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中国科学院地质与地球物理研究所2002学术年会

作者： Dinghui Yang~a,Zhongjie Zhang~b a.Department of Mathematical Sciences,Tsinghua University,Beijing 100084,PR China. b.Institute of Geophysics,Chinese Academy of Sciences,Beijing 100101,PR China

There is relative motion and inertial coupling between solids and fluids during seismic and acoustic propagation in rocks with *** inertial coupling is anisotropic because of the microvelocity anisotropy of the fluid relative to solid in an anisotropic *** Biot mechanism and the squirt-flow mechanism are the two most important mechanisms of solid/fluid interaction in *** extend the Biot/squirt(BISQ) theory to include the solid/fluid coupling anisotropy and develop a general poroelastic wave equation including both mechanisms *** new model estimates velocity/frequency dispersion and attenuation of waves propagating in the 2D PTL (periodicthinlayers)+EDA(extensive dilatancy anisotropy) medium with *** attenuation and dispersion of the two quasi-P-waves and the quasi-SV-wave,which are related to the solid/fluid coupling density and the permeability tensors,are *** anisotropy are simultaneously affected by the anisotropics of the solid skeleton,the permeability,and the solid/fluid coupling effect of the *** modeling suggests that variations of attenuation of both the fast quasi-P-wave and the quasi-SV-wave strongly depend on the permeability *** the low-frequency range,the maximum attenuation is in the direction of the maximum permeability for the fast quasi-P-wave and in the direction of the minimum permeability for the *** attenuation behaviors of the two waves in the high-frequency range,however,are opposite to those in the low-frequency *** paper also presents numerically how the attenuation and velocity dispersion of both the fast quasi-P-wave and the quasi-SV-wave are influenced by the anisotropic solid/fluid coupling *** model results demonstrate when the wave propagation is perpendicular to the direction of maximum solid/fluid coupling density,the wave motion exhibits maximum attenuation(Q-1) and maximum velocity dispersion for the fast quasi-P-wave,and m

关键词： poroelastic wave equation Biot/squirt anisotropy

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Ultrasound poroelastic Tissue Typing

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Open Journal of Acoustics 2011年第3期1卷 55-62页

作者： Piero Chiarelli Bruna Vinci Antonio Lanatà Valeria Gismondi Simone Chiarelli 不详

Employing the poroelastic theory of acoustic waves in gels, the ultrasound (US) propagation in a gel medium filled by poroelastic spherical cells is studied. The equation of fast compressional wave, the phase velocity and the attenuation as a function of the elasticity, porosity and concentration of the cells into the gel matrix are investigated. The outcomes of the theory agree with the preliminary measurements done on PVA gel scaffolds inseminated by porcine liver cells at various concentrations. The feasibility of a non-invasive technique for the health assessment of soft biological tissues steaming by the model is analyzed.

关键词： Ultrasound Bi-Phasic Model of Living Tissues Non-Invasive Ultrasound Assessment poroelastic Ultrasounds in Soft Tissues

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A Study on Propagation of Waves in a Transversely Isotropic poroelastic Layer Bounded between Two Viscous Liquids

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Open Journal of Acoustics 2019年第1期9卷 1-12页

作者： Nageswaranath Chinta Ahmed Shah Syed Ramesh Modem Venkata Ramanamurthy Mangipudi Department of Mathematics BVRITH College of Engineering for Women Hyderabad India Department of Mathematics Deccan College of Engineering and Technology Hyderabad India Department of Mathematics University College of Technology Osmania University Hyderabad India Department of Mathematics Osmania University Hyderabad India

Propagation of Love waves in a transversely isotropic poroelastic layer bounded between two compressible viscous liquids is presented. The equations of motion in a transversely isotropic poroelastic solid are formulated in the framework of Biot’s theory. A closed-form solution for the propagation of Love waves is obtained in a transversely isotropic poroelastic layer. The complex frequency equation for phase velocity and attenuation of Love waves is derived for a transversely isotropic poroelastic layer when it is bounded between two viscous liquids and the results are compared with that of the poroelastic layer. The effect of viscous liquids on the propagation of Love waves is discussed. It is observed that the presence of viscous liquids decreases phase velocity in both transversely isotropic poroelastic layer and poroelastic layer. Results related to the case without viscous liquids have been compared with some of the earlier results and comparison shows good agreement.

关键词： Viscosity Love Waves Wave Number Dissipation Coefficient Transversely Isotropic poroelastic Layer

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Vibration Analysis of an Infinite poroelastic Circular Cylindrical Shell Immersed in Fluid

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Open Journal of Acoustics 2012年第2期2卷 86-93页

作者： Syed Ahmed Shah Department of Mathematics Deccan College of Engineering and Technology Hyderabad India

The purpose of this paper is to study the effect of presence of fluid within and around a poroelastic circular cylindrical shell of infinite extent on axially symmetric vibrations. The frequency equation each for a pervious and an impervious surface is obtained employing Biot’s theory. Radial vibrations and axially symmetric shear vibrations are uncoupled when the wavenumber is vanished. The propagation of axially symmetric shear vibrations is independent of presence of fluid within and around the poroelastic cylindrical shell while the radial vibrations are affected by the presence of fluid. The frequencies of radial vibrations and axially symmetric shear vibrations are the cut-off frequencies for the coupled motion of axially symmetric vibrations. The non-dimensional phase velocity as a function of ratio of thickness to wavelength is computed and presented graphically for two different types of poroelastic materials for thin poroelastic shell, thick poroelastic shell and poroelastic solid cylinder.

