Study on the Variation of Ground Motion Parameter along Depth

Abstract eng:
A soil layer seismic response test is applied in an engineering profile. El-centro wave is chosen as the input wave in the test, its peak acceration is adjusted as 10gal、 20gal、 30gal、 50gal、 75gal、 100gal、 150gal、 200gal、 250gal、 300gal、 350gal、 400gal during calculating. The peak accelerations and the maximal shear strains of the profile in different depth are calculated, the peak accelerations and their amplification coefficients on the surface and nearby the base are also calculated. Conclusions can be drawn from the calculation results: firstly, with the input wave becoming more and more stronger, the amplification coefficients become more and more smaller and even less than 1, the ones nearby the base become more and more lager, and the peak accelerations appear a saturation state when input wave is lager. Secondly, the peak accelerations become smaller and smaller first and then larger and larger from the base to the surface on the whole. Thirdly, the maximal shear strains become lager fastly nearby the surface with the depth increasing, when the input wave increase to a certain degree. The maximal shear strains and their curve figure along the depth do not change even if the input wave changes.

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