CAJ | 학술논문

　　导管架海洋平台群桩基础的桩头约束是一种弹性约束。针对具有弹性约束桩头的群桩，提出了一种利用非线性地基梁群桩模型，通过迭代计算确定导管架平台群桩p-y数据的方法。该方法首先依据单桩p-y曲线，利用具有弹性约束桩头的群桩模型，计算桩头在总荷载作用下的水平位移；再利用 Poulos 相互作用系数确定由于群桩相互作用引起的桩头附加水平位移，将总荷载作用下的桩头水平位移与桩头附加水平位移叠加后的结果作为迭代计算的初始桩头水平位移。然后，依据桩头荷载与初始桩头水平位移，通过对单桩p-y数据的标定，确定其修正系数Ym，进而得到与第1次计算对应的群桩p-y数据。在接下来的迭代计算中，利用每次更新后的Ym确定该次计算使用的群桩 p-y数据，并据此由群桩计算模型计算桩头位移，通过对单桩p-y数据标定确定相应的Ym，直到第i次与第i-1次计算出的Ym(i)和Ym(i-1)之间相对误差小于允许误差为止。由于该方法考虑群桩效应的p-y数据，且借助具有弹性约束桩头的群桩模型进行分析，从而使计算结果能客观反映具有弹性约束桩头群桩之间的相互作用与变形特性。
　　도관가해양평태군장기출적장두약속시일충탄성약속。침대구유탄성약속장두적군장，제출료일충이용비선성지기량군장모형，통과질대계산학정도관가평태군장p-y수거적방법。해방법수선의거단장p-y곡선，이용구유탄성약속장두적군장모형，계산장두재총하재작용하적수평위이；재이용 Poulos 상호작용계수학정유우군장상호작용인기적장두부가수평위이，장총하재작용하적장두수평위이여장두부가수평위이첩가후적결과작위질대계산적초시장두수평위이。연후，의거장두하재여초시장두수평위이，통과대단장p-y수거적표정，학정기수정계수Ym，진이득도여제1차계산대응적군장p-y수거。재접하래적질대계산중，이용매차경신후적Ym학정해차계산사용적군장 p-y수거，병거차유군장계산모형계산장두위이，통과대단장p-y수거표정학정상응적Ym，직도제i차여제i-1차계산출적Ym(i)화Ym(i-1)지간상대오차소우윤허오차위지。유우해방법고필군장효응적p-y수거，차차조구유탄성약속장두적군장모형진행분석，종이사계산결과능객관반영구유탄성약속장두군장지간적상호작용여변형특성。
The pile group head of jacket platforms is elastic constrained head. According to the elastic constrained head, a method to determine p-y data of jacket platform pile groups using the nonlinear foundation beam model of pile group is proposed. The lateral displacement of pile head is first determined using the pile group model with the elastic constrained head and p-y data of a single pile under total loads for the method. Additional lateral displacements due to pile group interactions are determined using Poulos’s interaction factors. The superposition result of above two calculations is taken as the initial lateral displacement of pile head of iterative calculations. The modified factor, Ym, of p-y data of the pile group associated with the first calculation is determined by calibrating p-y data of a single pile based on pile head loads and initial lateral displacement. For following calculations, p-y data of pile group associated with each iteration are determined using the updated Ym and then are used to determine the lateral displacement of pile group head and new Ym until the relative difference between Ym(i) and Ym(i-1) associate with the iterations i and i-1 is less than the tolerance. Because the method uses the p-y data considering pile group effects and the pile group model with the elastic constrained head to analyze the pile group interactions, results can objectively reflect interactions of jacket platform pile group and the deformation behavior of pile group with the elastic constrained head.