The Study of Tn-Situ Pore Pressure Monitoring of Seabed Soil Under Wave Loading

摘要

In this study, the field monitoring of the pore water pressure of the seabed soil under the wave action is investigated. From the coastal geotechnical engineering viewpoint, the wave-induced pore water pressure of seabed under irregular wave action and wave height in-situ were discussed, and also comparison with the laboratory simulation test to understand the relationship properties. The monitoring of pore water pressure system is jointed with the run-up of wave monitoring pile system in Golden Coast of Tai-Nan. In order to obtain the profile of various pressures induced by wave loading, the monitoring depth set up from -0.5m to -3.5m in step of lm below seabed. Concerning above the monitoring of wave induced the pore water pressure within the seabed, the results of calculation of Yamamoto wave theory and the cyclic triaxial tests in laboratory could indicate that by using of the wave theory formulae derived under limitless depth seabed and pore water completely saturation, to evaluate the seabed of dynamic pore water pressure after the wave through the break zone. It found that the dynamic pore pressure induced by wave loading is underestimated tendency. But the decay curve of △u_(field)/ P compared with the monitoring data and theory calculation have same tendency. The ratio of △u_(field) P is decreased as depth dimensionless of z/L increasing. The monitoring results and analysis could be provided to the reference of the related seabed stability and coastal prevention disaster.