关键词： Biot’s Theory Axially Symmetric Vibrations Radial Vibrations poroelastic Cylindrical Shell Pervious Surface Impervious Surface Phase Velocity Cut-off Frequency

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A Note on the Effect of Negative Poisson’s Ratio on the Deformation of a poroelastic Half-Space by Surface Loads

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Engineering（科研） 2010年第6期2卷 432-437页

作者： Sunita Rani Raman Kumar Sarva Jit Singh 不详

The aim of this note is to study the effect of negative Poisson’s ratio on the quasi-static deformation of a poroelastic half-space with anisotropic permeability and compressible fluid and solid constituents by surface loads. Two particular cases considered are: two-dimensional normal strip loading and axisymmetric normal disc loading. It is found that a negative Poisson’s ratio makes the Mandel-Cryer effect more prominent. It also results in an increase in the magnitude of the surface settlement.

关键词： Anisotropic Permeability Auxetic Material Negative Poisson’s Ratio poroelastic Half-Space Quasi-Static Deformation Surface Loading

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Torsional Vibrations of Coated Hollow poroelastic Spheres

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Open Journal of Acoustics 2017年第1期7卷 18-26页

作者： Syed Ahmed Shah Chinta Nageswaranath Modem Ramesh Mangipudi Venkata Ramanamurthy Department of Mathematics Deccan College of Engineering and Technology Hyderabad India Department of Mathematics Vardhaman College of Engineering Hyderabad India Department of Mathematics College of Technology Osmania University Hyderabad India Department of Mathematics Osmania University Hyderabad India

Torsional vibrations of coated hollow poroelastic spheres are studied employing Biot’s theory of wave propagation in poroelastic solid. The dilatations of solid and liquid media are zero, therefore the frequency equation of torsional vibrations is same both for a permeable and an impermeable surface. The coated poroelastic sphere consists of an inner hollow poroelastic sphere bounded by and bonded to a sphere made of distinct poroelastic material. The inner sphere is designated as core and outer sphere as casing. Core and casing are bonded at the curved surfaces. The inner and outer boundaries of the coated hollow poroelastic sphere are free from stress and at the interface of core and casing the displacement and stresses are continuous. It is assumed that the each material of coated sphere is homogeneous and isotropic. The frequency equation of torsional vibrations of a coated poroelastic hollow sphere is obtained when the material of the core vanishes. Also a coated poroelastic solid sphere is obtained as the limiting case of the frequency equation of coated hollow poroelastic sphere when the inner radius of core approaches to zero. Non-dimensional frequency as a function of ratio of thickness of core to that of inner radius of core is determined and analyzed. It is observed that the frequency and dispersion increase with the increase of the thickness of the coating.

关键词： Coated poroelastic Sphere Torsional Vibrations Permeable Surface Impermeable Surface Frequency Equation Dissipation Mode of Vibration

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Evaluation of sample scale effect on geomechanical tests

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Petroleum Research 2022年第4期7卷 527-535页

作者： Maryam Kashfi Saeed Shad Davood Zivar Department of Chemical and Petroleum Engineering Sharif University of TechnologyTehranIran PanTerra Geoconsultants B.V LeiderdorpNetherlands

The size of the rock specimen affects the stress concentrates in the vicinity of the top/bottom of the rock specimen during the evaluation of the geomechanical parameters in the laboratory,which causes un-reliable ***,the appropriate size for geomechanical evaluation is not well understood yet because of limitations in the sampling and *** this study,a series of numerical simulations using a finite element package was conducted to investigate the effect of sample aspect ratio,fluid saturation,and porosity,on the mechanical behavior of the rock under elastic and poroelastic *** addition,two concepts,stress/strain homogeneity index(SHI)and representative elementary volume(REV),were developed to find out the appropriate sample *** results show that the presence of stiff platens,which are dissimilar to the specimen material,causes significant stress concentration in the two ends of the *** concentration of stress in the specimen reduces when the aspect ratio *** optimum aspect ratio(length-to-diameter equal to 3)was observed by SHI analysis which after that the changes in stress concentration are *** REV size analysis confirms the obtained optimum aspect ratio by SHI *** saturated specimens show a lower magnitude of stress than applied stress because of the presence of pore pressure,which can carry a portion of the *** higher void ratio results in lower strength of the *** study could be beneficial for the better design of geomechanical tests to have reliable results.

关键词： Geomechanics Stress concentration Stress/strain homogeneity index Representative elementary volume(REV) poroelastic Scale dependency

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Three-dimensional steady-state closed form solution for multilayered fluid-saturated anisotropic finite media due to surface/internal point source

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Applied Mathematics and Mechanics(English Edition) 2021年第1期42卷 17-38页

作者： Lianzhi YANG Fanmin HE Yang LI Zhiyong SONG School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China Chengdu Surveying Geotechnical Research Institute Co. Ltd.of China Metallurgical Group CorporationChengdu 610023China Department of Aerospace Science and Technology Space Engineering UniversityBeijing 101416China

A three-dimensional(3 D)steady-state solution of fluid saturated anisotropic finite media is *** eigenequation method and the pseudo-Stroh formalism are used to obtain the exact solution for homogeneous saturated finite *** propagator matrix method is introduced to deal with the corresponding multilayered poroelastic *** poroelastic solutions due to surface or internal point fluid source are *** comparison of the results of the saturated isotropic media in a half space and those obtained by the finite element method is given to illustrate the accuracy of the solution in a finite *** solutions of a sandwich poroelastic medium are presented to analyze its hydromechanical *** ratios of the horizontal permeability to vertical permeability and different source positions are *** results show that the fluid parameters and source positions have great influence on the hydromechanical behaviors of the layered media.

关键词： poroelastic pseudo-Stroh formalism multilayered point fluid source

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