Research on dual pressure relief and outburst prevention model for deep floor rock roadways

2021 ◽  
Vol 14 (10) ◽  
Author(s):  
Zhonghua Wang ◽  
Bing Chen ◽  
Yongjiang Zhang ◽  
Huiming Yang ◽  
Cao Jianjun
Keyword(s):  
Pressure Relief ◽  
Floor Rock ◽  
Prevention Model

scholarly journals Mechanism and Control of Roadway Floor Rock Burst Induced by High Horizontal Stress

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Dongming Guo ◽  
Xinchao Kang ◽  
Zhiying Lu ◽  
Qiyu Chen
Keyword(s):  
Rock Burst ◽  
Prevention And Control ◽  
Large Diameter ◽  
Horizontal Stress ◽  
Steel Tube ◽  
Pressure Relief ◽  
Floor Rock ◽  
Concrete Filled Steel Tube ◽  
Rock Burst Risk ◽  
And Control

According to the characteristics of rock burst of high horizontal stress roadway floor, the rock burst mechanism of roadway floor was studied with the background of south track roadway Xing’an mine. Based on the deflection theory and energy principle of the slab, the mechanical model of the floor of the roadway under high horizontal stress was established, the stress and energy criteria of rock burst occurred in the floor of the roadway were deduced, the prevention and control measures of the floor pressure relief with large diameter borehole and concrete-filled steel tube pile support were put forward, and the key parameters were determined. By establishing a numerical model, the evolution law of plastic zone, horizontal stress, and elastic strain energy density of roadway floor with or without support is contrastively analyzed. The results show that the effective means to prevent and control the floor rock burst is to cut off the stress transfer path by weakening the hard floor to reduce floor energy accumulation so as to reduce the floor rock burst risk. Based on the above research, field tests were carried out, and the microseismic monitoring results showed that the floor pressure relief of large diameter boreholes and concrete-filled steel tube pile support effectively relieved the floor rock burst and guaranteed the safety and efficiency of roadway excavation. This technology can provide a reference for the prevention and control of floor rock burst of similar roadways.

Study on Floor Pressure Relief Law of Simultaneous Mining Working Faces in close Distance Seam Group of Dongsheng Coalfield

2014 ◽  
Vol 941-944 ◽  
pp. 2525-2532
Author(s):  
De Ming Chen ◽  
Chun Lei Zhang
Keyword(s):  
Rock Mass ◽  
Pressure Change ◽  
Theoretical Formula ◽  
Coal Pitch ◽  
Mine Pressure ◽  
Pressure Relief ◽  
Floor Rock ◽  
Working Face ◽  
Damage Depth ◽  
The Impact

In order to research floor pressure relief law of shallowly buried descending coal-mining working face covered with thin soft bedrock in Dongsheng coalfield , taking Lijiahao coal mine for example, firstly, to calculate the impact depth was 18.86m by the theoretical formula, then analyzing coal and rock mass stress and displacement variation of the upper work surface to its floor during mining based on numerical simulation. Obtaining coal and rock pressure relief depth of the floor was 70m, with the working face advancing, the pressure relief depth and range became larger, to achieve stable at a certain number;affected by the mining of 2-2 coal, coal and rock mass strength of its floor was weak, the largest damage depth was about 18m,this result would provide a basis to the roadway of the 3-1 coal in different coal pitch; affected by the mining, the goaf overburden and floor of 2-2 coal working face appeared "O" shape fracture zone, the floor rock fissure of 2-2 coal got through to the roof of 3-1 coal,cracks formed transfixion,which made the pressure change of 3-1 coal working face, Mine pressure appearance tended to be ease, it would be easily control if the roadway of 3-1 coal was arranged in the area of pressure relief. The theoretical results would be useful to actual production.

Testing the Relapse Prevention Model With Marijuana Dependence

1994 ◽  
Author(s):  
R. S. Stephens ◽  
◽  
R. A. Roffman ◽  
E. E. Simpson
Keyword(s):  
Relapse Prevention ◽  
Prevention Model ◽  
Relapse Prevention Model

On the assessment of ventricular reconfiguration after intracranial pressure relief. What information is encoded in size and form?

2004 ◽  
Vol 31 (S 1) ◽  
Author(s):  
C Preul ◽  
M Tittgemeyer ◽  
D Lindner ◽  
C Trantakis ◽  
J Meixensberger ◽  
...  
Keyword(s):  
Intracranial Pressure ◽  
Pressure Relief

Revisão sistemática sobre os posicionamentos de tilt e recline para usuários de cadeira de rodas

2018 ◽  
Vol 19 (3) ◽  
pp. 417
Author(s):  
Luma Carolina Gradim ◽  
Paulo Vinícius Braga Mendes ◽  
Debora Caires Paulisso ◽  
Daniel Marinho Cezar Da Cruz
Keyword(s):  
Web Of Science ◽  
Pressure Relief

Introdução: O uso prolongado de cadeira de rodas pode acarretar em lesões por pressão, dores e perda de independência funcional. O método de inclinação e/ou de reclinar (tilt/recline) é prescrito para neutralizar e minimizar esses efeitos nocivos. Porém, não há um consenso de qual ângulo destes recursos é o ideal, bem como a eficiência destes para os usuários. Objetivos: a) conhecer e verificar quais angulações dos sistemas de posicionamento de tilt e recline são mais utilizadas e favoráveis para os usuários de cadeira de rodas e; b) classificar pesquisas encontradas pelo seu nível de evidência. Métodos: Trata-se de uma revisão sistemática sem meta-análise. Foram recuperados artigos publicados até setembro de 2017, na Biblioteca Virtual em Saúde-BVS, Pubmed, Scopus, Web of Science e OTseeker, utilizando as palavras-chave: “wheelchair”, “tilt-in-space”, “tilt-recline”, “recline”, “pressure relief” e “repositioning systems”. Resultados: A maioria dos artigos selecionados correspondeu ao nível IV de evidência, que se caracteriza como estudos não experimentais. Os principais resultados apontam que a combinação de tilt e recline favorece o alívio de pressão na região das nádegas dos usuários de cadeira de rodas e promove conforto postural, mas para existir eficácia, há a necessidade de maiores angulações. Identificou-se que os menores ângulos são os mais realizados pelos usuários de cadeira de rodas, com a finalidade de gerar conforto e alívio de pressão. Conclusão: A prescrição e utilização dos sistemas de posicionamentos variáveis favorecem o usuário de cadeira de rodas, sendo os efeitos proporcionalmente relacionados ao grau de angulação adotado.Palavras-chave: úlcera por pressão, reabilitação, traumatismos da medula espinal, cadeiras de rodas.

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