( 2 ) study on the effects of the design parameters of the piles , which affect the counterforce on the pile head and the sedimentation characteristics of the piled raft foundation . ( 3 ) the principles , methods and processes of balance design method for variable - rigidity were expatiated on the basis of above studies 理论研究表明:桩距、桩长、桩径及筏板厚度的变化对桩筏基础桩顶反力及沉降特性有很大影响,特别是筏板厚度和桩距的变化对桩筏基础沉降差影响甚大。
Therefore , it is no time to delay that refining the design method of tall buildings . in this paper , tall frame and layered soil are treated as a single continuous system and an interactive analysis method is presented using finite element method and finite layer method . the settlement of foundation and the internal force of the frame are calculated with different stiffness of the superstructure 本文基于共同作用分析法研究高层框架和桩基础的设计，即将高层框架与桩基础视为一个统一的整体，采用有限元和有限层法进行共同作用分析，研究了上部结构刚度变化等因素对基础沉降与框架内力的影响，并与常规设计法进行了比较分析，为改进和提高框架结构设计的安全和经济提供了依据。
Pile and raft take the load of buildings together . it possesses good whole , high vertical capacity , small settlement of foundation and well performance of balancing differential settlements . it could bear large wind or seismic induced horizon load , and could have large capacity of resisting inclination 桩筏基础同时具有桩基础和筏板基础的优点，桩一筏共同承担建筑物的荷载，它具有整体性好、竖向承载力高、基础沉降小、调节不均匀沉降能力强的优点，同时可以承受风荷载或地震荷载引起的巨大水平力，抗倾覆能力强。
Abstract : a mechanical model to analyze the dynamic performance of train and transition section between roadbed and railway bridge was established a nd a series of reasonable criterions were put forward too . based on this , the init ial deformation of rails due to different subsidence of roadbed and bridge abutm ent , the effects of the direction and speed of train on the dynamic performance o f wheel / track system were studied . at last , the method to determinate the length o f transition section was suggested 文摘:建立了列车与路桥过渡段动力特性分析模型，确定了一套轨道过渡段动力特性的评价指标，分析了由基础沉降差引起的钢轨初始变形以及行车方向、行车速度对轮轨系统动力性能的影响，提出了确定路桥过渡段长度的方法。
And in coordination with data obtained from an engineering test on site , the regularities of foundation settlement and the distribution properties of pile reaction , soil reaction and steel stress in raft , of the pile - ( thick ) raft tested are analyzed . in the same time , the calculating results with finite element method almost correspond with measured results 另外，通过对一超高层建筑桩(厚)筏基础进行原位实测，取得了比较完备的实测资料，分析了基础沉降的特点和桩顶反力、桩间土反力和筏板钢筋应力的分布特点和规律，同时用有限元法进行了近似计算，与实测结果基本吻合。
By research done on a structural model with numerical calculation method , the effects of some factors , such as superstructure stiffness , thickness of raft , compressive modular constant of soil , suspended width of raft and raft concrete intensity , on the working behavior of thick - raft foundation are analyzed 然后，通过建立结构模型，用数值计算的方法研究了上部结构、筏板厚度、地基压缩模量、筏板悬挑宽度和筏板砼等级五个因素对基础沉降、基底反力和筏板内力的影响，分析了厚筏基础的基本受力特性。
Through simulation , found the influence rule on existed structure by shield construction , discussed construction factors such as soil deformation modulus , different thickness of and different elastic modules of equivalent circle zone , control soil pressure , initial stress release rate influence on the surface settlement and structure deformation , studied the reasonable parameter value scope 通过数值模拟,研究了盾构施工对既有结构的影响规律。讨论了地基变形模量、等代层厚度和参数、围岩应力初期释放率、盾构正面土压力等施工因素对地表沉降和筏板基础沉降的影响,研究了穿越结构物时参数的合理取值范围。
Because interaction between pile - raft foundations and soil is very complex , what ' s more , there are many effect factors , piles and caps ( or rafts ) form a common working system whose bearing capacity and settlement are affected and restricted by interaction between them . the method of computing settlement that code provides is not a pure theoretic method and it is an experiential method in essence . in this paper , based on engineering designs of taiyuan , in - site experiments , observation data of structure settlement and so on , settlement is analyzed and computed by applying mindlin stress formula and using software matlab 现规范推荐的桩基沉降计算方法，并不是一种纯理论的方法，其实质是一种经验拟合的方法；本文结合太原地区的工程设计、现场试验、主体沉降观测资料等，运用明德林( mindlin )应力公式，然后按分层总和法原理，采用matlab软件计算程序进行沉降计算、分析，结果表明：高层建筑桩?筏基础沉降较小，且较均匀，得出了太原地区的桩?筏基础沉降计算的经验系数_ p ，从而使设计、计算结果更接近于工程实际，同时考虑筏板对上部结构荷载的分担是合理的、先进的，对高层建筑桩?筏基础加强了认识。
