| 1. | The effect of area replacement ratio and pile length on the stress and deformation of composite foundation
面积置换率和桩长对复合地基的应力和变形的影响 |
| 2. | Outside the improved area , the peak acceleration increases and the peak shear stress decreases with the increment of replacement ratio
在复合地基加固范围之外，随着置换率的增加，复合地基中加速度峰值逐渐增大而剪应力逐渐减小。 |
| 3. | Using the contrast tests of 13 recycled aggregate concrete beams and natural aggregate concrete beams , the effects of replacement ratio of recycled coarse aggregate and shear - span ratio on the characters of shear capacity and deformability of recycled concrete beams are investigated
摘要通过13根再生混凝土梁与普通混凝土梁的对比试验，对再生粗骨料取代率、剪跨比等因素对再生混凝土梁斜截面受力和变形性能的影响进行探讨。 |
| 4. | And then , using the ansys program and predigesting the pile - balsa foundation to plane strain problem , some main parameters ( foundation stiffness , pile soil module ratio , replacement ratio , etc ) were calculated to analyze the influence to stress field and deformation field in soil
其次利用ansys有限元程序，将复合桩基近似简化为平面应变问题。分析了基础刚度、桩土模量比、置换率等对地基中应力场和位移场分布的影响。 |
| 5. | The peak acceleration and the peak shear stress in superstructures increase with the increment of replacement ratio . parameters of softening model are obtained through seismic settlement tests of composite cemented clay samples and relative curves are plotted considering different replacement ratio
通过复合试样的震陷试验，采用软化模型的概念，得到了该模型有限元计算的有关参数，将这些参数和置换率的关系绘制成曲线并且给出了拟合公式。 |
| 6. | Firstly , the theory of compound foundation and pile foundation are summarized in this paper . the finite element , displacement models and computational program are introduced , then how such factors as the stiffness of pile , the ratio of length and radius of the pile & replacement ratio influence the settlement of compound foundation are analyzed . there has the best modulus of pile , the best of the length & replacement ratio and some data have been obtained
首先总结了复合地基和桩基的理论和设计计算方法，对有限单元和位移模式以及有限元计算程序进行了介绍，然后分析了桩的刚度、长径比、置换率等因素对复合地基沉降的影响，证实了带承台复合地基存在最佳桩土模量比、最佳长径比和最佳置换率，并得出了相应的数值可供工程实践参考。 |
| 7. | Compared with free field , the peak acceleration decreases and the peak shear stress increases under the overload transmitted from superstructures either inside or outside improved area . at the same replacement ratio , the peak acceleration and the peak shear stress both increase with the increment of layers in superstructures
在上部建筑结构中，复合地基置换率相同时，随着层数增加，结构中的加速度和剪应力峰值都随之增大;而置换率增大时，结构中的加速度和剪应力峰值也增大。 |
| 8. | ( 3 ) optimization design principle of long - short - pile composite foundation is put forward , base on which replacement ratio and pile length is taken as design variable , bearing capacity , settlement , stratum strength and other demands acted as constraint function , pile cost taken as objective function , so the optimization design model of long - short - pile composite foundation is built
( 3 )提出了长短桩复合地基优化设计原理,在此基础上将置换率和桩长作为设计变量,承载力、沉降、下卧层强度等要求作为约束函数,总制桩费用作为目标函数,建立出长短桩复合地基优化设计数学模型。 |
| 9. | The formula of dynamic fem is deduced based on dynamic biot ' s consolidation equation considering the coupling of seepage and dynamic analysis with time - history analysis method . parameters are determined from tests and a fem program is developed . dynamic responses of free field and superstructure considering different replacement ratio are analyzed
采用时程分析法，以渗流和动力分析相耦合的biot动力固结方程为基本方程，推导了动力分析有限元计算分析的格式，编制了相关计算程序，水泥搅拌桩复合地基的静力和动力参数由本文的试验确定。 |
| 10. | The static triaxial test is performed on composite cemented clay samples and parameters of duncan - chang model are obtained considering the effects of replacement ratio and confining pressure . the effects such as replacement ratio , strain amplitude and confining pressure on the dynamic modulus and damping ratio of composite cemented clay samples are analyzed through undrained dynamic triaxial test . fitting equations estimating the dynamic modulus and damping ratio through regression analysis are deducted with the effects of replacement ratio , strain amplitude and confining pressure
通过不排水动三轴试验详细地分析了置换率、应变幅和围压等因素对水泥土复合试样动模量和阻尼比的影响，根据有关数据，得到了较为完整的复合试样的动力变形曲线，通过回归分析方法，得到了考虑置换率，应变幅和围压影响的水泥搅拌桩复合试样动模量和阻尼比的拟合公式。 |
