Based on the discussion above , firstly in this article , it researches the deformation situation of pile soft soil flexible foundation of djcm pile composite ground under flexible foundations and the effecting law to the mechanic characteristics of soil while making pile through the model test in library 基于上述考虑，本文首先通过室内模型试验，研究了柔性基础下水泥粉喷桩地基中桩、桩间土和柔性基础(试验中为砂垫层)的变形情况，以及水泥粉喷桩在成桩过程中对桩间软土物理力学性质的影响规律。
The whole dynamic finite - element analysis simplified based on 2d plane is performed to adapt engineering requires . the effect of both kinematic interaction and inertial interaction on pile - soil - structure systems within layered soil field is relatively comprehensively investigated . at the same time , the boundary effect of model , the horizontal dynamic features of piles and the nonlinear characteristic of slide and contact on the interfaces of pile - soil are considered too on the ground of no - element meshing technique applied for dimensional effect of piles in stratum - soils 建立了以适应工程需要的基于二维平面动力分析的简化整体有限元模型；提出了能有效考虑桩尺寸效应的桩-土无单元划分技术，在考虑了模型的边界效应、桩基的水平动力特性和桩土界面的滑移、接触非线性行为的基础上，从时域内较为全面的研究了层状土域中桩基上下部结构的惯性相互作用和运动相互作用两种基本效应。
The process of penetration is regarded as expansion of cylindrical cavity in infinite soil mass . combining with the knowledge of elastic mechanics and plastic mechanics , we may make analysis for soil around pile . and we may deduce the cylindrical cavity pressure , radius of plastic zone , radical displacement in elastic zone , and excess pore water pressure in soil around pile and spherical cavity pressure at the end of pile 本文阐述了桩土共同作用理论原理，对坑式静压桩的桩周土体作弹塑性分析，把压桩过程中桩周土体的本构关系看作是水平面的平面应变小孔扩张问题，利用小孔扩张原理，结合弹性力学以及塑性力学的知识，对压桩后土体的性状进行分析，得出桩对土的挤扩作用力、桩周土体塑性半径、弹性区的位移，以及桩端球形孔扩张的扩张力。
Abstract : the excess pore water pressure of saturated soft clay foundation caused by pile pushing is obvious . the method for calculating squeezing stress and excess pore pressure by elastic - plastic theory is deduced in this paper , and furthermore , the reasonable pile spacing by regarding the influence of both squeezing stress and excess water pressure is given 文摘:饱和软粘土地基沉桩过程中桩土挤压所引起的桩周土体超孔隙水压力效应是非常显的.本文从弹塑性理论出发推导出沉桩过程中桩周土体挤压应力及超孔隙水压力的计算公式，给出了考虑挤压应力和超孔隙水压力影响因素的合理打桩间距的确定方法
On this foundation the article inducts in detail the method which is based on the relative settlement of calculating unit area end support ( qb ) force at the same time considering the feature of pedestal pile ' s " arch effect " the article introduces conception of pile effective length and finally obtain t he formula of calculating man - made pipe with bulb - shaped axial carrying capacity . the article uses marc program to calculate and analyze foundation soil ' s stress and displacement and gets the change curve chart and the proportion that is shared by king - pipe side soil friction resistance and pipe end counterforce respectively . the article inducts the structure of pedestal in detail on the basis of generalizing pedestal application cases of many countries 在此基础上论文详细归纳了以相对沉降为依据确定单位面积端承力q _ b的计算方法，并考虑扩底桩的“拱效应”特点引入了有效桩长的概念，最后结合公路规范推出了比较实用的人工挖孔扩底桩轴向承载力计算公式。论文运用了marc程序对地基土的应力和位移进行了有限元数值计算分析，得到了地基土的应力和位移场的变化曲线和在加载过程中桩侧土摩阻力和桩端反力各自所承担的比例；本文还在总结各国挖孔扩底桩应用情况的基础上就扩底桩的构造进行了详细的归纳。
The numerical results show that the lateral ground displacement is one of factors that cause pile failures in liquefied ground . at the soft - hard interface , pile may overbear the ultimate moment which leads to bending and shearing failures . therefore , except the effect of large inertial loads from superstructure , the influence of the lateral ground displacement on pile foundation cannot be neglected in a seismic design of pile foundation in lateral spreading ground 计算结果表明地基的侧向位移是与液化有关的桩基震害的主要原因之一，在软硬交界处桩可能承受了超出桩本身极限抗弯能力的弯矩，容易发生弯剪破坏，在有液化侧扩地基中桩基的设计不能仅考虑上部结构震动的影响，地基的水平侧向位移对桩基的影响不容忽视。
On the basis of analyzing data from several field tests , assumption was proposed for the distribution of side friction along column under rigid raft , and settlements of column and soil in the composite foundation with single column were analyzed by totally stress method . the corresponding computer program was developed at the same time . 2 在对若干试验结果分析的基础上，提出了刚性基础下复合地基桩侧摩阻力分布形状的假定，然后基于总应力法分析了单桩复合地基中桩体和桩间土的沉降变形，并编制了相应的计算程序。
The paper can concern the soil ' s instantaneous fallout , soil ' s main settlement due to concretion , and the coactions of soil and pile by applying the contact surface to simulate the coactions . the paper can analyze the service behavior of reuniting foundation and the effect of the pile ' s intensity , length and distance . the paper is concerned with the stressing of pile and the arrangement of pile for the smaller cost to fit the subsidence of throughway 通过有限元计算，分析了复合地基桩土工作性状，分析了桩的刚度，长度，桩距对地基沉降及超孔隙水压力的影响，并根据复合地基中桩的受力特点，提出合理的桩的布置方式，在满足高速公路路面沉降要求的前提下，节省工程投资，加快建设进度。
As follows are the main contents of this paper : firstly , a matlab program has been worked out according to the response model of integrate and defective pile in time zone ; secondly , the most important factor that affects the curve of velocity is obtained through analyzing the curve of velocity response 主要研究内容如下：首先，针对成层土中完整桩和缺陷桩的时域响应模型编制了matlab程序；其次，通过对成层土中桩的时域速度响应曲线的分析，得到了影响速度响应曲线的主要因素。
That is to say , there are differences in selecting the points which represent the average compactive effect of soil between piles . based on cavity expansion method , the stress change of soil between piles when sinking pile is studied with elasto - plasticity theory . the triaxial compression tests of undisturbed samples are carried our in laboratory 本文通过圆孔扩张理论，应用弹塑性理论对灰土挤密桩成孔过程中桩间土土体应力的变化进行了分析研究，通过试验采取原状土样进行三轴试验，用邓肯-张模型建立土的本构关系，对桩间土的挤密进行理论分析，并通过现场干密度试验，分析和研究桩间土的挤密效果。
