桩

The question of ruined earth pressure cell in test is solved,and the contact pressure between soil and pile is found out by the numerical simulation and distributing law of earth pressure.

通过数值模拟，解决试验中土压力盒损坏的问题，得到地震动激励下桩–土接触压力峰值的数据，并由此分析桩–土接触压力的大小及其分布规律，提出桩基上的支盘是基础减振的主要构件，并承受动荷载，减轻地震波对上部结构的冲击力，同时消耗上部结构反馈给基础的振动能量。承台和桩基两侧的土压力时程曲线呈反向关系，说明基础在同一时间一侧受压，另一侧受拉。

At the same time, the program corresponding to the proposed method is compiled in FORTRAN90, which is used to analyze the influence of several factors on the behaviour of barrettes, including ratio of length to width, ratio of depth to equivalent diameter, ratio of modulus of pile to soil, Poissons ratio, pile soacing etc. Many useful conclusions are obtained from the above analyse.

该方法考虑了壁板桩桩身横截面的非轴对称性，并用FORTRAN语言编制了相应的程序，进而分析了多种因素对壁板桩承载特性的影响，包括长宽比、桩径比、桩土刚度比、泊松比、桩间距等。

In view of a large number of data for dynamic pile test s and theory of onedimensional wave action and wavelet effect,a flow chart of analytical waveshape is drawed up.

通过大量动测桩资料，依据一维杆波动理论与子波效应理论，绘制了动测桩波形分析流程图，建立了桩身缺陷与动测波形特征之间的关系，给动测桩身完整性提供了参考判据。

Making use of ABAQUS, the finite element models are constructed of pile with straight shaft and pedestal pile, with soil modeled as Mohr-Coulomb, piles as elastic, and contact pair built between pile and soil.

利用ABAQUS软件建立等截面桩与扩底桩的有限元分析模型，土体用Mohr-Coulomb本构模型，桩体采用弹性模型，在桩土接触面间设立接触对。

Compared with soil destroyed pattern of vertical force and its controlled factor of bearing capacity,it is concluded that pile capacity and its tip resistence have some difference when soil with the same physical mecanic property is used as natural foundation and pile tip resistent layer.Whereas the middle weathering rod Stratum hasn't this property,that is to say it has the same bearing capacity and pile tip resistence.

文摘：通过竖向荷载下土体的破坏模式及其承载能力控制因素的比较，论述了物理力学性能相同的土层作为浅基础的天然地基与桩端持力层时，承载力值与桩端阻力值应存在一定的差异；而中风化程度的同一岩层作为天然地基与桩端持力层时，不具有这方面的差异性，承载力值与桩端阻力值应该相等。

It is analyzed the pile's curvature of assumption and in situ data. Based on the theory of curved beam, the bent pile is analyzed, and the equations of equilibrium and physics are built. Further, it is given the deflection and moment of the bent pile. Some conclusions are obtained.

通过对发生偏斜试桩的偏斜曲线分别按假设曲线和现场实测进行的对比分析，并把曲桩看作曲梁，根据曲梁理论对偏斜桩体进行了分析，建立了平衡方程和物理方程，分析了曲桩在竖向荷载作用下的变形和弯矩。

In this paper, on the basis of many studies reported in the literature, the effects on bridge pile sare reviewed of the liquefaction induced lateral spread and large ground displacements.

根据国内外文献资料，主要就地震高烈度区液化引起的地面侧向大变形对桥梁桩基的影响的研究现状进行分析，总结了地面大变形引起的震害情况、液化诱发地面大变形的机理及液化大变形的预测方法、桥梁桩基的震害和液化大变形对桥梁桩基的影响、桥梁桩基抗地面大变形的措施，以及存在问题和研究思路。

The majority of piles are designed to support "active" loadings, that is to say, loads from upper structure are directly transferred to the pile foundation by the cap.

通常各类建筑工程中的桩基础主要是主动受荷桩，即上部结构的荷载通过承台传递给下部的桩基础，由桩土间的相互作用来分担上部结构荷载。

3D effect is analyzed and the average velocity of wave propagating in the pile, which mainly influences inverse interpretation, is discussed. Finally, the theory results are verified by model experiment. It is shown that 3D results have the same phase with ID results. The pile radius, the duration of impulse, the ratio of hammer radius to pile radius and shear velocity of the soil around the pile have influences on 3D effect. The best position of receiver is 0.55R from the pile center. The average velocity of wave propagating in the pile reduces due to transversal inertia effect and 3D effect.

结果表明：三维曲线与一维结果在相位特征上一致；波场图直观地反映了波在桩中的传播规律；三维效应与桩径、激振脉冲宽度、相对激振半径及桩周土剪切波速有关；传感器放在0.55R处可以得到干扰较小的信号；三维效应和横向惯性效应的存在会使桩中的波速减小，土的性质对波速影响不大；反演精度与缺陷的性质、激振条件有关。

The main character of the HVS is that, by means of fluctuating oil pressure, the pile-driving force can be changed in a higher frequency, and therefore better vibrating effect can be gained.

液压振动系统的主要特点是在桩机液压系统中的压桩油路产生流体压力变化和波动，从而使沉桩力出现高频的周期变化，产生振动压桩的效果。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。