Experimental study on imaging hydraulic conductivity of rock masses based on elastic wave velocity dispersion

Yoshimura, Kimitaka; Ando, Kenichi; Sakashita, Susumu; Bruines, P.; Okumura, Hirohumi; Nishiyama, Satoshi; Ohnishi, Yuzo

doi:10.3124/segj.62.307

Cited by 4 publications

(1 citation statement)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As mentioned already the velocity of a P-wave shows the dispersion depending on the frequency, e.g., the velocity becomes large to a certain frequency then decrease, and this tendency appears more remarkable when more damage was included [7]. In addition, in strictly Q-value also depends on the frequency, showing the dispersion [8], the value shall be dealt with frequency. In fact, Q values by two employed methods were different in the way of excitation as in Figure 5; however, it can be regarded as well that roughly the damage could be evaluated by Q-value, e.g., Q-value showing between 170-270 demonstrates intact condition of the material, 130 stands for 5%, and about 100 for 10% damage.…”

Section: Resultsmentioning

confidence: 82%

Interpretation of Fatigue Damage Evolution in RC Slabs by Means of Innovative 3D AE Tomography

Shiotani¹,

Nishida²,

Asaue³

et al. 2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

View full text Add to dashboard Cite

The authors have been studying NDT based techniques that have potential to exhibit damage not only qualitatively but quantitatively. In the paper, two major aspects contributing to the damage have been introduced: a prospective damage index representing real internal condition; and damage visualization techniques with an acoustic approach, namely AE tomography. For a prospective damage index, Q-value, an attenuation feature of stress wave and can be treated as an irrespective parameter of frequency is demonstrated using several types of specimens changing the volume of artificial damage. And as for an innovative and the latest NDT technology, 3D AE tomography, which can visualize the internal 3D damage evolution, only from one side access situation, is introduced, followed by experimental verification using RC slabs subjected to cyclic mobile loads.

show abstract

Section: Resultsmentioning

confidence: 82%

Interpretation of Fatigue Damage Evolution in RC Slabs by Means of Innovative 3D AE Tomography

Shiotani¹,

Nishida²,

Asaue³

et al. 2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

View full text Add to dashboard Cite

show abstract

Study on Dispersion of Longitudinal Elastic Waves in Rock Specimens

Nishiyama¹,

Ohnishi²,

Yano³

et al. 2011

J. JSCE, Ser. C

View full text Add to dashboard Cite

2 フェロー会員京都大学副学長(〒606-8501 京都市左京区吉田本町) 3 正会員京都大学大学院技術専門員工学研究科(〒615-8540 京都市西京区京大桂) 4 正会員産業技術総合研究所地圏資源環境研究部門(〒305-8567 茨城県つくば市東1-1-1) 5 正会員原子力発電環境整備機構(〒108-0014 東京都港区芝4-1-23) 6 正会員株式会社大林組(〒108-8502 東京都港区港南2-15-2

show abstract

Study on Dispersion of Longitudinal Elastic Waves in Porous Media

Nishiyama

Yano

Ohnishi

2012

J. Soc. Mat. Sci., Japan

View full text Add to dashboard Cite

Survey methods using elastic wave velocity have been performed in order to estimate the pore fluid properties in rock mass, but the viscosity and density of pore fluid have not been estimated quantitatively by the values of velocity or the velocity changes. We describe in this paper whether pore fluid properties can be estimated by using the dispersion of longitudinal elastic waves. We measured the frequency-dependent velocity data of longitudinal elastic waves in porous specimens and the dependence of the velocity dispersion on the kinematic viscosity of pore fluid. Moreover, we try to explain the velocity dispersion shown by the measurement data using the Biot theory. The Biot theory explains that the dispersion phenomenon is caused by the elastic property change in the media with the interaction between the solid phase and liquid phase, so the dispersion is dependent on the properties of liquid phase. The measurement data showed the phase velocities of longitudinal waves increased with an increase of frequencies and the characteristic frequencies which indicate the points of inflection moved to higher frequencies with an increase of kinematic viscosities of pore fluid. We report that we can estimate the kinematic viscosity of pore fluid in rock mass by using the dispersion curves which graphed the relation between the phase velocities and frequencies.

show abstract

Experimental study on imaging hydraulic conductivity of rock masses based on elastic wave velocity dispersion

Cited by 4 publications

References 10 publications

Interpretation of Fatigue Damage Evolution in RC Slabs by Means of Innovative 3D AE Tomography

Interpretation of Fatigue Damage Evolution in RC Slabs by Means of Innovative 3D AE Tomography

Study on Dispersion of Longitudinal Elastic Waves in Rock Specimens

Study on Dispersion of Longitudinal Elastic Waves in Porous Media

Contact Info

Product

Resources

About