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在设计承受动力荷载的地基基础和评价场地地震效应时,一个重要的环节就是要掌握动力荷载作用下土的特性(以动态剪切模量G_d、阻尼比λ和动抗剪强度等参数表达)。土的动力性能是非线性的,它取决于动静荷载条件,以及土中所形成的应力应变场,所以室内和野外原位测试工作,应得出动力参数及其随应变而变的规律。本文扼要地叙述采用振动单剪仪测定G_d和λ的试验程序,
When designing the foundation of the foundation subjected to dynamic loading and evaluating the seismic effect of the site, an important step is to grasp the characteristics of the soil under dynamic loading (expressed by parameters such as dynamic shear modulus G_d, damping ratio λ, and dynamic shear strength). . The dynamic properties of soil are non-linear. It depends on the dynamic and static loading conditions and the stress and strain fields formed in the soil. Therefore, in-house and field in-situ testing work, the dynamic parameters and the law that changes with strain should be obtained. This article briefly describes the test procedure for measuring G_d and λ using a vibration single shear meter.