弱震区土层对基岩峰值加速度放大效应的试验研究

Experimental Study on the Amplification Effect of Bedrock PeakAcceleration Caused by the Soil Layer in a Weak Shock Region

摘要:

以人工爆炸波作为震源,通过现场试验获得基岩和土层场地爆炸波地震动时程,分析场地覆盖层厚度对基岩地震动峰值加速度和地震动持时的放大效应。试验结果表明:土层对基岩地震动有放大作用,基岩峰值加速度放大系数受覆盖层厚度和土层结构的共同作用影响;地震动持续时间随覆盖层厚度的增加而显著增加,受覆盖层土层结构影响不显著。

Abstract:

Using an artificial blast wave as the seismic source, the blast-induced ground motion time histories of both rock and soil sites were acquired by field experiments. The effects of soil layer amplification on peak ground acceleration and ground motion time histories were analyzed. The test results show that the soil layers amplify earthquake motion and that the amplification ratios are influenced by the depth and the construction of the soil layer. The depth of a soil layer has a large effect on the ground motion time history, but the construction does not.