Results 91 to 100 of about 1,488 (167)

Study on Deep Hole Blasting for Roof Cutting, Pressure Relief and Roadway Protection in Deep Multi-Coal Seam Mining

Applied Sciences
Deep multi-coal seam mining is plagued by intense mining pressure, significant impacts of multi-working face mining on system roadways, and difficult surrounding rock deformation control—these issues severely threaten the safe and normal operation of ...
Zhongyuan Ren, Mengxiang Wang
doaj   +1 more source

Study on pressure relief and permeability enhancement effect of cutting coal seam with diamond-bead wire saw

Meitan xuebao
In order to explore the pressure relief and permeability enhancement effect around coal seam slot cut by diamond-bead wire saw, firstly, the mechanical model of a doubly clamped roof beam based on the stress of the slot roof was established to analyze ...
Shuqing LI, Chenhui LÜ, Fei HUANG, Yunlai QIAN, Xiangtao HUANG, Tianzhe ZHAO, Zhu TANG, Fengling YANG, Chen WANG   +8 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

Deep-hole directional blasting for roof cutting and pressure relief in coal mines and its applications

矿业科学学报
This study proposes a deep-hole directional blasting technology based on polymer energy charge packages for roof cutting and pressure relief as a solution to difficult roadway support and poor stability of coal pillars due to high pressure of composite ...
ZHANG Zhaoran, NING Jiahao, DENG Yanhua, LI Juntao, CHEN Jianwei, MA Jiahao   +5 more
doaj   +1 more source

Research on the Deformation and Failure Mechanism of Flexible Formwork Walls in Gob-Side-Entry Retaining of Ultra-Long Isolated Mining Faces and Pressure Relief-Control Technology via Roof Cutting

Applied Sciences
To resolve the critical issues of severe deformation, structural failure, and maintenance difficulties in the advanced reuse zone of gob-side-entry retaining roadways under pillarless mining conditions in ultra-long fully mechanized top-coal caving ...
Heng Wang, Junqing Guo
doaj   +1 more source

Numerical study on surrounding rock control effect of gob-side entry retaining by roof cutting and pressure relief

Meikuang Anquan, 2021
To study the influence of roof cutting and pressure relief on the surrounding rock control effect of gob-side entry retaining, numerical simulation was carried out by UDEC software, and the stress and deformation characteristics law of roadway surrounding rock under two states of whether the lateral roof collapsed or not were analyzed. The results show
openaire   +1 more source

Research on the technology of uniformly injecting nitrogen into the porous long pipes in the gob of the gob-side entry retaining mining mode with roof cutting and pressure relief. [PDF]

Sci Rep
Jing Z, Zhou X, Li Y, Bai G, Zhang S.
europepmc   +1 more source

Synergistic mechanism and stability control of gob-side entry retaining by pressure relief and roadside filling in thick coal seams. [PDF]

Sci Rep
Shen F, Rui X, Liu C, Yang J.
europepmc   +1 more source

Design and application study of the key technical parameters of dense drilling for pressure relief in coal mine roofs: a case study. [PDF]

Sci Rep
Ma J, Wang H, Li X, Dong G, Yuan Y.
europepmc   +1 more source

Mechanism and control strategies for asymmetric floor heave in extra-thick coal seam roadways under high stress. [PDF]

Sci Rep
Zhang J, Sun J, Wang B, Yang T, He Y, Gao S, Qin G, Zhang Y.   +7 more
europepmc   +1 more source