Detection method of scour depth of soil around marine pile foundation

Abstract

The invention discloses a method for detecting scouring depths of a soil body around a marine pile foundation. The method comprises the steps: (1) a pile-soil system is built; (2) the pile foundationis divided into n joints through a concentrated mass method to be numbered, the joints are connected through massless elastic rods with the length being d, each joint and a lower connecting rod serveas a unit, and the rod length d serves as the unit thickness; (3) the soil body around the foundation is layered, the thickness of each layer is the same as the unit thickness, namely d, the soil bodyaround the foundation is simplified to be massless spring constraint around the joints, and the elastic coefficient is determined; (4) an overall rigidity matrix and a mass matrix under the pile-soilsystem are built; (5) the inherent frequency and vibration modes of all orders of the pile foundation under the different scouring depths are detected; and (6) the rigidity correction coefficient isobtained through a cross-model and cross-mode method (CMCM method), the joints, namely damaged units, corresponding to mutation positions of the correction coefficient are found, the number of the units between the damaged units and pile foundation units on the mud surface is determined, and the range of the scouring depths is determined by multiplying the number of the units and the unit thickness.

Description

technical field [0001] The invention relates to the field of pile foundation stability analysis and disaster prevention and mitigation of offshore wind turbine single pile foundations, in particular to a method for detecting the scour depth of soil around marine pile foundations. Background technique [0002] With the scarcity of land resources in the 21st century, my country has begun to step up the development and utilization of marine resources. However, the marine environmental conditions are extremely harsh, the waves near the sea surface are rough, and the waves near the seabed are surging, which will cause very serious soil erosion around the foundation for offshore oil production platforms and offshore wind turbine installations with pile foundations as the main foundation, seriously threatening the platform and The stable operation of wind turbines poses a huge threat to property and life. [0003] Since the scour phenomenon occurs on the seabed, it is very difficu...

AI Technical Summary

Problems solved by technology

However, the first limitation of this method is that it only conducts erosion analysis for a certain area; second, it is empirical and requires a large amount of on-site observation data, which is time-consuming, laborious, and costly; third, it cannot perform real-time monitoring

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