桥梁工程中LDBPs的群桩工作特性

将杆系结构有限单元法与荷载传递迭代法相耦合,形成一桩基沉降分析计算的混合法．采用近似解析解中Randolph and Worth’Model和双曲线模型相结合,模拟桩身与桩周介质边界上剪切滑移,桩间相互作用,采用弹性理论Mindlin方程解答计算,并考虑了桩间“加筋与遮帘”作用,编制了群桩沉降分析计算程序GPSAI,通过计算分析,对刚性承台下群桩桩数、桩长、桩间距和桩土模量比等群桩工作特性的影响进行了系统研究．该方法和成果,可以作为今后群桩沉降分析研究的参考．

Some Behaviors of Pile Group for LDBPs in Bridge Engineering

One hybrid method of finite element analysis of rod structure coupling with load transfer approach for piles groups settlement was established. The behavior of shear-diaplacement on the boundary between pile and ground was determined by the Randolph and Worth' Model in the approached closed form solution, coupling with the hyperbolic model. The action of pile groups was evaluated from the Mindlin equation solution,and adjusted by the "restraint" action approximately. The program GPSA1 relevant to that narrated above for predicting settlement of piles groups had been written triumphantly. The influences of number of piles, the pile length, the space between piles, and the pile-soil relative stiffness factor on the characteristic of pile groups ware analyzed in a systematic way. The documentation gives guidance for future research in the analysis of piles groups settlement.