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采用数值模拟方法,研究动剪切模量比和剪切波速对地震动的影响问题,并以对地表加速度反应谱影响为标准研究动剪切模量比变化与剪切波速变化间的对等关系,同时建立了等价关系式,分析中考虑了场地类别、场地遭遇地震强度和地震输入波型的影响。结果表明:①动剪切模量比误差和剪切波速误差对地震动都有着重要影响,在土体强非线性和软弱场地中影响更为强烈,实测的动剪切模量比和剪切波速比真实值低时较比真实值高时对地表反应谱影响更大,三类场地0.1g地震输入时动剪切模量比6%误差或剪切波速25%误差的影响已经不可忽视;②对不同的场地类别、场地地震烈度和地震输入波情况,动剪切模量比单独变化与剪切波速单独变化对反应谱的影响都具有对等关系;③动剪切模量比误差对地震动的影响程度要大于剪切波速误差,二者对地表反应谱的敏感性相差3～5倍,绝对误差相同时动剪切模量比降低情况下与剪切波速的敏感程度相差更大。
The influence of dynamic shear modulus ratio and shear wave velocity on ground motion is studied by using numerical simulation method. Based on the influence of surface acceleration response spectrum, the reciprocal between the dynamic shear modulus ratio and the change of shear wave velocity Relations, at the same time establish the equivalence relation, taking into account the type of site, the seismic intensity encountered by the site and the influence of the input wave form of the earthquake. The results show that: (1) The dynamic shear modulus ratio error and the shear wave velocity error have an important influence on the ground motion, and are more strongly affected in the strong nonlinear soil and soft soil. The measured dynamic shear modulus ratio and shear When the velocity ratio is lower than the true value, the influence on the surface response spectrum is greater than the true value. The influence of the dynamic shear modulus ratio 6% error or the shear wave velocity 25% error on the input of 0.1 g earthquake in three kinds of sites can not be neglected. ② For different site types, site seismic intensity and seismic input wave conditions, the dynamic shear modulus has a reciprocal relationship with the response spectrum when compared with the single change and the shear wave velocity alone. ③ The ratio of dynamic shear modulus to error The degree of influence of ground motion is greater than that of shear wave velocity. The sensitivities of the two to the surface response spectrum are 3 to 5 times lower than those of the shear wave velocity. .