Results 41 to 50 of about 2,878 (183)

Research on gas extraction technology in goaf across working face

Gong-kuang zidonghua, 2023
The Y-shaped ventilation continuous working face adopts the technology of gob-side entry retaining to improve the coal recovery rate. As the working face recovers, the goaf area will expand and connect.
LI Qianrong, WANG Zhaofeng, WANG Shujun, AN Fenghua, TIAN Xingrun   +4 more
doaj   +1 more source

Numerical Simulation of Surface Deformation in Goaf

IOP Conference Series: Earth and Environmental Science, 2020
Abstract Coal mine goaf is a hidden, complex, surface deformation of a large range and easy to cause geological disasters of the bad construction site, the surface engineering construction of great harm. The uneven subsidence, horizontal movement, deformation, collapse and other disasters of the goaf surface have serious potential safety
Dingkang Hu, Nainan He, Debin Gao
openaire   +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

Research on Optimal Width of Coal Pillars in Both Sides of Abandoned Mining Areas and Tunnel Control Technology

Energy Science &Engineering, Volume 14, Issue 8, Page 3625-3637, August 2026.
This study primarily investigates the optimal width for coal pillar retention in both sides of the worked‐out face section. Taking the 42201 haulage roadway of the 42201 working face at Shengxin Coal Mine as the primary research target, it analyses the optimum width for coal pillar retention through theoretical calculations, numerical simulations, and ...
Shuaifeng Yin, Kanglei Han, En Wang, Yitao Yan, Xubo Zhao   +4 more
wiley   +1 more source

Study on temporal and spatial distribution and treatment of “U” ventilation gas in gob-side entry retaining

Meikuang Anquan, 2023
Aiming at the problem of gas accumulation in upper corner and return air roadway of single U type ventilation mining in early stage of gob-side entry retaining in Mingxin Coal Mine, the mathematical equation of gas convection and diffusion is established
ZHANG Zeyu, QIAO Yonggang, LI Haojun, LUO Tongtong, GUO Qiang, LI Lianghong
doaj   +1 more source

Stability Evaluation and Parametric Optimization of Coal‐Concrete Composite Bearing Systems Under Mine‐Water‐Induced Deterioration: Experiments and FEINN Analysis

Energy Science &Engineering, Volume 14, Issue 8, Page 3697-3725, August 2026.
Mine‐water immersion tests reveal pronounced coal weakening (vs. minor concrete degradation), identifying coal pillars as the stability‐limiting component in composite dams. A coupled FEINN framework quantifies extreme‐pressure stability and ranks multi‐parameter designs via a normalized multi‐indicator scheme, enabling optimized dam configuration for ...
He Wen, Hongchuan Dai, Guixin Zhang, Pengzhe Li, Tong Yang, Cang Gong, Renbo Gao   +6 more
wiley   +1 more source

Financial Statement Information and Equity Value: The Role of Real Options Characteristics

Financial Management, Volume 55, Issue 2, Page 301-328, Summer 2026.
ABSTRACT This paper examines whether firm‐specific real options characteristics are equity value‐relevant beyond valuation estimates anchored in financial statements. Using extensive historical data for the United Kingdom, we assess and compare the forecast accuracy and explanatory power for stock prices of equity valuation models based on residual ...
Mingyu (Chandler) Chen, Colin Clubb, Tarik Driouchi   +2 more
wiley   +1 more source

Goaf gas flow modelling in 6km long longwall panel [PDF]

Podzemni Radovi, 2017
Understanding the goaf gas distribution in the start-up areas and in 6km long retreat panel is critical for developing gas management and spontaneous combustion (sponcom) control strategies.
Tanguturi Krishna, Balusu Rao, Bongani Dlamini   +2 more
doaj  

Study on influence law of non-uniform overburden load on goaf subsidence in open-pit mine

Meikuang Anquan, 2021
In order to study the influence law of non-uniform overburden load on the goaf subsidence of open-pit mine, based on mining subsidence theory and technology, a subsidence model of goaf was established.
SU Erhuan, CHEN Tao, NIU Jingfu, LIU Yu
doaj   +1 more source

Stress Redistribution Mechanisms and Subsidence Control of Fluidized Gangue Backfilling in Underground Coal Mining: Integrated Experimental and Numerical Investigation

Energy Science &Engineering, Volume 14, Issue 5, Page 2476-2498, May 2026.
Fluidized gangue backfilling controls mining subsidence through stress redistribution in composite backfill‐pillar systems, reducing surface settlement and stress concentrations. Multi‐scale experimental and numerical analysis provides quantitative design parameters for optimizing ground control in sustainable underground coal mining operations ...
Weilong Zhang, Jie Zhang, Yuanzhen Zhang, Wenjing Liu, Liang Li, Deyi Nan, Guannan Zhao, Chen Yang, Haiqing Bian, Hua Shao, Xiao Zuo, Changtai Zhou   +11 more
wiley   +1 more source