Results 31 to 40 of about 4,083 (232)

Analysis and Application on Controlling Thick Hard Roof Caving with Deep‐Hole Position Presplitting Blasting [PDF]

Advances in Civil Engineering, 2018
For the thick hard roof (THR) in Datong mining area, mining operations often led to large‐scale hanging‐roof and frequent and strong strata behavior, threatening mining safety seriously. Based on the instability mechanism, the fracture model for THR was established, including rock blocks articulation and combined cantilever beam, and the limit initial ...
Baobao Chen, Changyou Liu
openaire   +2 more sources

Key Parameters of Roof Cutting of Gob-Side Entry Retaining in a Deep Inclined Thick Coal Seam with Hard Roof [PDF]

Energies, 2019
Gob-side entry retaining by roof cutting (GERRC) employed in a deep inclined thick coal seam (DITCS) can not only increase economic benefits and coal recovery, but also optimize surrounding rock structure. In accordance with the principles of GERRC, the technology of GERRC in DITCS is introduced and a roof-cutting mechanical model of GERRC is proposed ...
Jinzhu Hu, Manchao He, Jiong Wang, Zimin Ma, Yajun Wang, Xingyu Zhang   +5 more
openaire   +2 more sources

Optimization Analysis of Advanced Support for Thick and Hard Roof

International Journal of Natural Resources and Environmental Studies
Based on the geological conditions of 1033 working face in Yuandian No.1 Coal Mine, this paper studies the support distance and support strength of hydraulic support in the advanced section of roadway roof. Through numerical simulation analysis, the advance support range of the advance roadway is 5m, 10m, 15m, 20m and 25m four kinds of distance plastic
Yongkun Zhang, Kaiwei Wang
openaire   +1 more source

Migration characteristics and disaster reduction and erosion prevention mechanism of thick and hard roof in deep filling mining

Meitan kexue jishu
To address the issue of rock burst disasters induced by the fracture of thick-hard roof strata, focuses on deep thick and hard roof. By integrating theoretical analysis, engineering experiments, and field monitoring, the fracture characteristics of thick-
Erhu BAI, Ranlie WANG, Wenbing GUO, Yi TAN, Hui LI, Xueyi LI, Sulin CHENG   +6 more
doaj   +1 more source

Study on the Spatiotemporal Dynamic Evolution Law of a Deep Thick Hard Roof and Coal Seam

Processes, 2023
Underground mining in coal mines causes strong disturbance to geological structures and releases a large amount of elastic strain energy. When the roof is a hard and thick rock layer, it is easy to cause dynamic disasters such as rock burst. To analyze the impact of a deep thick and hard roof fracture on the safe mining of thick coal seams, this paper ...
Zhigang Zhang, Linchao Dai, Haitao Sun, Yanbao Liu, Huiming Yang, Rifu Li, Yi Zhang   +6 more
openaire   +1 more source

Collaborative application of directional blasting presplitting and flexible formwork concrete wall technologies in Chengzhuang Coal Mine

Meikuang Anquan, 2022
In order to improve the recovery rate of coal resources in general, Chengzhuang Coal Mine has carried out and implemented the technology of gob-side entry retaining in 5309 large height mining face.
SI Xiaopeng, ZHOU Changtai
doaj   +1 more source

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

Multiscale Coupling From Mastication to Retronasal Aroma Perception: The PG‐DTCFN Model and Multiphysics Simulation

Advanced Science, EarlyView.
Using grilled lamb skewers as a model system, this work builds a multiscale coupling framework from oral processing to retronasal aroma perception, reveals dual‐kinetic release patterns and Electroencephalogram‐characterized central encoding features, and proposes an interpretable physics‐guided deep learning model validated by multiphysics simulation,
Che Shen, Xiongfeng He, Zihao Li, Zidong Chen, Jiajin Sun, Xinyu Jiang, Yunhui Zhang, Lizhang Wu, Ran Wang, Jingnan Lu, Bo Wang, Kezhou Cai, Baocai Xu   +12 more
wiley   +1 more source

Thick-hard strata movement law and multi-dynamic load mechanism in longwall face with ultra-large cutting height

Meitan xuebao
Large mining height technology is characterized by high yield, high efficiency, and high recovery rate. It has become the preferred technology for mining thick coal seams in Yushen mining area.
Jiachen WANG, Zhaohui WANG, Wenchao SUN, Meng LI, Xin ZHANG, Jialong LI, Dongxin HOU   +6 more
doaj   +1 more source

System and application of regional fracking of coal seam roof on and under the ground to prevent rockburst

Meitan kexue jishu, 2023
To solve the problems of small local relief range, low continuity and high operational risk of rockburst, regional hydro-fracking and burst prevention system and engineering application research were carried out within thick and hard roof of a coal seam ...
PAN Junfeng, LU Chuang, MA Xiaohui, XIA Yongxue, XIE Fei, XU Gang, DOU Guidong, LYU Dazhao, SUN Xiaodong, MA Wentao   +9 more
doaj   +1 more source