| 1. | The motion behavior at the interface of pile soil under seismic loading was analyzed , and its influence on the displacement response of pile footing and superstructure was also discussed
利用这一模型，分析了地震作用下桩土交界面处的动力反应形态，探讨了桩土间的接触非线性及其对桥梁结构地震反应的影响。 |
| 2. | The characteristic of strip friction in soil was acquired successfully . by direct shear test , the effect of strip direction and anchoring situation of strip end on shearing strength of the reinforced earth was carried out
试验获得了筋土间的摩擦特性，通过直剪试验研究了加筋方向、筋带端部锚固对于加筋土抗剪强度的影响。 |
| 3. | Spring was used in hyperbolic constitutive equation to model the pile - soil - pile interaction under the vertical load assuming consistency of horizontal displacement on the interface between pile and soil
利用桩土界面间水平方向位移相容，桩土界面间竖向设置双曲线本构方程的弹簧，能较好模拟竖向荷载作用下特大型群桩基础桩土间相互作用。 |
| 4. | Longitudinal vibration theory of pile is the basis of any kind of method in dynamic pile testing , which can be used to explain the dynamic reaction between pile and soil , the mechanics of pile testing , and to illustrate the pile testing curves
桩的纵向振动理论是各种动态试桩方法的理论基础，开展桩的纵向振动理论研究对于进一步弄清桩?土间动力相互作用、动力试桩的机理以及正确分析桩的测试曲线非常重要。 |
| 5. | The 3d model of soil pile superstructure interaction system was established by using finite element method , and the interface element was used to model the interface behavior between soil and pile materials
本文针对地震作用下桥梁桩基础的接触面效应及其对结构地震反应的影响问题，以某桥梁工程为背景，通过在桩土交界面处设置接触单元来模拟桩土间的接触非线性，建立了土桩桥梁结构相互作用体系的三维分析模型。 |
| 6. | ( 3 ) the method to compose the earth , reinforcement , facing units to reinforced earth fea modal is analysed , then the advantages and disadvantages of different modals that simulate the reciprocity between the earth and reinforcement used in the reinforced earth fea modal are discussed
( 3 )分析总结了将加筋、土体、面板等的有限元模型合成为加筋土有限元模型的方法,分析总结了整体式、分离式、组合式及筋土单元模型等加筋土的筋土间相互作用的优点与缺点。 |
| 7. | Secondly , the static stress and strain characteristic of polymer - geogrid reinforced earth is summarized , the pulling stress distributing of the reinforced material in the earth walls , the interface characteristeric between the reinforced material and earth and the friction stress distributing between the reinforced material and earth are analysed
然后，总结了塑料土工格栅加筋土静应力应变特性的一般理论，分析了塑料土工格栅筋材在挡墙中的拉应力分布和塑料土工格栅与土的界面特性以及筋土间摩擦应力的分布。 |
| 8. | By assuming that distortion is coordinative and stress is in equilibrium at the interfaces of columns and soil in composite foundation and that the average consolidation degree in composite model was equal to the one in composite foundation , a three - dimensional composite model was established by effective stress analysis method . the corresponding finite element method is then developed for consolidation analysis of composite foundation
在假定复合地基桩土间竖向和切向变形协调、应力平衡以及复合元模型的平均固结度与单桩轴对称复合地基的平均固结度相等的条件下，用有效应力分析法建立了三维复合有限元模型，提出了基于此模型的复合地基固结变形分析有限元法。 |
| 9. | Based on the assumed vertical displacement of the unit cell and the assumed distribution on the pile - soil interface of the pure friction pile , and using the boundary conditions that there was no relative slipping between pile and soil , the pile decrement was equal to that of soil on the pile - soil interface and that the vertical sheer stress of the unit cell ' s outer edge was equal to zero , the formula for the frictional distribution of the pure friction pile and the formulas for the displacement of pile and soil in the treated area were deduced
通过假定的单元体竖向位移模式和纯摩擦桩桩侧摩阻力分布模式，利用桩土间无相对滑移、桩土界面处桩土压缩量相等和单元体边界处竖向切应力为零等边界条件，推导出复合地基纯摩擦桩桩侧摩阻力分布的具体表达式，以及加固区桩土压缩量的计算公式。 |
| 10. | So how to transfer scientifically self - balanced test data into top load curve according to its actual working behavior , become the obstacle of its practical application . in accordance with actual forcing behavior and reaction mechanism between pile and soil , the article analyzes the relation between top part and bottom part , load transferring mechanism and difference with other loading way by ansys program . so the reliability of determine bearing capacity by self - balance method has been proved
本文根据自平衡加载方式下桩身的实际受力状况、桩土间的相互作用机理以及单桩破坏机理，建立了单桩的离散元模型，采用ansys通用分析软件，选取合理的单元类型、材料特性等，数值分析了基桩在自平衡加载方式下上下桩段的相互关联、荷载传递机理以及与其它加载方式的区别，论证了采用自平衡试桩法测定单桩极限承载力的可行性。 |
