Automated Inversion Procedure for Spectral Analysis of Surface Waves

Ganji, Vahid; Gucunski, Nenad; Nazarian, Soheil

doi:10.1061/(asce)1090-0241(1998)124:8(757)

Cited by 123 publications

(62 citation statements)

References 25 publications

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“…Below 9 Hz, output value does not truly represent the variation due to input signal and original signal along with the ambient noise get ampliˆed creating swamp in the output signal. The maximum frequency required for analysis depends upon the depth of interest and in case of near surface soil site characterization the minimum depth of interest is approximately 0.5 m. It is observed that 150-200 Hz frequencies are able to yield waves of such depths (Nazarian, 1984;Foti, 2000;Ganji et al, 1998). For the present study maximum frequency considered is 200 Hz.…”

Section: Experimental Programmentioning

confidence: 77%

Evaluation of SASW Test Configurations and Associated Data Uncertainties in Generating Site Specific Dispersion Curves

Mukherjee

Prashant

2009

Soils and Foundations

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Section: Experimental Programmentioning

confidence: 77%

Evaluation of SASW Test Configurations and Associated Data Uncertainties in Generating Site Specific Dispersion Curves

Mukherjee

Prashant

2009

Soils and Foundations

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“…A less than 9% difference in dispersion curves between three tests conducted The original programs that performed the inversion process employed trial-and-error methods or optimization techniques, which make the inversion process computationally expensive and prone to numerical problems. However, an automated inversion procedure contained in a program called AutoSASW has been developed which has been demonstrated to give more reliable results for irregular profiles and some complex pavement systems and allows site characterization to larger depths (Ganji et al, 1998). The study did not report specific results on the accuracy of the pavement thickness as determined by the program.…”

Section: Spectral Analysis Of Surface Waves (Sasw) Test Methodsmentioning

confidence: 99%

Performance Related Specifications (PRS) for Concrete Pavements in Indiana, Volume 2: Technical Report

Graveen¹,

Falker²,

Beaver

et al. 2009

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Prepared in cooperation with the Indiana Department of Transportation and Federal Highway Administration. AbstractPerformance-Related Specifications (PRS) are specifications that base pavement acceptance and pay adjustment on the projected performance and predicted life-cycle cost (LCC) for a specific pavement. PRS relate measurable quality characteristics with pavement performance through computer simulations that incorporate physical distress models. Previously, work at ERES consultants by Darter and co-workers developed prototype PRS for jointed plain portland cement concrete pavements (PCC) through Federal Highway Administration (FHWA) through a series of research projects. However, before this research program began, pavements have not been constructed using these specifications.This report describes the Indiana Department of Transportation's (INDOT) experience with developing and implementing the first and second Level 1 PRS projects during the re-construction of a portion of I-465 east of Indianapolis and I-65 north of Clarksville, respectively. This report includes an overview of the concepts behind PRS, the process of developing a Level 1 PRS, lessons learned from implementing the first PRS in the construction of the pavement outside Indianapolis during the summer of 2000, lessons learned from implementing the second PRS in the construction of the pavement outside Clarksville during the summer of 2002, the use of non-destructive testing procedures to obtain measures of pavement quality, sample specifications, and conclusions and recommendations. In general, this specification was well received by both the agency and the contractors. It is believed that lessons learned on these projects will enable future modifications to the development of performance related specifications with the hope that these specifications will enable longer lasting, more cost effective pavements to be constructed. Unfortunately, prescriptive specifications failed to address the acceptable variability that can occur in the construction of concrete pavements. According to Hughes (1996), in the 1960's virtually no materials or construction properties met the specifications 100% of the time and some met the specifications less than 50% of the time. Furthermore, prescriptive specifications did not always provide the desired end results, even when properly followed (Chamberlin 1995).To address these deficiencies, statistical quality assurance specifications were developed in the 1970s. These specifications were spurred on by two factors: the results of the American Association of State Highway Officials (AASHO) Road Test (1956Test ( -1962 and the growth of the interstate highway system (Chamberlin 1995). Quality Assurance (QA) specifications replaced some of the prescribed methods with descriptions of desirable material properties (Kopac 2002).Also, QA specifications helped to accommodate technological innovation that would have otherwise been prevented by method specifications. Contractors increased their control over the...

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“…Many filtering criteria were proposed as shown in Table 3 adopted from Ref. [18]. In this study, [19] criterion was chosen as it is widely used in SASW method.…”

Section: Spectral Analysis Surface Waves Testmentioning

confidence: 99%

Dynamic Soil Stiffness Between WAK, SASW and SCPT Tests

2014

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This paper describes an experimental investigation for determining the dynamic soil stiffness by applying the principles of WAK (wave-activated stiffness [K]) test analysis, spectral analysis of surface waves (SASW) method and seismic cone penetration test (SCPT). The WAK and SASW tests were performed by applying an impact load on a circular steel plate of 50 cm diameter in vertical direction. A sledgehammer equipped with a dynamic force transducer was used to produce the impact load. The force time signal from the dynamic loading (input) and acceleration time signals from vertical accelerometers (output) were recorded during the tests. The dynamic stiffness of soil was obtained by considering the soil to be vibrating as a single degree of freedom (SDOF) system. The SCPT was performed by measuring the travel times of body waves propagating between a seismic shear wave source at the ground surface activated at each level and an array of geophones. The dynamic soil stiffness obtained from WAK and SASW tests compared very well with the SCPT test.

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Automated Inversion Procedure for Spectral Analysis of Surface Waves

Cited by 123 publications

References 25 publications

Evaluation of SASW Test Configurations and Associated Data Uncertainties in Generating Site Specific Dispersion Curves

Evaluation of SASW Test Configurations and Associated Data Uncertainties in Generating Site Specific Dispersion Curves

Performance Related Specifications (PRS) for Concrete Pavements in Indiana, Volume 2: Technical Report

Dynamic Soil Stiffness Between WAK, SASW and SCPT Tests

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