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 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 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 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 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 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 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 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 Calibration Chamber Testing written by An-Bin Huang and published by . This book was released on 1991 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Government Reports Annual Index written by and published by . This book was released on 1985 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book References to Contemporary Papers on Acoustics written by Frederick E. White and published by . This book was released on 1986 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index Keyword A L written by and published by . This book was released on 1985 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Shear Stress on Dynamic Bulk Modlus of Sand written by John H. Schmertmann and published by . This book was released on 1978 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of shear stress on the magnitude and directional variation of the dynamic bulk modulus of sand was investigated by means of a program of laboratory measurements of P-wave and S-wave velocities under varied stress conditions. The sand used was air-dry Reid-Bedford Model sand and was tested at relative densities of about 25% and 80%. Test specimens were 4 ft high by 4 ft in diameter, formed by pluviation in air a cylindrical pressure chamber. The test results indicate that compression and shear wave velocities vary with direction in an isotropic stress field due to inherent anisotropy of the sand structure, but that this phenomenon has only a modest (0-20%) effect in producing anisotropy in the bulk modulus. The work tends to confirm, within + or - 10%, that the shear wave velocity depends only on the level of octahedral normal effective stress and not on stress anisotropy. IN contrast with the shear wave velocity, the compression wave velocity increases significantly in the direction of the major principal stress and depends primarily on the effective stress on the plane normal to wave travel. Values of bulk modulus, computed from the wave velocities under the assumption of elastic isotropy, show a variation with direction, which contradicts the assumption of isotropy. Appendix A contains photographs of typical oscilloscope waveforms from each replicate series of five impacts, and Appendix B presents tables of corrected Vp and Vs, the push wave and shear wave velocities, respectively, from each test.
Download or read book Proceedings of the World Conference on Earthquake Engineering written by and published by . This book was released on 1992 with total page 930 pages. Available in PDF, EPUB and Kindle. Book excerpt: Each of the volumes for the 1984 conference deals with one or more topics related to earthquake engineering.
