建立了PC C桩复合地基优化设计的目标控制函数和两个约束条件：沉降控制条件和承载力校核条件。
The governing object function and two boundary condition: settlement and foundation bearing capacity are developed in the optimization design of the PCC pile composite foundation.
另外，桩头约束的存在与否，对单桩的横向阻抗函数值也有较大的影响，桩头有约束的阻抗函数值要明显大于无约束的阻抗函数值。
It also should be noticed that whether there is restraint or not on top of the pile will have great influence on the impedance function.
因为压顶圈梁可改变支护桩的内力与位移，二者在空间中相互约束，彼此协调。
Because top beam can change internal force and displacement of supporting pile, and both them restrict and correspond each other in space.
本文方法具有单元划分简单，输入数据少，可以方便地处理不同约束条件和计算桩截面内力等优点。
The method has the advantages of being simple in dividing elements, less in inputting data and convenient in dealing with various boundary conditions and calculating internal forces of piles.
该模型可以考虑变厚度筏板、厚筏、不规则筏板、异形基础及高层建筑主楼和裙楼的整体分析，同时计及地基和桩的水平约束作用。
The element is particularly suitable to analysis the raft with irregular thickness and shape, and the horizontal deformation of raft can also be considered if needed.
采用数值方法对表面约束下的沉桩挤土效应进行了研究。
Based on the numerical method, the effect of squeezing soil due to pile driven in soft clay and restrained on surface was researched.
通过水泥粉喷桩对桩间土的吸水作用及侧限约束作用的分析。
By the analysis of the water absorption action and the lateral restraining action of the cement powder sprayed pile to the inter - pile soil.
其次，引入有限差分法与双参数法，考虑桩底的几种约束情况，推导了锚索桩内力与位移计算方法。
Secondly, by the finite difference method and two-parameter method, this study derives the calculation on the inter force and displacement of the anchor piles.
本文提出的用模拟桩周土约束的剪切弹簧模型来计算单桩刚度，并推导出了相应的理论计算公式。
In the paper, a shear spring model is proposed to simulate the constraint of the soil. Based on this model, the theoretic formula of pile head stiffness is derived.
并对比两种情况下的动测曲线，发现桩顶受约束时桩的动测曲线不仅受桩周土体的影响，还受到上部结构的干扰，并且桩身反射的三维效应更明显。
The dynamic tests of top-restricted concrete pile are affected not only by the soil around pile, but also by the upper structure, and the signal of 3D effect reflected by the pile is stronger.
并对比两种情况下的动测曲线，发现桩顶受约束时桩的动测曲线不仅受桩周土体的影响，还受到上部结构的干扰，并且桩身反射的三维效应更明显。
The dynamic tests of top-restricted concrete pile are affected not only by the soil around pile, but also by the upper structure, and the signal of 3D effect reflected by the pile is stronger.
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