Study on Fracture Behavior of Directly Covered Thick Hard Roof Based on Bearing Capacity of Supports
Applied Sciences, 2023 Mine pressure at the working face is severe due to it being directly covered by a thick hard roof. To further investigate the technology of controlling the mine pressure of a thick hard roof, the upper working face of 13,121 in Gubei mine of Huainan ...
Jiawen Li +4 more
doaj +5 more sources
Safety and high-recovery mechanisms and application research for initial mining of thick-coal-seam with complex structure and thick-hard roof [PDF]
Scientific ReportsThick-coal-seam with complex structures and thick-hard roof in the initial mining phase pose various challenges, including a long weighting interval, strong rock pressure, poor top coal caving performance (TCCP), and significant coal loss. These problems
Zechao Chang +7 more
doaj +5 more sources
Influence mechanism of thick hard layer on fracture and energy release characteristics of composite roof [PDF]
Scientific ReportsInvestigating the instability and energy release characteristics of layered roof structures is crucial for elucidating the mechanism of rockburst induced by strata fracture.
Xiao-shuai Song +5 more
doaj +3 more sources
A case study of the periodic fracture control of a thick-hard roof based on deep-hole pre-splitting blasting [PDF]
Energy Exploration & Exploitation, 2022 A thick-hard roof implies a large hanging-roof and high-frequency dynamic strata behaviour during mining, which may jeopardise personnel safety and equipment.
Baobao Chen, Changyou Liu, Bing Wang
doaj +3 more sources
Research on Non-Pillar Coal Mining for Thick and Hard Conglomerate Roof
Energies, 2021 This article introduces a new non-pillar coal mining technology (i.e., Gob-side Entry Retaining by Roof Cutting (GERRC)) under the condition of thick and hard roofs.
Xiaoyu Liu +3 more
doaj +4 more sources
Investigation on the Movement and Fracture Characteristics of an Extra-Thick Hard Roof during Longwall Panel Extraction in the Yima Mining Area, China [PDF]
Geofluids, 2021 As an extra-thick hard roof is a significant contributing factor to frequently induced sudden roof collapse accidents and coal bursts, this study investigates the relationship between extra-thick hard roof movement and mining-induced stress using ...
Hongwei Wang +5 more
doaj +3 more sources
Ground control strategies for longwall top-coal caving panel in extra-thick coal seams with thick-hard roof [PDF]
Scientific ReportsThick-hard roof fracturing presents a significant challenge for disaster prevention in longwall mining. This study investigates the 15,311 south working face and develops a mechanical model to analyze energy release during both initial and cyclic roof ...
Rui Wang +4 more
doaj +3 more sources
Frontiers in Earth Science, 2022 Aiming at the mining disaster of a thick hard roof, based on the analysis of the mining instability influence of the thick hard roof, this study constructs the mining bearing mechanical model of the thick hard roof by using mechanical theory and obtains ...
Qingwei Bu +5 more
doaj +3 more sources
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 +5 more
doaj +2 more sources
Applied SciencesThis study aims to address the pronounced stress concentration in roadway-surrounding rock under conditions of multiple thick and hard roof strata at Xiao jihan coal mine, China.
Hui Liu +5 more
doaj +2 more sources