Results 61 to 70 of about 664 (89)

Research and application of pressure relief technology for fracturing thick hard roof in super-high mining face [PDF]

Aiming at the problems of super-large mining space, strong ore pressure and ultra-high coal wall stability control faced by full-mechanized mining face with ultra-large mining height and thick hard roof, this paper takes the 122104 working face of ...
Peng WANG, Kaikai ZHAO, Xiaoguang SHANG, Yanjun FENG, Zhen ZHANG, Hongpu KANG, Xiaogang LIU, Yangfa ZHENG, Jianchao REN, Futang ZHAO, Rui WANG, Yajun LEI   +11 more
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In Situ Studies on the Characteristics of Strata Structures and Behaviors in Mining of a Thick Coal Seam with Hard Roofs

Energies, 2018
The movements of overburden induced by mining a thick coal seam with a hard roof extend widely. The effects of breakages in the hard strata on the strata behaviors might vary with the overlying strata layers.
Yiwen Lan, Rui Gao, Bin Yu, Xiangbin Meng   +3 more
doaj   +1 more source

Study on disaster mechanism of thick and hard overhanging roof and top cutting control technology

Gong-kuang zidonghua
To address the challenges of significant deformation and high instability risks in the surrounding rock of unsupported roadways beneath a laterally thick and hard overhanging roof, this study focused on the 3810 working face transport roadway in ...
GENG Ming, SUN Jing
doaj   +1 more source

Key technologies for intelligent, efficient, and safe mining of impact thick coal seams due to hard roof [PDF]

To address the challenges of source-based rock burst elimination and efficient mining in ultra-thick coal seams prone to rock bursts due to hard roofs, a safety assurance technology was developed to create a favorable environment for intelligent and ...
Xiangbin MENG, Feilong GUO, Tiejun KUANG, Shibo WANG, Dongyin LI, Yang TAI, Ziyu SHANG, Mingxian PENG, Bin YU   +8 more
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Three-dimensional collaborative hydraulic fracturing control for thick hard roofs: mechanism, simulation, and field application in Yadian Coal Mine

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
Thick hard roof with high strength, large breaking step and strong mine pressure is one of the major problems in coal mine safety production. Aiming at the problems of large thickness, high strength and difficult collapse of the roof slab of Yadian Coal ...
Shuo Ren, Xuehua Li, Shun Liang, Jie He, Zhongwei Li, Changru Li, Hongye Luo   +6 more
doaj   +1 more source

Initial weighting strength control of thick and hard roof based on pre-splitting blasting of whole roadway roof: numerical model and engineering verification

Thick and hard roof poses safety hazards to initial mining and caving of the working face due to its good integrity and large modulus. Taking the initial mining of No.
Yuxuan Wang, Chenyang Liu, Jingkun Zhu, Hui Li, Yiyi Wu   +4 more
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Analysis and Application on Controlling Thick Hard Roof Caving with Deep-Hole Position Presplitting Blasting

, 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.
Changyou Liu, Baobao Chen
core   +1 more source

Application of Long-Distance Drilling and Blasting Technology to Prevent Rock Bursts in High-Level Roofs

Applied Sciences
In view of the high-level, thick, and hard roof in a mine in Shaanxi, it is difficult for existing technology to solve the problem of frequent rock bursts, which are caused by the direct weakening of the whole underground layer.
Qianyue Gu, Anye Cao, Weiwei Zhao, Yao Yang, Chengchun Xue, Qi Hao   +5 more
doaj   +1 more source

Main disaster-causing strata of composite hard roof and bidirectional, high-low position blasting technology for rockburst prevention

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
Theoretical analysis, micro-seismic monitoring, and on-site research were used to examine the main disaster-causing strata of composite hard roof, with a particular focus on rockburst in the working face of thick coal seams.
Xukai Dong, Junwen Zhang, Suilin Zhang, Jining Yang, Chaorui Xing   +4 more
doaj   +1 more source

Surrounding Rock Control Technology of Thick Hard Roof and Hard Coal Seam Roadway under Tectonic Stress

In the process of roadway excavation in thick and hard coal seams with a hard roof, the instantaneous release of a large amount of elastic energy accumulated in coal and rock mass causes disasters.
Haitong Kang, Zhongzong Cao, Chengfang Shan, Honglin Liu, Hongzhi Wang   +4 more
core   +1 more source