Download or read book Effect of state of stress velocity of low amplitude compression waves propagating along principal stress directions in sand written by Stuart E. Kopperman and published by . This book was released on 1982 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of State of Stress on Velocity of Low Amplitude Compression Waves Propagating Along Principal Stress Directions in Dry Sand written by Stewart E. Kopperman and published by . This book was released on 1982 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Little research has been performed in which the effect of biaxial and triaxial states of stress on the propagation velocity of compression and shear waves has been investigated. Therefore, a triaxial testing device was constructed, and an initial test series was performed to determine the relationship between propagation velocities and state of stress in a dry sand. The testing device was constructed of reinforced steel and was designed to hold a cubic soil sample measuring 7 ft (2.1 m) on a side. Rubber membranes were placed between the soil and three mutually perpendicular walls of the cube, corresponding to the three principal planes. Stress and strain measuring devices were also placed in the soil. The effects on compression of the sample were determined. Structural anisotropy caused a variation between principal stress axes of about ten percent in velocity at a given pressure. Stress history resulted in no noticeable variation in P-wave velocity and, therefore, was neglected. Biaxial and triaxial loading results lead to the same conclusion, namely that the velocity of compression waves propagating along principal stress directions in dry sand as low-amplitude body waves depends only on the stress in the direction of wave propagation.
Download or read book Effect of State of Stress on Velocity of Low amplitude Shear Waves Propagating Along Principal Stress Directions in Dry Sand written by David P. Knox and published by . This book was released on 1982 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Little research has been performed in which the effect of biaxial and triaxial states of stress on the propagation velocity of compression and shear waves has been investigated. Therefore, a triaxial testing device was constructed, and an initial test series was performed to determine the relationship between propagation velocities and state of stress in a dry sand. The testing device was constructed of reinforced steel and was designed to hold a cubic soil sample measuring 7 ft (2.1 m) on a side. Rubber membranes were placed between the soil and three mutually perpendicular walls of the cube, corresponding to the three principal planes. Stress and strain measuring devices were also placed in the soil. The effects on compression of the sample were determined. Structural anisotropy caused a variation between principal stress axes of about ten percent in velocity at a given pressure. Stress history resulted in no noticeable variation in P-wave velocity and, therefore, was neglected. Biaxial and triaxial loading results lead to the same conclusion, namely that the velocity of compression waves propagating along principal stress directions in dry sand as low-amplitude body waves depends only on the stress in the direction of wave propagation.
Download or read book Effects of structural and stress anisotropy on velocity of low amplitude compression waves propagating along principal stress directions in dry sand written by H. Y. F. Chu and published by . This book was released on 1983 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 7-ft cubical sample of dry sand was tested using the triaxial device constructed by Kopperman et al (1982) and Knox et al (1982). The sand was the same as that used by Kopperman and Knox. A new raining device was fabricated and used to construct this sand sample which resulted in a more uniform sample than prepared earlier. Improvements were also made to the excitation ports in order to have better control. Extensive tests were performed under the following different stress states: isotropic, biaxial and triaxial. In each case, velocities of P-waves propagating along all principal stress directions were measured. Results from these tests lead to the following conclusions: (1) the effect of stress history on P-wave velocity is negligible, (2) the sample can be treated as a cross-anisotropic material under isotropic confinement due to structural anisotropy, (3) complete anisotropy resulted by the coupling of stress anisotropy and structural anisotropy, and (4) P-wave velocity depends on the principal effective stress in the direction of propagation with principal stresses perpendicular to the direction of propagation having a negligible effect on velocity.