Calculation of seepage force around buried pipelines under nonlinear waves

Due to the effect caused by nonlinear shallow waves, the nonlinear wave load has a great influence on the shallow buried pipelines. The wave pressure on seabed surface changes periodically with the propagation of waves, and it will further pass to the sea-bed, so the seepage force around pipelines will change over the propagation of waves. In order to ensure their stability, we need to study the seepage pressure around the pipelines. Based on the Biot consolidation theory and the first-order solitary wave theory, the distribution of seepage force caused by nonlinear waves around the buried pipelines in shallow water is studied, and the relevant analytic solution is derived and compared with the existing test and the numerical results. The calculated results show that the seepage force around the buried pipelines exhibits a sinusoidal distribution under the effect of solitary waves, and they agree well with the test ones. Since the seepage forces based on different wave theories have great differences, the corresponding wave theory should be chosen according to the sea conditions in practical engineering.