| 1. | Measures to ensure quality of grouting pile head
灌注桩桩头质量保证措施 |
| 2. | Evaluation of vertical bearing capacity of super - long bored single pile by the pile head settlement
按桩顶沉降量控制超长灌注桩竖向承载力研究 |
| 3. | It indicates that viscous damping of soil layer shows a clear different effect on dynamic response at pile head comparing to hysteretic damping
研究表明，对于桩顶响应，桩侧土的粘性材料阻尼呈现出与滞回阻尼明显不同的影响特点。 |
| 4. | A method for shpae estimation of piles by using measured reponse data at the pile head is propsed , which can be used to determine the size , type and site of a defect in a pile
摘要本文提出了一种用实测桩顶脉冲响应信号估计基桩桩身形状的方法，该方法能定量确定桩身缺陷的位置、延伸?围以及严重程度。 |
| 5. | The results show that not only variations of pile impedance but also parameters of soil layer can make effects on the dynamic compliances at pile head . the coupled soil - pile dynamic interaction model and the corresponding
研究表明，不仅桩身变阻抗特性会对桩的动力响应产生影响，土层参数的变化也会产生相应的影响。 |
| 6. | Through the study of this problem , that an amendment method is presented for non - linear curve of equivalence pile head . the method can be used to analyze the three dimensional effect on nsas and commercial software ansys
本文针对这一问题进行了分析，并提出桩头等效非线性曲线的修正方法，并在nsas和大型商业软件ansys上均可以实现桩-土-结构共同作用的空间效应分析。 |
| 7. | Accordingly , solution for the dynamic response of grouped piles taking consideration of shear deformation was developed by using superposition principle , and the effects of shear deformation and the other factors on the horizontal displacement and the distribution of shear forces at pile head were investigated
在此基础上，利用叠加原理得到了考虑桩体剪切变形的群桩水平动力响应解，并分析了剪切变形和其他因素对桩顶水平位移以及桩顶剪力分布的影响。 |
| 8. | 3 . by comparing the available theories corresponding to plane strain model and winkler model with the solutions developed in this paper , the applicability of the two models is analyzed and checked . the comparison involves many aspects such as local soil stiffness , dynamic stiffness and time domain response at the pile head , and some important conclusions are made
3 、将基于平面应变简化假定和winkler模型的桩振动理论解与本文严格理论解对比，分析校验了平面应变简化假定和winkler模型在桩基振动理论应用中的适用性，具体比较范围涉及土层对桩的局部复阻抗、桩顶幅频响应、速度导纳、桩顶复刚度、桩顶时域响应等方面，并得到若干重要结论。 |
| 9. | With the consideration of the vertical wave effect of soil and soil - pile interaction , an approximate analytical solution to vertical vibration of pile system with variable impedance in visco - elastic layered soil is developed . a simplified and practical mathematical model for interaction between soil layers is proposed , and its applicability is theoretically investigated . based on this model and by using laplace transforms and the transmit property of impedance function , the analytical expression of the impedance function and solutions of the displacement and velocity response function in frequency domain and in time domain at the pile head are derived
4 、从三维轴对称土模型出发，对考虑桩土耦合作用、土层层间联系以及桩周土竖向应力梯度变化条件下的成层粘弹性土中完整桩及变阻抗桩系统纵向振动问题进行了研究，提出了成层土中变阻抗桩系统纵向振动问题的近似解析解法和桩周土层层间相互作用的简化而实用的数学模型，并利用拉氏变换和阻抗函数的传递性，获得了成层土中任意段变阻抗桩桩顶阻抗函数的解析表达式，以及桩顶速度导纳和时域速度响应解析解和半解析解。 |
| 10. | A comparison is made with available simplified theories such as that corresponding to plane strain model . the comparison involves many aspects such as the soil resistance factor , the soil complex local stiffness and the pile complex stiffness at the level of the pile head . the applicability of the other two models is analyzed and checked
3 、将本文严格解与其它简化解(如基于平面应变假定的解等)从土层阻抗因子、土层局部复刚度和桩顶复刚度等方面进行了对比分析，检验和校核了简化解的适用性。 |