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1982 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wave Propagation in Granular Media written by American Society of Mechanical Engineers. Winter Annual Meeting and published by American Society of Civil Engineers. This book was released on 1989 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1983 with total page 1252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of Second Symposium on the Interaction of Non nuclear Munitions with Structures written by and published by . This book was released on 1985 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book G otechnique written by and published by . This book was released on 1996 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 28 (thesis year 1 983) a total of 10,661 theses titles from 26 Canadian and 197 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 28 reports theses submitted in-1983, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Download or read book Effect of Shear Stress on Dynamic Bulk Modulus of Sand written by John H. Schmertmann and published by . This book was released on 1978 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of the Dynamic Properties of Artificially Cemented Sand at Low Confining Pressures written by Deron J. Van Hoff and published by . This book was released on 1994 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Tenth World Conference on Earthquake Engineering written by and published by CRC Press. This book was released on 1992 with total page 866 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Laboratory Study of the Effect of Stress State on the Elastic Moduli of Sand written by Martin D. Lewis and published by . This book was released on 1990 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new laboratory device was built which uses dynamic wave propagation to determine independently the constrained (M), Young's (E), and shear (G) moduli by measuring the dilational, bar and shear wave velocities, respectively. This device, the multi-moduli testing device, can vary the principal stress, in compression or extension, that is parallel to the longitudinal axis of a cylindrical soil specimen, creating a state of stress in the specimen. Dilational and shear wave velocities are determined using pulse test methods. Bar wave velocity is determined using a longitudinal resonant method in which the first 4 natural frequencies of the specimen are determined. Bar wave velocity is computed from the natural frequencies using a two-step reduction process that begins by computing the phase velocity assuming 1-dimensional motion. The 2nd step uses the 3-D solution for longitudinal wave propagation in an infinite rod to adjust the phase velocities. Resulting values for the bar wave velocity are typically within 5% of each other. Tests conducted on dry, uncemented sand subjected to isotropic and biaxial stress conditions showed that when confined isotropically, all 3 moduli could be adequately described by a relationship involving a constant times the mean effective stress raised to a power ranging from 0.45 to 0.51. M and E tests show that the principal stress in the direction of wave propagation controls or dominates the modulus; principal stresses perpendicular to the propagation direction have more influence on E than M. (MM).
Download or read book Advances in the Art of Testing Soils Under Cyclic Conditions written by Vijay Khosla and published by . This book was released on 1985 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanics of Materials with Discontinuities and Heterogeneities written by Anil Misra and published by . This book was released on 1995 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soils and Waves written by J. Carlos Santamarina and published by . This book was released on 2001 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: J. Carlos Santamarina, Georgia Institute of Technology, USA in collaboration with Katherine A. Klein, University of Toronto, Canada; Moheb A. Fam, Cairo University, Egypt Soils are unique materials. Analogous to all other particulate materials, their properties depend on environmental parameters, such as confinement and fluid characteristics. While their behavior is complex, simple micromechanical analyses at the particle level provide unparalleled insight. Furthermore, elastic and electromagnetic waves can be effectively used to gain complementary information about the particulate medium, leading to unique possibilities for studies in engineering and science, including field applications for site assessment and process monitoring. This book is divided into five parts. The first part dwells on the problem of scale and includes a general introduction to materials. In the second part, the behavior of particulate materials is reviewed, with emphasis on the microscale interpretation of macroscale behavior. Fundamental differences between fine and coarse particulate materials are highlighted. The third and fourth parts center on the propagation of mechanical and electromagnetic waves in particulate materials, addressing phenomena such as stiffness, polarization and losses. These two units include laboratory techniques to measure the elastic and electromagnetic spectral response of particulate materials, and an extensive compilation of experimental data. Finally, the fifth part applies elastic and electromagnetic waves to monitoring process in soils. Emphasis is placed on clear, simple analyses and explanations of complex physical phenomena, making this book ideal for self-study. Furthermore, no other book provides such an in-depth description of soils and their behavior and the interaction of elastic and electromagnetic waves and particulate materials (including material data and experimental methods). Thus, this is an invaluable reference for postgraduates, research scientists and practitioners in geotechnical, civil and environmental engineering, as well as scientists in related areas such as physics, geophysics and materials science.
