| 均质土中PCC桩与实心桩动力响应对比分析 |
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| 引用本文： | 丁选明,刘汉龙.均质土中PCC桩与实心桩动力响应对比分析[J].岩土力学,2011,32(Z1):260-264. |
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| 作者姓名： | 丁选明 刘汉龙 |
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| 作者单位： | 河海大学水资源高效利用与工程安全国家工程研究中心;河海大学岩土工程科学研究所;河海大学岩土力学与堤坝工程教育部重点实验室 |
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| 基金项目： | 国家自然科学基金资助(No.51008115);江苏省博士后基金资助(No.1001041C);江苏省自然科学基金创新学者攀登项目(No.BK2008040) |
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| 摘 要： | 现浇混凝土大直径管桩(简称PCC桩)由于具有较大的内、外壁摩阻力,在竖向荷载作用下表现出与一般实心桩不同的静、动力特性。采用建立的解析公式,对PCC桩、等截面积实心桩和等外直径实心桩3种桩的动力响应进行了对比分析,研究结果表明,当桩端阻力相对较小时,3种模型位移幅值差别不大;当桩端阻力较大时,3种模型幅频曲线和相频曲线存在较大差别;等面积实心桩位移幅值比PCC桩稍大,而等外直径实心桩的位移幅值比PCC桩稍小;位移相频曲线呈现等间距的震荡,实心桩的震荡峰值比PCC桩要高,且震荡峰值对应的频率各不相同,PCC桩出现震荡峰值的频率比实心桩小;3种计算模型动刚度震荡幅值差别较大,等直径实心桩的动刚度最大,等面积实心桩次之,PCC桩最小;等直径实心桩的虚部最大,PCC桩次之,等面积实心桩最小,振动过程中等直径实心桩桩顶阻尼最大;等面积实心桩的速度导纳最大,PCC桩次之,等直径实心桩最小。PCC桩充分发挥了单方混凝土的性能,比等截面实心桩具有更小的动力响应,比等外径实心桩更节省混凝土。
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| 关 键 词： | 大直径管桩 动力响应 位移幅值 动刚度 速度导纳 |
| 收稿时间： | 2010-12-15 |
Comparative analysis of dynamic responses of cast-in-place concrete large-diameter pipe pile and solid pile in homogeneous soil |
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| DING Xuan-ming,LIU Han-long.Comparative analysis of dynamic responses of cast-in-place concrete large-diameter pipe pile and solid pile in homogeneous soil[J].Rock and Soil Mechanics,2011,32(Z1):260-264. |
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| Authors: | DING Xuan-ming LIU Han-long |
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| Institution: | 1. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing 210098, China; 2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 3. Geotechnical Research Institute, Hohai University, Nanjing 210098, China |
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| Abstract: | The static and dynamic characteristics of cast-in-place concrete large-diameter pipe pile (PCC pile for short) are not the same as a common solid pile because of the difference of inside and outside frictions. Based on an analytical solution deduced by the authors, the dynamic responses of PCC pile, solid pile with the same cross-section area and solid pile with the same outer diameter are analyzed. The results indicate that the displacement amplitudes among different pile models have little difference when the tip resistance is relatively small, however, they have greater difference when the tip resistance is relatively large. The displacement amplitude of solid pile is larger than that of PCC pile with the same section area, while the displacement amplitude of solid pile with the same outer diameter is smaller. The phase-frequency curve of the displacement presents periodical oscillation; the peak value of solid pile is larger than that of PCC pile; and the frequency corresponding to the peak of solid pile is higher than that of PCC pile. The oscillation aptitudes of dynamic stiffness among three pile models are different. The real part of the dynamic stiffness of solid pile with the same outer diameter is the largest; that with the same section area takes the second place; and that of PCC pile is the smallest. The imaginary part of the dynamic stiffness of solid pile with the same outer diameter is the largest; that of PCC pile takes the second place; and that with the same section area is the smallest. The velocity admittance has similar characteristics. The velocity admittance with the same outer diameter is the largest; and that with the same section area is the smallest. The capacity of unit volume concrete is fully exerted for PCC pile; thus the dynamic response of PCC pile is smaller than solid pile with the same cross-section, and the concrete is more economic than the solid pile with the same outer diameter. |
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| Keywords: | large-diameter pipe pile dynamic response displacement amplitude dynamic stiffness velocity admittance |
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