At last , the load transmission property of cast - in - place piles , the developing cause of friction resistance and base resistance , and some factors which influence pile ' s bearing capacity and settlement are analyzed . then , we introduced two parameters , e and c to represent the disturbing effect in pile construction on parameters of modulus es and cohesive c , which determined by the pressed piles 在这个基础上进一步分析了打入桩的沉桩挤土效应对桩荷载传递的影响及其与静压桩的差异，在静压桩修正系数k _ c和k _ e保持不变的情况下，再引进打入扰动系数_ e和_ c ，以其和原来静压桩的k _ c和k _ e的乘积作为打入桩时的修正系数。
The experiential formula between kc and base resistance q from cpt and , the relationship between ke and c # ( strength of concrete ) are also created by fitting 94 pressed pile testing date . based on analyzing the compacting effects caused by driving pile in loess and it ' s influence on bearing capacity and settlement , another two disturbance parameters , c and e , are proposed for multiplying respectively the parameters of soil cohesive c and deformation modulus es to reflect this effect . by fitting 51 driven pile testing date , we created an experiential formula between the e and r ( the modulus ratio between pile and surrounding soil ) , also an experiential formula between the c and base friction resistance fs / pa from cpt of pile surrounding soil 在本文中分析了静压桩的沉桩挤土效应对其承载力与沉降特性的影响，在计算模型中引入了桩周土粘聚力c的修正系数k _ c和桩周土变形模量e _ s的修正系数k _ e来体现这种影响，通过对94根静压桩试桩资料进行拟合，建立了k _ c与桩端土静力触探的端阻q _ c之间经验公式以及k _ e与c # (混凝土标号)之间的对应关系。
Then displacement fields are researched via the finite element model that accords with actual process of jacked pile . and the effects of displacement fields caused by difference modulus ratio , friction between pile and soil , possion ration of soil and soil index of c and are put forward 接着建立了能够模拟沉桩连续贯入的有限元模型，利用该有限元模型分析了桩土模量比、桩土界面接触刚度、桩土界面摩擦、泊松比以及土体的c和指标等因素对沉桩挤土效应的影响。
Mechanical impact dynamics is used to analyse the production and spread of stress wave when hydraulic pile hammer hammerblows piles , the stress wave influence the course of driving pile . slender hammer that is equal to wave resistance of the pile can bring ideal stress waveform . when the hammer weight is constant , efficiency of driving pile can be increased by means of selecting drive cap and cushion pad of different rigidity to match the hammer according to various geological condition and the pile . the structure and principium of hydraulic system of double - acting hydraulic pile hammer with double cylinders is studied in detail in the paper , the hydraulic system and electric control system of six - ton - double - actin hydraulic pile hammer with double cylinder is designed on the basis of it 本文应用冲击机械系统动力学分析打桩过程中锤体与桩撞击时应力波的产生、传播以及该波对沉桩过程的影响。认为与桩等波阻的细长状锤体能够产生理想的应力波波形；在桩锤重量一定的情况下，可针对不同的地质情况和桩，通过选择不同刚度的桩帽和桩垫与其匹配来提高打桩效率。本文对双缸双作用液压打桩锤液压系统的结构和工作原理进行了深入的研究，并在此基础上设计出六吨双缸双作用液压打桩锤的液压系统和电控系统。
To counter the main reasons of piles ' displacement and inclination , i . e . , 1 ) greater lodging after removal of pile cap ; 2 ) inclination of pile frame ; 3 ) driving into ballast course ; 4 ) obvious rolling of excavated mud surface , a set of effective measures dealing with deviation of marine driving are offered 针对其中影响桩跑位和桩倾斜的主要原因，即： 1 )起帽后桩倒伏大； 2 )桩架不垂直； 3 )碎石层上沉桩； 4 )挖泥泥面起伏大，总结出一套控制水上沉桩偏位行之有效的方法。
