Advances in Interpretation and Analysis Techniques for Spectral-analysis-of-surface-waves (SASW) Measurements PDF Download

Author: Sung-Ho Joh
Publisher:
ISBN:
Category : Ocean waves
Languages : en
Pages : 240

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Author: Sung-Ho Joh
Publisher:
ISBN:
Category : Spectrum analysis
Languages : en
Pages : 480

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Author: Jeffrey D. Bertel
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages :

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Book Description
The Spectral-Analysis-of-Surface-Waves (SASW) method is an accepted means of measuring shear wave velocity (VS). In some settings, SASW measurements have produced results that were inconsistent with results from other methods of measurement. The effectiveness of the SASW methodology at complex geotechnical sites was investigated to identify site conditions where the SASW approach may produce erroneous results. Analytical simulations of surface wave measurements were performed. A traditional SASW methodology (global analysis), and a more rigorous approach (array analysis) were used to generate experimental dispersion curves. The effectiveness of these approaches was evaluated by comparing the experimental results to the true dispersion curve. The global analysis yielded dispersion curves that tend to underestimate surface wave velocities at long wavelengths. The array approach worked well for both simple, gradually increasing VS profiles as well as for some complex profiles with large VS contrasts. In some cases both the global and array analysis produce an experimental dispersion curve that is not consistent with the theoretical dispersion curve, especially for soft-over-stiff profiles, a common profile encountered in the field. These results have implications for earthquake site response analysis.

Author: Barbara Aileen Luke
Publisher:
ISBN:
Category : Hydraulic models
Languages : en
Pages : 424

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Author: Sebastiano Foti
Publisher: CRC Press
ISBN: 0415678765
Category : Technology & Engineering
Languages : en
Pages : 492

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Book Description
Develop a Greater Understanding of How and Why Surface Wave Testing Works Using examples and case studies directly drawn from the authors’ experience, Surface Wave Methods for Near-Surface Site Characterization addresses both the experimental and theoretical aspects of surface wave propagation in both forward and inverse modeling. This book accents the key facets associated with surface wave testing for near-surface site characterization. It clearly outlines the basic principles, the theoretical framework and the practical implementation of surface wave analysis. In addition, it also describes in detail the equipment and measuring devices, acquisition techniques, signal processing, forward and inverse modeling theories, and testing protocols that form the basis of modern surface wave techniques. Review Examples of Typical Applications for This Geophysical Technique Divided into eight chapters, the book explains surface wave testing principles from data measurement to interpretation. It effectively integrates several examples and case studies illustrating how different ground conditions and geological settings may influence the interpretation of data measurements. The authors accurately describe each phase of testing in addition to the guidelines for correctly performing and interpreting results. They present variants of the test within a consistent framework to facilitate comparisons, and include an in-depth discussion of the uncertainties arising at each stage of surface wave testing. Provides a comprehensive and in-depth treatment of all the steps involved in surface wave testing Discusses surface wave methods and their applications in various geotechnical conditions and geological settings Explains how surface wave measurements can be used to estimate both stiffness and dissipative properties of the ground Addresses the issue of uncertainty, which is often an overlooked problem in surface wave testing Includes examples with comparative analysis using different processing techniques and inversion algorithms Outlines advanced applications of surface wave testing such as joint inversion, underwater investigation, and Love wave analysis Written for geotechnical engineers, engineering seismologists, geophysicists, and researchers, Surface Wave Methods for Near-Surface Site Characterization offers practical guidance, and presents a thorough understanding of the basic concepts.

