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Multidimensional Morphology of the Ethmoid Roof and Anterior Ethmoidal Artery: A CT-Based Analysis and Proposal of the Akcan Classification. [PDF]

Diagnostics (Basel)
Belada A, Akcan FA, Güçlü D, Güçlü E, Ünlü İ, Subaşı B, Özel MA, İlhan E, Cebeci D, Sungur MA.   +9 more
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Research on surrounding rock control technology of roof cutting and pressure relieving for roadside filling in gob-side entry retaining of large mining height panel. [PDF]

Sci Rep
Weiyong L, Shengjun L, Yaohui S, Tao G, Wansheng M, Xiaowu Z.   +5 more
europepmc   +1 more source

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Determination and Engineering Practice of Unsupported Roof Distance for Rapid Excavation of Roadway with Thick and Hard Basic Roof

Geotechnical and Geological Engineering, 2021
In order to determine the reasonable empty roof distance during roadway excavation, a mechanical model of the direct roof rock beam was established, and the relationship between the direct roof tensile stress and the empty roof distance was obtained. According to the criterion of roof stability, that is, the tensile stress of the roof does not exceed ...
Sen Yang, Xinzhu Hua, Peng Yang, Xiao Liu   +3 more
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Study on the Collapse Mechanism of the Hard Roof Rocks

Advanced Materials Research, 2012
The collapse of the hard roof rocks was characterized by its sudden and entire breakage and falling during the mining of the shallow-thick coal seams in Datong district. In this paper, structural mechanics methods was used to study the collapse mechanism of the hard roof rocks.
Qing Guo Huang, Feng Gao, Jun Zhao
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The mechanism and prevention of rockburst induced by the instability of the composite hard-roof coal structure and roof fractures

Engineering Fracture Mechanics
Junwen Zhang, Xukai Dong
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Failure of the hard roof and the impact on coal burst occurrence

2022
A coal burst is one of the fiercest and most dynamic, instability events in underground longwall mining. The coupled static and dynamic loadings are recognised as one of the main factors that lead to coal bursts. To qualify the static and dynamic loadings, it is essential to understand the mining-induced mechanical behaviour of strata which includes ...
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Effect of Premining on Hard Roof Distress Behavior: A Case Study

Rock Mechanics and Rock Engineering, 2019
Considering the complex geological conditions of mining in the fully mechanized 828 working face of the Qingdong Coal Mine, a mining plan was developed for premining the upper No. 7 coal seam to control the hard roof and gas of the No. 8 coal seam. Failure depth of the No. 7 coal seam floor and the caving interval of the hard roof were analyzed using a
Weidong Pan, Xiaodong Nie, Xinyuan Li
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Μulti-jointed stratified hard rock roof analysis and design

International Journal of Rock Mechanics and Mining Sciences, 2018
Abstract An arched roof can support a much greater load than a horizontal beam. This increase in the carrying capacity stems from the fact that the downward movement due to gravity creates a compressive arch. The behavior of multi-jointed hard rock roof under gravity load is hereby investigated under the novel view of the compressive arch forming a ...
Paraskevi Yiouta-Mitra, Alexandros I. Sofianos   +1 more
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Study on Characteristics of Energy for Hard Roof Fracture in Island Workface

Advanced Materials Research, 2013
According to the characteristics of the island workface with hard roof, various mechanical models of hard roof in island workface are established, to analyze energy characteristics of hard roof before and after the first fracture in island workface with all round gobs, derived their simplified formulas of bending strain energy for hard roof before and ...
Xu Feng Pang, Ke Xue Zhang
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Analysis and design of an underground hard rock voussoir beam roof

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1996
Abstract The behaviour of a voussoir hard rock beam roof is investigated by considering it to act as a symmetric flat arch with cracks at the abutments and at midspan. Analytical formulae are derived initially that evaluate, for any given geometry, loading and mechanical parameters of the beam, its deflection and strain within it in terms of the ...
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