 more source

Damage Characteristics and Stress Distribution Law of Overburden Rock in Multiple Mining of Close Coal Seams

Energy Science &Engineering, EarlyView.
This study on close coal seams shows that multi‐seam mining increases the height of the fractured zone from approximately 26 m (single upper‐seam mining) to about 49 m. When the lower seam is mined after the extraction of the upper seam, the heights of both the caved zone and the fractured zone increase by approximately two times.
Xiaoyu Wu, Lei Guo, Zedong Sun, Xiaowei Wu, Nan Zhang   +4 more
wiley   +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

Isolation, Insularity and Resilience: A Review of the Geophysical, Socioeconomic, and Environmental Vulnerabilities of Gran Canaria and Lesvos Islands for Policy Interventions to Global Change

Sustainable Development, EarlyView.
ABSTRACT The dynamic nature of small islands being geographically isolated and their perceived connectedness with global networks complicates research attempts to draw general conclusions on whether insularity leads to marginalization or strengthens their resilience for sustainable development.
Toheeb Lekan Jolaosho, Mazen Marouani, Takwa Boughanmi   +2 more
wiley   +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