Abstract

Evaluation of scour depth is essential but challenging for the design and surveillance of bridges. The current engineering practice is primarily based on empirical equations. However, without considering geomechanics concepts, these methods are not always reliable, especially when utilised under different geological conditions. This paper introduces a new approach based on the geomechanical equilibrium concept, i.e. erosive force versus the erosion resistance. This analysis procedure incorporates the geomechanics concepts, and it can be solved by coupling computational fluid dynamics and soil particles. Based on numerical investigations considering soil particles, cases of scour prediction considering soil layer distributions have been carried out. With this concept, scour processes in layer-distributed soils and under different flood consequences have been analysed. It can be applied to investigate the scour process considering layered soils with different erosion resistance distributions and various hydraulic conditions. It is found that the proposed model can provide reliable results and explain a few scour phenomena, which are difficult to explain with traditional models.

摘要

冲刷深度的评估对于桥梁的设计和监测至关重要，但也具有挑战性。当前的工程实践主要基于经验方程。然而，如果不考虑地质力学概念，这些方法并不总是可靠的，尤其是在不同地质条件下使用时。本文介绍了一种基于地质力学平衡概念的新方法，即冲蚀力与抗冲蚀性。该分析过程结合了地质力学概念，可以通过耦合计算流体动力学和土壤颗粒来解决。基于考虑土壤颗粒的数值研究，已经进行了考虑土壤层分布的冲刷预测案例。有了这个概念，分析了分层土壤和不同洪水后果下的冲刷过程。它可用于研究具有不同抗侵蚀分布和各种水力条件的层状土壤的冲刷过程。发现所提出的模型可以提供可靠的结果并解释一些用传统模型难以解释的冲刷现象。