Study On Dynamic Response Of Steel Pipe Pile-Soil Interaction Under Random Wave Load

With resources becoming scarce, more and more attention draw to energy problem inthe Marine environment, safety during the construction and operation of offshorestructures is an urgent problem to be solved. The environmental load of offshore structuressubjected while use and construction is a complex dynamic load caused by wind, wave,current tidal, earthquake and other natural environment, wave load is the most basic, themost frequent load of this. There is a great engineering significance of the research toanalysis the dynamic action of random wave load on structure-seabed soil.Steel pipe pile due to their high strength, short construction period and simpleoperation, also the price of steel pipe pile is relatively low, so lots of projects using steelpipe pile as the foundation. Due to the marine environment is complex, wave load changein moment, so according to the actual situation to choose the appropriate specification ofChina’s waters spectrum. The random waves have a simplified linear and compilingcomputer program. Selecting the cut off frequency and the effective wave height based onthe observed conditions of marine environment. Using the method named equal frequencyto simulate random wave loads, applying random waves in horizontal direction andvertical direction at the same time.To the flange of the boundary, and simplify the dynamic load of upper flange toequivalent. Numerical simulation of the analysis model, establishment interface model andcompiled computer programs of the soil parameters reduction in the process of dynamicpower and made the suit choice of the damping factors forms. Through the initial balance,fluid balance, the pile dynamic balance and other simulated courses to simulate thedynamic response of steel pipe pile and soil system under random waves load impact. Bysimulating different effective frequency wave dynamic role in200s, extracted pore waterpressure and interface shear stress, recorded such different deep points of vertical effectivestress and horizontal displacement of pile top, made the research on the dynamic responseof pile-soil in the dynamic process, analyzed the effect which soil to pile, the extrusion ofpile to soil and the reaction of pile’s own in dynamic process. Based on numerical calculation, analyzed dynamic response of steel pile-soil system and analyzed therelationship of rule change with seabed depth, soil parameters, the distance between soiland pile, by adjusting the effective circular frequency of random wave to numerical themost dangerous conditions. The above research can provide guidance and technicalsupport for engineering design work and production of steel pipe piles under the actualengineering background.