Current studies have shown that undisturbed and reshaped soils have an important influence on dynamic nonlinear properties, but few studies have investigated the effect of their difference on the seismic response of engineering sites. In response to this problem, experimental analyses were conducted on the dynamic shear modulus and damping ratio of undisturbed and remolded silty clay through dynamic triaxial tests. Using the equivalent linear method built into the DEEPSOIL software, the seismic response of the two borehole sites was numerically simulated, and the specific impact of the dynamic parameters of undisturbed and remolded silty clay on the seismic response was quantitatively evaluated. The results show that: The dynamic shear modulus ratio and damping ratio of the reshaped silt clays are higher compared to those of the undisturbed silt clays, especially after shear strains greater than 10-4. For the seismic response results of the site, the reshaped silt clays significantly underestimates the peak ground acceleration, peak horizontal displacement and response spectra of the site, and the degree of underestimation increases with the increase of the peak input ground motion, with the maximum relative error of up to 60%, which is an impact that should not be ignored. Therefore, in the seismic design of the project, the seismic response parameters of the site calculated using the dynamic nonlinear parameters of the reshaped silty clay should be improved appropriately in order to improve the safety of the building structure.
Liu Yan
,
Shi Shuai
,
Liu Bin
. Study on Site Seismic Response of Undisturbed and Reshaped Silty Clay[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(S2)
: 1017
-1024
.
DOI: 10.20174/j.JUSE.2025.S2.58
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