Experimental investigation on pile-soil interaction of monopile under multidirectional load in soft foundation
A 1g large-scale model test was carried out,in order to further study the lateral deformation response and pile-soil interaction mechanism of large-diameter monopile under multidirectional cyclic load.The lateral stress and the deformation response of the pile under different vertical and lateral cyclic load ratios were discussed.Test results showed that applying vertical cyclic loads would increase the development rate of lateral displacement of the monopile.The maximum bending moment appeared at the depth of 2.0 times the pile diameter,and the bending moment of the pile body showed a decreasing trend with the increase of the number of cycles.The position of the maximum soil resistance gradually moved from 1.5 times the pile diameter depth to 2.0 times the pile diameter depth under cyclic load,and the degradation of cyclic soil resistance-pile lateral deformation(p-y)curve mainly occured in the surface soil.Applying vertical cyclic load would increase the initial stiffness of the pile-soil interface,but it would also accelerate the stiffness degradation of the pile-soil system.Special attention should be paid to the adverse effects of vertical cyclic load on pile displacement and pile-soil interaction under long-term cyclic load in the design of large-diameter monopile for offshore wind turbines.
1g model testmonopilecomplex loadingp-y curvepile-soil interaction
NETL
NSTL
万方数据
维普
