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Development of Inversion Analysis Framework to Determine Nonlinear Shear Moduli of Soils In Situ  

Ahn, Jae-Hun (놀스캐롤라이나 주립대)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.8, no.3, 2008 , pp. 87-93 More about this Journal
Abstract
The large scale shaker can be employed to measure linear and nonlinear shear moduli of soils in situ as a function of shear strain. The method involves applying dynamic loads on a surface foundation measuring the dynamic response of the soil mass beneath the foundation with embedded instrumentation. This paper focuses on the development of a framework of the inverse analysis for the interpretation of test data to estimate linear and nonlinear shear moduli of soils along with the necessity of the inverse analysis. The suggested framework is based on the nonlinear least squares but it uses two iterative loops to account for the nonlinear behavior of soil that sensors are not located. The validity of the suggested inversion framework is tested through a series of numerical parametric studies. An example use of the suggested inversion framework is also shown. Because the field condition may affect the accuracy of suggested method, it is important to conduct a preliminary inverse analysis to quantify the discrepancy between the estimated modulus and the baseline.
Keywords
Nonlinear shear modulus; dynamic soil property; inverse analysis; in situ test;
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