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码头桩基在波浪循环荷载的长期作用下,桩周一定范围的土体会出现强度弱化,进而会一定程度的影响基桩竖向承载力。该文首先通过室内GDS动态三轴仪对天津港码头地基土样作用模拟的波浪循环荷载,研究不同深度土体受到不同幅值的循环动应力荷载作用后其强度的折减规律。然后通过ABAQUS有限元软件计算模拟码头桩基在上部既有结构相互作用的同时,桩身上部受波浪循环荷载,桩周土动应力的分布规律。结合室内动三轴试验结果,计算得到该码头桩基在波浪循环荷载作用下桩周土体弱化的影响深度约为5m,桩周土体的强度折减率最大达到85.3%,码头桩基竖向承载力的折减率为5.73%。
Under long-term cyclic load of wharf, the strength of the soil in a certain range around the pile will be weakened, which will, in turn, affect the vertical bearing capacity of the pile. In this paper, the indoor cyclic loading of Tianjin Docks is simulated by indoor GDS dynamic triaxial apparatus, and the strength reduction of the soil under different cyclic loads under different amplitude is studied. Then the ABAQUS finite element software was used to simulate the distribution of dynamic stress in the upper part of the pile subjected to wave cycle load and the pile at the same time as the existing structural interaction in the upper part of the pier. According to the results of indoor dynamic triaxial tests, the influence of the weakening of pile body around the pile around the pile under wave cyclic loading is calculated to be about 5m. The strength reduction ratio of the soil around the pile reaches a maximum of 85.3%. The pile foundation of the pier The reduction rate to the bearing capacity is 5.73%.