近海锤击沉桩桩位碰撞三维数值模拟

为解决近海桩位碰撞问题、了解桩位碰撞对邻近土体振动的影响,基于FLAC3D建立了三维非线性数值模型,模型中加入了吸收边界条件以避免在边界发生不真实的波反射,同时为更真实地反映近海土体在桩位碰撞情况下的动力响应考虑了土体的动力固结和非线性,并在桩土之间建立了Goodman接触,对近海桩位碰撞时土体的振动情况进行了三维数值模拟。结果表明,桩位碰撞会对周围土体的振动产生严重的影响,并可能导致邻近地下结构的损伤。

Three Dimensional Numerical Analysis of Pile Collision During Offshore Pile Driving by Hammer

In order to solve the problem of pile colliding and explore the influence of pile colliding on the vibration of soil adjacent to the pile, three-dimensional nonlinear numerical model was presented based on FLAC3D. Meanwhile, absorbing boundary conditions were used to avoid unreal wave reflection. The nonlinear behavior and dynamic consolidation of the soil were accounted for more really reflecting the dynamic response caused by offshore pile collision. Goodman contact was established between the pile and soil to simulate the interaction between the pile and soil more reasonably. The results indicate that the offshore pile collision would result in intensive the impact on the vibration of soil, which may cause damage of adjacent underground structures.