砂砾土抗液化强度的小型土箱振动台试验研究

发布时间：2019-01-09 06:07

【摘要】：近来数次大地震中出现大量的砂砾土液化震害,饱和砂砾土的地震液化问题越来越引起重视。针对砂砾土的抗液化强度问题,开展了4种砾含量、3种相对密度情况下,饱和砂砾土的小型土箱振动台试验研究。为获得较为合理的抗液化强度结果修正了由加速度计倾斜产生的加速度时程漂移,并描述了土体中加速度和动孔压发展特性。饱和砂砾土的抗液化强度结果显示:含砾量和相对密度对饱和砂砾土的抗液化强度均有明显影响。饱和砂砾土的抗液化强度随着含砾量和相对密度的增加明显增大,增大的趋势越来越明显,且明显高于相近相对密度的饱和砂土的抗液化强度。
[Abstract]:Recently, a large number of sandy gravel soil liquefaction damage occurred in several large earthquakes, and the problem of seismic liquefaction of saturated sandy gravel soil has been paid more and more attention. Aiming at the liquefaction resistance of sandy gravel soil, the shaking table test of small soil box of saturated gravel soil was carried out under the condition of four kinds of gravel content and three relative densities. In order to obtain more reasonable results of anti-liquefaction strength, the acceleration time-history drift caused by the tilt of accelerometer is corrected, and the characteristics of acceleration and dynamic pore pressure development in soil are described. The results of liquefaction resistance of saturated gravel soil show that the content of gravel and the relative density have obvious influence on the liquefaction resistance of saturated gravel soil. The liquefaction resistance strength of saturated gravel soil increases obviously with the increase of gravel content and relative density, and the increasing trend is more and more obvious, and it is obviously higher than that of saturated sand soil with similar relative density.
【作者单位】：江苏科技大学土木工程与建筑学院;南京工业大学岩土工程研究所;中国地震局地球物理研究所;
【基金】：国家自然科学基金项目(41172258) 国家重点基础研究发展计划(“973”计划)项目(2011CB013601) 国家科技重大专项项目(2011ZX06002-010-15) 国家自然科学青年基金项目(51309121) 江苏省基础研究计划青年基金项目(SBK20130463)
【分类号】：TU435

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