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Research on bending-slip rib spalling and rib stability of extra-thick hard coal wall. [PDF]

Sci Rep
Xue B, Shang Y, Wang C, Zhang F, Liu Y.
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Appearance mechanism and prevention technology of impact energy of roadway floor on additional load. [PDF]

Sci Rep
Wei H, Li X, Shi D, Qin D, Wang K.
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Deep-hole directional fracturing of thick hard roof for rockburst prevention

Tunnelling and Underground Space Technology, 2012
Abstract Thick hard roof in coal mines is usually a significant factor that induces dynamic disasters, such as rockburst. This study introduces a new technology called directional hydraulic fracturing characterized by cutting out an initial groove in the borehole and then injecting high pressure liquid to break the rock.
Hu He, Linming Dou, Jun Fan, Taotao Du, Xinglin Sun   +4 more
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Stress evolution caused by hard roof fracturing and associated multi-parameter precursors

Tunnelling and Underground Space Technology, 2019
Abstract To reveal the mechanism and precursors of the “1.21” rockburst induced by hard roof fracturing in the No. 1 working face of the Junde coal mine (JCM), the inversions including P-wave velocity, velocity gradient, stress concentration and accumulated energy were elaborately conducted by seismic tomography, and the static high-stress ...
Cai-Ping Lu, Yang Liu, Guang-Jian Liu, Tong-Bin Zhao   +3 more
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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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Experiment simulation of hydraulic fracture in colliery hard roof control

Journal of Petroleum Science and Engineering, 2016
Abstract Hydraulic fracture geometry is of paramount importance to enhance fracture effect in colliery hard roof control. Near wellbore complexity often resulted in low lateral dimension of induced fracture hence the fracking effect of the treatment.
null Cong Lin, null Jianqiang Deng, null Yaoru Liu, null Qiang Yang, null Hongfei Duan   +4 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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Rockburst Risk Analysis During High-Hard Roof Breaking in Deep Mines

Natural Resources Research, 2020
Mining operations continue to advance to greater depths to address the demand and supply of coal. However, deep mining occurs in complex and dangerous environments where mines are often subject to rockbursts induced by high-hard roof breaking (HHRB).
Qiming Zhang, Enyuan Wang, Xiaojun Feng, Yue Niu, Muhammad Ali, Song Lin, Hao Wang   +6 more
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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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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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