Effect of Randomness of Parameters on Amplification of Ground Motion in Saturated Sedimentary Valley

• Published in: Applied sciences Vol. 13; no. 2; p. 1147
• Main Authors: He, Ying, Liu, Xu, Liu, Zhongxian, Chen, Xueling, Yin, Benchi
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-01-2023
• Subjects: Biot’s theory; Boundary element method; Coefficients; Earthquakes; Emergency preparedness; Environmental risk; Finite element analysis; Flow velocity; Ground motion; indirect boundary element method (IBEM); Methods; Mitigation; Monte Carlo method; Numerical analysis; Permeability; Permeability coefficient; Porosity; Propagation; Randomness; Risk analysis; saturated sedimentary valley; Seismic activity; Seismic hazard; Seismic response; Simulation; Stochasticity; Valleys
• ISSN: 2076-3417; 2076-3417
• DOI: 10.3390/app13021147

Based on Biot’s theory and the indirect boundary element method (IBEM), the Monte Carlo method is utilized to generate random samples to calculate the displacement response of a saturated sedimentary valley under SV wave incidence. The purpose of this paper is to explore the effects of randomness of porosity, permeability coefficient, and geometric shape on the seismic amplification effect of saturated complex sites. It is shown that the change of media porosity in the saturated site with defined boundary has relatively little influence on the ground motion, and the influence of the permeability coefficient is slightly larger. While in the site with a random boundary, the influence of both the porosity and permeability coefficient are significant, which cannot be ignored. The conclusion plays an important guiding role in earthquake disaster prevention and mitigation, such as seismic risk analysis and earthquake microzonation in saturated sedimentary valleys.