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RISS 인기검색어
- 검색키워드
- 저자 : M. Sharifzadeh (검색결과 2 건)
- 무료
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Mehrishal, S.,Sharifzadeh, M.,Shahriar, K.,Song, J. J. Springer Science + Business Media 2017 Rock mechanics and rock engineering Vol.50 No.4
<P>In relation to the shearing of rock joints, the precise and continuous evaluation of asperity interlocking, dilation, and basic friction properties has been the most important task in the modeling of shear strength. In this paper, in order to investigate these controlling factors, two types of limestone joint samples were prepared and CNL direct shear tests were performed on these joints under various shear conditions. One set of samples were travertine and another were onyx marble with slickensided surfaces, surfaces ground to #80, and rough surfaces were tested. Direct shear experiments conducted on slickensided and ground surfaces of limestone indicated that by increasing the applied normal stress, under different shearing rates, the basic friction coefficient decreased. Moreover, in the shear tests under constant normal stress and shearing rate, the basic friction coefficient remained constant for the different contact sizes. The second series of direct shear experiments in this research was conducted on tension joint samples to evaluate the effect of surface roughness on the shear behavior of the rough joints. This paper deals with the dilation and roughness interlocking using a method that characterizes the surface roughness of the joint based on a fundamental combined surface roughness concept. The application of stress-dependent basic friction and quantitative roughness parameters in the continuous modeling of the shear behavior of rock joints is an important aspect of this research.</P>
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Evaluation of the hydraulic aperture of a rock joint using wavelet theory
Ahmad Mehrishal,M. Sharifzadeh 한국자원공학회 2013 Geosystem engineering Vol.16 No.1
Both mechanical and hydraulic behaviors of rock joints are closely dependent on joint aperture. Understanding how fracture wall roughness affects the fluid flow is important when modeling many subsurface problems. In this paper, a new evaluation method of joint hydraulic aperture using surface asperities height was developed, and the value of hydraulic aperture under different shear displacements was determined using the multi-scale wave decomposition method based on the wavelet theory and some statistical indices. For this purpose, a high-resolution laser scanning system was applied. The numerical simulations were based on the experimental data obtained by Sharifzadeh, Mitani, Esaki, and Urakawa (2004. Development of evaluation method of rock joint aperture distribution. EUROCK & 53 Geomechanics Colloquium) from a series of hydromechanical shear tests on natural granite rock joints. Using this method, the hydraulic aperture of joint surfaces has been developed for different shear steps to model the fluid flow of rock joints. The modeling procedure of mechanical aperture (or dilation) was precise and reliable. In addition, the proposed procedure appropriately estimated both hydraulic aperture and fluid flow rate. The conformity in the results of modeling and laboratory tests satisfactorily indicated the success of the proposed procedure.
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