Author:
Publisher: World Scientific
ISBN: 9814365165
Category : Civil engineering
Languages : en
Pages : 699

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Book Description
This proceedings contains 89 papers from 25 countries and regions, including 14 keynote lectures and 17 invited lectures, presented at the Third International Conference on Geotechnical Engineering for Disaster Mitigation and Rehabilitation (3ICGEDMAR 2011) together with the Fifth International Conference on Geotechnical & Highway Engineering (5ICGHE), which was held in Semarang, Indonesia, from 18 to 20 May 2011. This is the third conference in the GEDMAR conference series. The first was held in Singapore from 12 to 13 December 2005 and the second in Nanjing, China, from 30 May to 2 June 2008. The proceedings is divided into three sections : keynote papers, invited papers and conference papers under which there are six sub-sections : Case Studies on Recent Disasters; Soil Behaviours and Mechanisms for Hazard Analysis; Disaster Mitigation and Rehabilitation Techniques; Risk Analysis and Geohazard Assessment; Innovation Foundations for Rail, Highway, and Embankments; and Slope Failures and Remedial Measures. The conference is held under the auspices of the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE) Technical Committee TC-303 : Coastal and River Disaster Mitigation and Rehabilitation, TC-203 : Earthquake Geotechnical Engineering and Associated Problems, TC-302 : Forensic Geotechnical Engineering, TC-304 : Engineering Practice of Risk Assessment and Management, TC-213 : Geotechnics of Soil Erosion, TC-202 : Transportation Geotechnics, TC-211 : Ground Improvement, Southeast Asian Geotechnical Society (SEAGS), Association of Geotechnical Societies in Southeast Asia (AGSSEA), and Road Engineering Association of Asia & Australasia (REAAA).

Author: Mahmoud Sedighi Manesh
Publisher:
ISBN:
Category : Marine sediments
Languages : en
Pages : 372

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Author: Masaki Kanao
Publisher: BoD – Books on Demand
ISBN: 9533079444
Category : Science
Languages : en
Pages : 340

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Book Description
The importance of seismic wave research lies not only in our ability to understand and predict earthquakes and tsunamis, it also reveals information on the Earth's composition and features in much the same way as it led to the discovery of Mohorovicic's discontinuity. As our theoretical understanding of the physics behind seismic waves has grown, physical and numerical modeling have greatly advanced and now augment applied seismology for better prediction and engineering practices. This has led to some novel applications such as using artificially-induced shocks for exploration of the Earth's subsurface and seismic stimulation for increasing the productivity of oil wells. This book demonstrates the latest techniques and advances in seismic wave analysis from theoretical approach, data acquisition and interpretation, to analyses and numerical simulations, as well as research applications. A review process was conducted in cooperation with sincere support by Drs. Hiroshi Takenaka, Yoshio Murai, Jun Matsushima, and Genti Toyokuni.

Author: Edward F. Thompson
Publisher:
ISBN:
Category : Water waves
Languages : en
Pages : 30

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Book Description
Guidelines for interpreting nondirectional wave energy spectra are presented. A simple method is given for using the spectrum to estimate a significant height and period for each major wave train in most sea states. The method allows a more detailed and accurate description of ocean surface waves than that given by a single significant height and period, yet it eliminates much of the formidable detail of a full spectrum. An example problem illustrating application of the method is presented. Spectral analysis and display techniques, and the natural variation of spectra in space and time, are discussed. (Author).

Author: JM. Roesset
Publisher:
ISBN:
Category : Dynamic testing
Languages : en
Pages : 19

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Book Description
The Spectral-Analysis-of-Surface-Waves (SASW) technique is a nonintrusive, nondestructive technique that employs surface waves of the Rayleigh type to determine the layer thicknesses and stiffnesses of subsurface profiles. The SASW technique has been developed and successfully used on land. This paper extends the method to sites overlaid by water. A theoretical model has been developed to study the "surface" waves that propagate along a soil-water interface using a half-space overlaid by water as an approximation. The waves at the soil-water interface are termed "Scholte" waves. Results from the theoretical model show that in "deep" water, defined as a water depth exceeding the wave length of the Scholte wave, the effect of water is to reduce the surface wave velocity slightly from the velocity for a similar surface (Rayleigh) wave with air over the surface. Results of experimental studies are also described and shown to compare well with theoretical predictions.