Nonlinearities induced by free surface effects and viscous drag force are also included in this model.
还包括自由表面效应、粘性力等因素引起的非线性。
The free surface effects of random wave forces are studied by means of nonlinear spectral analysis and a new calculating model is proposed.
应用非线性谱分析法对随机波浪载荷的自由表面效应进行了研究，提出了一种新的计算模型。
The time and spatial effects of excavation considering variation of seepage free surface outside of foundation pit were further investigated.
进一步研究了考虑坑外渗流自由面随时间变化的基坑工程时间效应和空间效应。
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