依托于济南地铁拟建场地的地震安全评价工作,开展了土体的动三轴试验,并对试验成果进行了统计分析。得到如下结论:对于同一层土,随着剪应变的增大,动剪切模量比减小,阻尼比增大,不过试验数据的离散性较大;采用土体动力本构模型对试验结果进行拟合分析时,拟合效果较好;与其他地区的研究成果相比,济南市区土体的动剪切模量比较大,阻尼比较小,说明土体的动力性质较好,对抗震有利。研究成果既有利于认识济南市区土体动力特性的特殊性,又可为工程抗震设计提供参考。
Abstract
With seismic evaluation in the construction of Ji'nan subway as research background, dynamic triaxial tests of typical soils are carried out and the test results are statistically analyzed. Results imply that, in the same soil layer, with the increase of shear strain, dynamic shear modulus ratio decreases, whereas damping ratio increases. However, the test data is discrete. Dynamic constitutive model of soil is of good effect in fitting the test results. Compared with research results in other areas, the dynamic shear modulus ratio of soils in Ji'nan City is large, while damping ratio is small, indicating that the dynamic properties of soils in Ji'nan is favorable for earthquake resistance. This study not only helps to understand the dynamic properties of soils in Ji'nan, and also provides reference for engineering seismic design.
关键词
动三轴试验 /
动剪切模量比 /
阻尼比 /
土体动力本构模型 /
济南
Key words
dynamic triaxial test /
dynamic shear modulus ratio /
damping ratio /
dynamic constitutive model of soil /
Ji'nan City
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基金
山东省住房和城乡建设厅科研项目(SDGP2015-168-1)
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