natural grounding meaning in English

自然接地

Firstly , a review about research on seismic reaction of ground and seismic dynamical characteristics of composite foundation is given . after carefully analysis , calculation and comparison , dynamical finite element method is adopted to research seismic resistant dynamical characteristics of composite foundation . five group finite element models of one - dimensional cutting foundation that can reflect different kinds , different improvement schemes and different natural grounds are erected
在对有关地基地震反应和复合地基地震动力特性的研究分析回顾的基础上，通过分析试算比较，确定采用动力有限元方法来研究复合地基的抗震动力特性，建立了能合理地反映不同类型、不同加固方案、不同地基土层条件的复合地基特点的五大类一维剪切型有限元地基模型。