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Dynamic shear modulus of undisturbed soil under different consolidation ratios and its effects on surface ground motion |
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| Authors: | Jing Sun Maosheng Gong Xiaxin Tao |
| Institution: | 1. Institute of Civil Engineering, Heilongjiang University, Harbin, 150080, China 4. Institute of Civil Engineering, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, China 2. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, 150080, China 3. School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China |
| Abstract: | The dynamic shear modulus for three types of undisturbed soil under different consolidation ratios is presented by using the resonant column test method. Its effects on surface ground motion is illustrated by calculation. The test results indicate that the power function is a suitable form for describing the relationship between the ratio of the maximum dynamic shear modulus due to anisotropic and isotropic consolidations and the increment of the consolidation ratio. When compared to sand, the increment of the maximum dynamic shear modulus for undisturbed soil due to anisotropic consolidation is much larger. Using a one-dimensional equivalent linearization method, the earthquake influence factor and the characteristic period of the surface acceleration are calculated for two soil layers subjected to several typical earthquake waves. The calculated results show that the difference in nonlinear properties due to different consolidation ratios is generally not very notable, but the degree of its influence on the surface acceleration spectrum is remarkable for the occurrence of strong earthquakes. When compared to isotropic consolidation, the consideration of actual anisotropic consolidation causes the characteristic period to decrease and the earthquake influence factor to increase. |
| Keywords: | dynamic shear modulus consolidation ratio undisturbed soil resonant column test surface ground motion |
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