Much destruction would be caused by vibration in various natural disasters.The dynamic characteristic of sand

especially liquefaction characteristic

has been studied for a long time

while the history of the study of dynamic characteristic of silty soil is relatively short.Liquefaction is known to be caused by earthquake shaking

with the state of soil changing from solid to liquid.Silty soil is one of the engineering soils in nature of special interest

with distinct characteristics from those of sand.Earthquake-induced settlement caused by silty soil liquefaction is most dangerous.Based on sympathetic vibration tests of Yun-Nan silty soil

G/G

max

～γ/γ

r

curve and D～γ curve are obtained after being normalized

which then is analyzed and fitted by modifying hyperbola model.Based on dynamic triaxial tests

we obtain the relative curve between dynamic strength and vibration number of failure for different consolidation pressure

which accords with power hypotaxis prefera

bly.We can also obtain the relative curve between dynamic strength and vibration number of failure for different consolidation ratio

which accords with hypo-twain parabola better.By analyzing the trial curve of pore pressure and vibration number of failure for different consolidation pressure

we assure that it can be fitted by exponential function.All these analysis can be used as a reference for computation and analysis.