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场地分类的新指标――土层等效周期

, PP. 228-235

Keywords: 场地分类指标,土层等效周期,土层结构,场地基本周期,土层等效剪切波速

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Abstract:

提出以土层等效周期替换土层等效剪切波速进行场地分类的思想,以克服土层等效剪切波速指标的局限性。以我国双参数场地分类法为例,讨论土层等效剪切波速在实际工程应用中造成的不合理场地分类现象,论证场地基本周期区分场地动力特性的合理性,在场地基本周期概念的基础上延拓提出土层等效周期的概念,通过调整60个实际工程场地的土层结构,研究了土层等效周期和特征周期的关联性。结果表明随计算深度内土层结构的改变,各场地的土层等效周期均变大,特征周期亦随之增大,其中,Ⅰ类场地二者变化不明显,Ⅱ类、Ⅲ类、Ⅳ类场地的二者增大明显,即土层等效周期与特征周期呈现有较强的关联性;而土层等效剪切波速及场地类别并不随计算深度内土层结构改变而改变。土层等效周期比土层等效剪切波速更适合作为场地分类指标。

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