Abstract In engineering construction, the elastic-slip interface often exists around the tunnel. An elastic-slip interface model is proposed to analyze the dynamic response of underwater convey tunnel, and the surrounding soil is assumed to be saturated poroelastic medium. The reflected, refracted and scattered waves in the free surface water, the surrounding soil medium and the tunnel are expressed by wave function expansion method. Based on Biot’s dynamic theory, an elastic-slip interface is developed to analyze the scattering of P and SV waves around the tunnel. The interface coefficients (normal and tangential spring coefficients and slip coefficient) are introduced to analyze the elastic-slip interface effect on the dynamic stresses under different wave frequencies. It can be concluded that the effect of normal spring coefficient is greater than that of tangential spring coefficients. The interface effect in the region of low frequency is greater than that of high frequency. The interface effect under different surface water depths and embedded depths of tunnel is also examined. Comparison with existing numerical results validates this dynamic model.

中文翻译：

---

弹滑界面对平面波作用下饱和多孔弹性土水下输送隧道动力响应的影响

摘要 在工程建设中，隧道周围常存在弹性滑移界面。提出了一种弹性滑移界面模型来分析水下输送隧道的动力响应，并假设周围土体为饱和多孔弹性介质。自由地表水、周围土壤介质和隧道中的反射、折射和散射波用波函数展开法表示。基于Biot的动力学理论，开发了一个弹性滑移界面来分析隧道周围P波和SV波的散射。引入界面系数（法向和切向弹簧系数和滑移系数）来分析弹滑界面对不同波浪频率下动应力的影响。可以得出结论，法向弹簧系数的影响大于切向弹簧系数的影响。低频区域的界面效应大于高频区域的界面效应。还研究了不同地表水深度和隧道埋设深度下的界面效应。与现有数值结果的比较验证了该动态模型。