一、前言各种震动源(地震、爆破、动力设备等)所产生的最明显的效应就是引起地面的振动,从而引起构筑物的振动。在岩土力学中,特别是对各种震动效应进行分析时,一般都必须将岩土的一些动力学参数引用到计算中去。因此,弄清楚构筑物场地下动剪切模量值的垂直分布,对预估地震时的地面运动,进行抗震设计是有益的。反映地基土抗剪强度的动剪切模量值G_d是采用公式G_d=PV_s~2计算的。(ρ——土 I. INTRODUCTION The most obvious effect produced by various vibration sources (earthquake, blasting, power equipment, etc.) is the vibration of the ground, which causes the vibration of the structure. In geotechnical mechanics, in particular when analyzing various vibration effects, it is generally necessary to refer some of the geodynamic parameters to the calculation. Therefore, it is useful to understand the vertical distribution of the dynamic shear modulus values ​​at the site of the structure and to estimate the ground motion during the earthquake. The dynamic shear modulus value G_d, which reflects the shear strength of the foundation soil, is calculated using the formula G_d=PV_s~2. (ρ - soil