饱和粉土液化特性的大型振动台模型试验研究

Large scale shaking table test study on liquefaction of saturated silty soil

京沪高速铁路徐沪段路基的粉土粘粒含量少于1.5%、粉粒含量约为80%,在强烈地震作用下存在着液化可能性.为充分研究这一饱和粉土地层的液化特性,本文作者利用大型地震模拟振动台,进行了模拟自由场地饱和粉土的地震液化模型试验,试验结果再现了自然地震触发的粉土液化的各种宏观震害现象,揭示了饱和粉土的地震液化规律和特征。试验结果为京沪高速铁路徐沪段路基的抗震设计提供了参考依据。

This paper presents the study results of large scale shaking table tests on liquefaction of saturated silty soil. The contents of clay grains and fine silt grains are approximate to 1.5% and 80% , respectively, in the saturated silty soil layer under the roadbed of Xuzhou-Shanghai section of the prospected Beijing-Shanghai high speed railway. In order to study the potential hazard of liquefaction of such silty layer under strong earthquake loadings, free field large scale shaking table model tests were carried out to investigate the liquefaction behavior of the saturat- ed silty soil. The experimental results approximately showed several macroscopic phenomena and characteristics of site liquefaction under earthquake loadings, and the dynamic behavior of saturated silt. The test results provide an efficient reference for the seismic design of railway roadbeds when the liquefaction of saturated silty soil is taken into account.