Results 31 to 40 of about 16,961 (284)

Theory and technical system of control of far-near field hard roofs from ground and underground in a large space stope

Meitan xuebao, 2023
The stope space, after mining an extra-thick coal seam with hard roofs, is large, and its law of mining pressure is complex. The mechanism of strong mine pressure action for this stope is unclear, and there is a lack of multi-point control technology ...
Bin YU, Yang TAI, Tiejun KUANG, Rui GAO, Jingxuan YANG, Binwei XIA, Weibing ZHU, Yong LI   +7 more
doaj   +1 more source

Ground fracturing pre-control technology for potential mine seismic risk of thick and hard roof

Meitan kexue jishu, 2023
Mines with thick and hard roof face high risks of mine seismic activities and mine pressure during mining, which easily leads to dynamic disasters in mines.
Shuwen WANG, Baoyan ZHI, Taotao DU, Guangyu YANG, Chuang LU, Yongxue XIA   +5 more
doaj   +1 more source

Determination and Application of the Unsupported Roof Distance in Coal Roadway Driving With the Thick and Hard Main Roof [PDF]

, 2020
Abstract The authors have requested that this preprint be removed from Research Square.
Yang Sen, Hua Xin Zhu, Yang Peng, Liu Xiao, Li Chen, Wang En Qian   +5 more
openaire   +3 more sources

Investigation of the process of perforating hard roof in an innovative technology of directional roof‐cutting by composite blasting

Energy Science & Engineering, 2023
AbstractThe hard roof in coal mines will induce strong pressure problems for the working face and the lanes, which will seriously affect the safe and efficient production of the mine. For these issues, our team developed a new technology of cutting hard roof by composite blasting.
Bochao Ma, Yang Tai, Yong Li, Hongchun Xia, Xiangbin Meng   +4 more
openaire   +2 more sources

Experimental Study on Presplitting Blasting of Roof Cutting Along Goaf with Thick and Hard Roof Plate

IOP Conference Series: Earth and Environmental Science, 2021
Abstract In order to explore the reasonable blasting parameters of the gob-side entry retaining technology under the specific conditions of thick and hard roof, and realize successful roof cutting and safe roadway retaining, the thick and hard roof of the XV1306 working face in the first panel of Yixin Coal Mine is used as the research ...
Jianquan Tang, Hongliang Liu, Anfa Chen
openaire   +1 more source

Calculation of periodic roof weighting interval in longwall mining using finite element method [PDF]

, 2013
11.02.13 KB.
Oraee-Mirzamani, B, Goshtasbi, G, Hosseini, N, Gholinejad, M   +3 more
core   +1 more source

Mechanical Analysis of the First Fracture Characteristics of Hard Roof of Extra-thick Coal Seam

Meikuang Anquan, 2020
In order to investigate the failure mechanisms of the hard roof in the fully mechanized caving face in the extra-thick coal seam, the mechanical analysis model of the first breaking of the hard top roof in the fully mechanized caving mining of the extra-
LIANG Shaping, LU Yinlong, GUO Peng, WU Bingzhen
doaj   +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. The LS-DYNA was used to analyze the blasting effect of the energy-gathering pipe. Using the methods of theoretical analysis and numerical simulation, it was determined that the optimal ...
Chaowen Hu, Eryu Wang, Qian Li, Yilong Wang, Yongyuan Li, Xingfeng Sha   +5 more
openaire   +1 more source

Study on the dynamic evolution characteristics of deformation and collapse of the extra-thick hard roof

矿业科学学报, 2021
Yima coal field has an extra-thick hard rock strata, which is the main cause of many dynamic disasters in the mining area. Based on the mining face 21221 of Qianqiu mine in Yima coal field, Henan Province, China, this paper studies the movement ...
Wang Hongwei, Deng Daixin, Jiang Yaodong, Shi Ruiming, Yang Guozhen, Zhang Xiaohai   +5 more
doaj   +1 more source

Mining-Induced Stress-Fissure Field Evolution and the Disaster-Causing Mechanism in the High Gas Working Face of the Deep Hard Strata

Geofluids, 2020
The compound dynamic disaster of coal and gas outbursts and rockburst is a typical hazard jeopardizing the mining of the high gas content coal seam under a hard roof condition.
Litong Dou, Ke Yang, Wenjie Liu, Xiaolou Chi   +3 more
doaj   +1 more source