On the other hand , among recently deposited soils of nanjing and its surrounding areas , there are two types of soils with special structure , that is , silty clay and fine sand interbedded strata of nanjing with appearance presenting . thousand layers cake . and nanjing fine sand with schistous grain 在南京及其邻近地区的漫滩相新近沉积土中存在着两种具有特殊结构性的土层：呈现粉质粘土和粉砂组合的“千层饼”状外貌的粉质粘土与粉砂互层土和具有片状结构的粉细砂。
Finally , dynamic compliances of a pile with variable impedance embedded in layered saturated soil are studied . a simplified layered model is put forward on the basis of the single layer elastic bearing model . by using the same method , analytical solutions in frequency domain hence semi - analytical solutions in time domain representing the dynamic responses at pile head are obtained 基于土层层问相互作用，提出了饱和成层土中任意变阻抗桩的纵向振动问题简化层间模型，利用单层土中提出的解析方法，基于这一简化层间模型，求得饱和成层土中任意段变阻抗桩的桩顶频域解析解和时域响应半解析解，并论证了模型的合理性。
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。
The influence of soil on the pile was simulated by voigt model according to the layered characteristic of soil surrounding the pile . the semi - analytical solution for the relationship between the pile head settlement and time was obtained by laplace transform method and fourier inverse method . by using the solution , the influence of all relevant parameters on the pile settlement behavior was investigated and discussed 成层广义voigt体地基中单桩沉降的时间效应研究将成层地基中每一层土对桩的作用简化为广义voigt体模型，由此建立了单桩的静力平衡方程，并求解得到了成层地基中静荷载下单桩桩顶沉降在拉普拉斯变换域的解析解和在时间域的半解析解。
A novel method based on artificial neural network bp algorithm to perform the parametric identification in deep foundation excavation is proposed hi the paper . taking in situs measurements as network input and parameters to be identified as network output , the network is trained with the samples obtained from fem computation 将某些现场实测值作为网络的输入，土层物性参数作为网络的输出，通过有限元正分析模型取得学习样本来训练网络，从而达到对深基坑开挖过程中的多层土体的物性参数进行辨识的目的。
So a new method is presented ( equivalent damping of pile lateral damping ) to realize the analysis of integrity pile in soil . in this method , the coefficient of the damping is calculated by the length ratio of each pile in a soil layer to the whole pile in the heterogeneous soil . and through much calculation by use of matlab program , the equivalent damping in the heterogeneous soil is proved to be correct 提出了采用加权的方法对成层土中桩侧土阻尼系数进行等效简化的概念，即把各层土阻尼系数乘以该层土中桩段长度占桩身总长的比值(即为加权系数) ，然后相加即得到一个等效阻尼系数。
In this dissertation , on the basis of the existing work , the longitudinal vibration theory and the relevant properties of pile with defects and variation modulus in layered soils is studied , in which viscosity of pile material is considered and surrounding soils are simulated respectively with normal voigt model , normal maxwell model , general voigt model and general maxwell model 在总结前人研究成果的基础上，本文将桩侧土分别简化为标准voigt模型、标准maxwell模型、广义voigt模型、广义maxwell模型，并考虑桩自身材料阻尼，对成层土中变阻抗桩的纵向振动理论及其特性进行了研究。
Base on the finite element method , the major factors that affect the work behavior of self - expanded pile are studied , these major factors include the modulus of compressibility of pile side soil , bearing stratum soil and substratum soil ; the ratio of length and radius of pile ; the ratio of expanded body ' s radius and pile ' s radius ; the depth into bearing stratum of pile end ; load value and so on 然后通过有限元法分析了影响自扩桩工作性状的主要因素，研究了桩周土、持力层和下卧层土的性质、长径比、扩径比、桩端进入持力层深度、荷载大小等因素对自扩桩荷载传递特性的影响。
In this thesis , based on the principles of hydraulic mechanics and soil mechanics , the change of effective stress in soil mass and the settlement of ground surface induced by dewatering during excavation both in homogeneous soil and in layered soil were studied . analytical formulas for calculating the settlement and the others were derived under the assumption that the seepage induced by dewatering is one - dimensional and vertical 本文运用水力学和土力学的基本理论，在一维竖向渗流的假定下对均质土和成层土中基坑开挖降水引起的坑内外土中应力变化及周围地表沉降的计算方法进行了较深入的研究，推导了相应的地表沉降等计算公式。
The influences of soil structure , confining pressure and strain amplitude on dynamic properties of recently deposited soils of nanjing and its surrounding areas are discussed . furthermore , based on test results and theoretical analysis , the averaging curves , recommended values and envelopes of dynamic shear modulus ratio ggmax and damping ratio versus dynamic strain for recently deposited soils of nanjing and its surrounding areas are presented . by use of vibration triaxial apparatus , nanjing silty clay and fine sand interbedded strata and nanjing fine sand were tested and their test results are discussed 通过自振柱试验，探讨了土的结构性、有效围压和应变幅值大小对动荷载作用下南京及其邻近地区新近沉积土的动剪切模量、阻尼比和应力?应变关系的影响；通过试验和理论分析，给出了南京及其邻近地区的粘土、淤泥质粉质粘土、粉质粘土、粉质粘土与粉砂互层土、粉土以及砂土等六类新近沉积土中典型土类的动剪切模量比和阻尼比随剪应变幅值变化的平均曲线、包络线和推荐值。
