Results 71 to 80 of about 18,778 (96)

Elastoplastic Analysis of Surrounding Rocks of the Pressure Tunnel

Applied Mechanics and Materials, 2013
According to the triple shear unified yield criterion, the mechanical behavior of the pressure tunnel was put forward. The calculation formulas of the radius of plastic zone were deduced with considerations of the effects of the intermediate principal stress.
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Pressure Relaxation in a Hole Surrounded by Porous and Permeable Rock in Hole Pressure Tests with Gas Injection

Journal of Applied Mechanics and Technical Physics, 2006
The pressure testing of a hole in porous and permeable rock by gas injection is considered. An integral equation for the hole pressure relaxation is obtained whose numerical and analytical solutions describe the dependence of the relaxation time of hole pressure on the reservoir properties of the surrounding porous rock as well as on the initial gas ...
Shagapov, V. Sh., Khusainov, I. G., Khafizov, R. M.   +2 more
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The Surrounding Rock of Deep Borehole Pressure Relief and Let the Pressure Bolt Coupling Analysis

Applied Mechanics and Materials, 2013
Roadway borehole pressure relief and let the pressure anchor combined support technology were based on using the new pressure high strength bolt instead of ordinary bolt ,Combined with the borehole pressure relief principle, aim at releasing high stress of surrounding rock of roadway ,Complying with the deformation characteristics of supporting ...
Shu Guang Zhang, Long Chen, Hong Yu Jia
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Effect of Borehole Positions and Depth on Pressure Relief of Cavern Surrounding Rock Mass

Geotechnical and Geological Engineering, 2021
As the development scale and depth increasing, the frequency and intensity of rock burst and other surrounding rock dynamic disasters are also increasing, which seriously affects the safety construction and operation of cavern engineering. At present, one of the most commonly used methods to control rock burst risk is use borehole pressure relief ...
Zhaofeng Chen, Tao Xu, Xu Dai, Jiacheng Song   +3 more
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Impact of pressure of surrounding medium on plain water jet cutting of rocks

The International Journal of Advanced Manufacturing Technology, 2016
The goal of this contribution is to investigate problems connected with the application of plain water jets in surroundings between jet outlet and target differing from standard atmosphere. Two cases are especially interesting from the practical viewpoint.
Josef Poláček, Eva Janurová
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Study on Stability of Surrounding Rock in Shallow Tunnel under Unsymmetrical Pressure

Applied Mechanics and Materials, 2013
Both of the stress field and deformation are unsymmetrical for shallow tunnel under unsymmetrical pressure and geological disaster such as collapse is easily to take place. This brings about troubling problems to both design and construction. In this paper, a case of Hongshigou tunnel is studied.
Su Chao Xu, T. Y. Liu, C.Y. Jin
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Effect of creep of concrete and surrounding rocks on the stress in pressure-tunnel linings

Hydrotechnical Construction, 1972
1. Rock creep is an unfavorable factor leading to a considerable increase of tensile stresses in a pressuretunnel lining. On the contrary, concrete creep leads to a decrease of tensile stresses in the lining, but the practical use of this circumstance is possible only under conditions of a gradual increase of tunnel pressure to the operating ...
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Blast Vibration Response of Tunnel Influenced by Confining Pressure and Surrounding Rock Type

Applied Mechanics and Materials, 2014
Based on the finite element model of the tunnel, dynamic response of tunnel is studied influenced by different confining pressure and different surrounding rock types under of blasting vibration under blast vibration load. The results show that when the confining pressure increases, the maximum horizontal and vertical vibration velocity, stress and ...
Tie Jun Tao, Chun Ming Xie, En An Chi, Ming Sheng Zhao   +3 more
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Study on the Mining Induced Stress of Hard Surrounding Rock under Dynamic Pressure

Advanced Materials Research, 2014
There is a series of features of the strata-pressure behavior of hard surrounding rock which is affected by dynamic pressure, such as the caving of the roof is difficult, sudden and large-area. In this paper we focus on the mining and support of 14-1103 working face, In view of the problems of the mine such as the roof is hard to caving, the suspension-
Ji Ping Liu, Shao Jian Zhan, Yun Peng Guan, Li Jing Chuan, Jun Tang, Hong Wei Wang   +5 more
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Stress calculation of unlined pressure tunnel surrounding rock in hydraulic engineering

2013 2nd International Symposium on Instrumentation and Measurement, Sensor Network and Automation (IMSNA), 2013
In hydraulic engineering, the running state of pressure diversion tunnel directly affects the normal use and economic benefit of the whole project. This paper bases on the deep-lying circular tunnel and analyse stress distribution in the unlined hydraulic tunnel surrounding rock by using the finite element method, respectively study the stress after ...
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