Results 41 to 50 of about 5,156 (170)

Simulation test on water-rock interaction in coal mine goaf

, 2023
Water accumulation is widely present in the goaf of coal mine in China. It is of great significance to clarify the water-rock interaction mechanism in the closed and semi-closed goaf environment for water pollution reduction and groundwater resource ...
Ge, CHEN, Yajun, SUN, Li, ZHANG, Yating, GAO, Weiyang, CHEN, Tianci, CHEN, Xianming, ZHAO, Zhimin, XU, Juan, GUO, Lulu, ZHU   +9 more
core   +1 more source

Mechanism and disaster control new technology of strong ground pressure manifestation in ultra‐large mining face

Deep Underground Science and Engineering, EarlyView.
In response to the problem of strong mining pressure manifestation along the goaf roadway in a thick coal seam mining area, this study uses a new type of combined blasting roof cutting technology to effectively control the manifestation and deformation of mining pressure along the goaf roadway.
Xiaoding Xu, Manchao He, Jun Yang, Yubing Gao, Qiang Fu, Qing Ma, Yajun Wang   +6 more
wiley   +1 more source

Mechanism of “seesaw‐type” rock burst in coal seam mining beneath mountainous areas

Deep Underground Science and Engineering, EarlyView.
This study reveals the mechanism of “seesaw‐type” rock bursts during coal mining beneath mountainous areas. The advancing working face induces nonuniform fracturing of the overburden. The detached mountain mass then undergoes a seesaw‐type rotational movement around a shifting pivot, driving the primary fracture through a characteristic “open‐close ...
Chao Zhou, Xueqiu He, Zhenlei Li, Ping Wang, Dazhao Song, Fuxing Jiang, Shan Yin, Anliang Lü, Menghan Wei, Taoping Zhong   +9 more
wiley   +1 more source

Dynamic prediction of coal and gas outburst risk based on quantitative analysis of stress–energy evolution and adaptive correction

Deep Underground Science and Engineering, EarlyView.
This study quantitatively analyzed the spatiotemporal evolution of stress redistribution ahead of the working face by integrating coal seam distribution, tectonic stress anomalies, gas pressure, and mining‐induced disturbances. An R‐value criterion for coal and gas outburst (CGO) risk assessment was established based on energy principles.
Yingjie Zhao, Xueqiu He, Dazhao Song, Liming Qiu, Minggong Guo, Jie Liu, Qiang Liu, Yi Zhu   +7 more
wiley   +1 more source

3D geological model reconstruction and collapse risk evaluation of old goaf in Dunqiu iron mine

Scientific Reports
The complexity of goafs put forward higher requirements for detection methods. A comprehensive detection method for old goaf is proposed, that is, determining the plane distribution range of old goaf by using high-precision magnetic method, determining ...
Hailong Wang, Zhenhua Zhao, Lin Han, Zhenjiang Luo   +3 more
doaj   +1 more source

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

Observation of “Three Zones” of Spontaneous Combustion in Goaf Under the Influence of Gas Drainage in Outburst Coal Seam

Meikuang Anquan, 2020
In view of the working face of coal and gas outburst, adopting the measures of gas drainage and outburst elimination will increase the air leakage in the goaf, and then change the flow field in the goaf, resulting in too long oxidation zone in the goaf,
LI Xin, LIU Dongming, TANG Hui, WANG Bo
doaj   +1 more source

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

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 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