桩

Based on the stress mechanism with composite foundation and rigid foundation,and the accuracy grade of pile positioning,the author believes that the existing technical standards for pile displacement in soil-cement mixed pile foundation are unreasonably rigorous.

基于复合地基和刚性桩基的受力机理、桩的定位精度分析，认为规范中对水泥土搅拌桩地基的桩偏位规定过于苛刻，参照混凝土灌注桩及其他复合地基桩偏位规定，提出对水泥土搅拌桩偏位作适当修正。

By using finite element method,the pile group effect coefficient of soil resistance under pile cap is analyzed for the composite pile foundation.

利用三维弹塑性有限元方法，对复合桩基承台底土阻力群桩效应系数进行了分析；根据分析，编制了相应的有限元程序；应用该程序研究了承台宽与桩长之比、桩距、桩数、土类等对承台底土阻力群桩效应系数的影响。

Accord-ing to engineering example,the load condition of pulling resistance pile design,pile capacity design of floatage resistance pile,pile body texture design of floatage resistance pile,monolithic stability of grouped piles foundation,floatage resistance per unit area,c...

依据工程实例对抗拔桩设计荷载条件、抗浮桩单桩承载力设计、抗浮桩桩身结构设计、群桩地基整体稳定性、单位面积抗浮力、抗拔桩抗裂分别进行了阐述，以及抗拔桩设计中应考虑的问题进行了论述。

This method is variational method, which will be much faster and more efficiency than other method.Firstly we use gauss integral method to disperse the least potential energy of barrette pile group, with the help of vertical settlement finite series and Mindlins equation, we derived vertical load-settlement solution of barrette pile group.

另外，目前有关壁板桩群桩水平承载特性的研究也比较少，因此，为了加深对壁板桩群桩承载特性的理解，本文利用变分法对壁板桩群桩竖直或水平受荷情况下的承载特性进行了初步的研究，通过变分法直接得出荷载位移显式方程，较之以往方法更加快捷。

Integrate the load transfer principle and shearing displacement method to set up the load transfer equation between the pile of soil, using the discrete and fitting methods to solve the equation so as to educe the pile displacement of arbitrary section as well as the analytical solution. Comparing the results with the soil settlement solved by the Mair equation, the relative displacement can be gained.

1结合荷载传递原理和剪切位移法的思想建立隧道开挖作用下的桩土荷载传递方程，采用离散和拟合两种方法来对该一元二次非齐次微分方程进行求解，可分别得到桩身任意截面处的桩体位移以及桩身位移的解析解，并与基于Mair公式求得的地面下任意深度处的土体沉降进行比较，即可求出桩与桩侧土之间的相对位移。

For Goupitan Hydropwer Station on Wujiang River,over 1 200 anti-uplift anchor pile s are arranged in the water cushion pool to anchor the non-uniform soft rock strata composed of shale,clay rock,silty clay rock,thin layer of marlite and less medium-fine calcareous sandstones etc.

乌江构皮滩水电站水垫塘部位布置了1200多根抗浮锚桩，对页岩、粘土岩、粉砂质粘土岩，及夹薄层泥灰岩和少量中细粒钙质砂岩等不均质软岩层软岩进行锚固，原设计锚桩的间距为2.2m，为了优化设计，缩短工期，在施工前进行了4根锚桩原位抗拔试验，根据锚桩在抗拔过程中周边一定范围内岩体变形沿径向的分布规律，及破坏时裂隙的扩展形态和范围，确定了锚桩的间距，在此基础上提出了锚桩间距的优化方案，并应用于工程施工。

In this paper, the author sets up the dynamic model of the vibratory extracting-driving piling machine, and carries out the dynamic analysis, parameter calculation and Matlab's simulation for this model. Using the equation reciprocity law to carry out the calculation of soil parameter and simulation, and using the genetic algorithm to make optimization of the machine on the basis of the simulation, the author gets the optimum self-induced vibration frequencies of the machine changing with the depth of the pile and the optimization result of other parameters, thus reaching the conclusion that along with the increase of pile sinking depth, the optimum self-induced vibration frequency becomes bigger, and the vibration mass becomes smaller, hence deepening the knowledge of the dynamic performance of this system.

本文建立了振动沉拔桩机的动力学模型并对这一模型进行了动力学分析、参数计算和Matlab仿真，并利用方程对等法进行土壤参数的计算和仿真，又在仿真的基础上使用遗传算法对桩机进行了优化，从而得出了路基加固振动沉拔桩机随沉桩深度变化而改变的最佳激振频率以及其它参数的优化结果，并得出了随沉桩深度的增加，桩机的最佳激振频率由小变大，最佳参振质量由大变小的结论，深化了对该系统动力学性能规律的认识。

Directed against the problem on confirming vertical bearing capacity of large diameter cast-in-place pile in the west of coteau area of Yunnan province, the paper, analyses the influence degree of the variety of soil physics and mechanics property in area geology condition on bearing capacity of pile foundation, through 5 piles' loading test; the influence degree of construction technics on bearing capacity of pile foundation under the influence of every exterior factors; the influence degree of grouting injection around the pile shaft on bearing capacity of pile foundation.

本文针对滇西山区大直径灌注桩竖向承载力确定存在的问题，进行了5根试桩的静载荷试验，分析了区域地质条件下土的物理、力学性质的变化对桥梁桩基承载力的影响程度；地下水对桩承载力的影响程度；各种外部因素影响下，桩的施工工艺对桩承载力的影响程度；通过在桩体周围土中注浆对桩承载力的影响程度。

It makes a design of pile clamping device with two-position pile clamping cylinder and self-alignment cylindrical surface.

本文简述了抱压式液压静力沉桩机的压桩工作原理，分析了作业时预制桩的破坏机理，设计了一种双层夹桩液压缸、柱面自动调心式的夹桩机构，并在ZYB系列桩机上应用，经实践检验获得了很好的效果，基本上避免了夹坏桩现象的发生。

In this paper , under the circumstance of small cross section of short piles driving into the shallow hard stratum, the authors use SCPT index to calculate driving resistance and considers the strength of the pile shaft to analyze.

采用 小截面混凝土短桩，是一种常见的桩基设计方法，可以充分发挥桩基中每立方混凝土的承载力，其经济意义是显而易见的。但在实际桩基施工过程中，沉桩往往产生截桩及桩头受损破坏等现象。

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。