The change rules of dynamic response on subgrade under the rainfall infiltration
CHEN Shanxiong，SONG Ruijun，YU Fei，LI Jian
(State Key Laboratory of Geomechanics Geotechnical Engineering，Institute of Rock and Soil Mechanics， Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
It is significant to study the change rules of dynamic response on high speed railway subgrade under the condition of rainfall infiltration，which can identify the potential disease and guarantee the stability of subgrade. Therefore，the change rules are discussed through the 1∶1 large-scale model test. Research suggests the acceleration and dynamic stress of the softening condition are both reduced compared with the normal condition. The more close to the subgrade surface，the reduction is more obvious，and the reduction of the acceleration and dynamic stress are reached about 50% on the subgrade surface. In the softening condition，the dynamic stress is slightly increased because the interface effect appears between the soft and hard interface，and it is different from the attenuation rules of the acceleration. The dynamic stress propagation on subgrade appears stress diffusion phenomenon that causes the dynamic stress amplitude on the lower part of the subgrade is larger than the upper. With the increase of the excited frequency，the acceleration attenuation is increased first and then decreased in the same depth，and reaches the maximum value at 19.1Hz. The dynamic stress is increased gradually from the surface of subgrade 0.35m，with the similar acceleration law under 0.35m.
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2017, Vol. 36 
