均质土中PCC桩与实心桩动力响应对比分析

›› 2011, Vol. 32 ›› Issue (S1): 260-264.

均质土中PCC桩与实心桩动力响应对比分析

丁选明^{1, 3}，刘汉龙^{2, 3}

1. 河海大学水资源高效利用与工程安全国家工程研究中心，南京 210098； 2. 河海大学岩土力学与堤坝工程教育部重点实验室，南京210098；3. 河海大学岩土工程科学研究所，南京210098

收稿日期:2010-12-15 出版日期:2011-05-15 发布日期:2011-05-16
作者简介:丁选明，男，1980年生，博士，在站博士后，主要从事软基加固和桩基动力学方面的研究工作
基金资助:
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）

Comparative analysis of dynamic responses of cast-in-place concrete large-diameter pipe pile and solid pile in homogeneous soil

DING Xuan-ming^{1, 3}, LIU Han-long^{2, 3}

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

Received:2010-12-15 Online:2011-05-15 Published:2011-05-16

摘要/Abstract

关键词: 大直径管桩, 动力响应, 位移幅值, 动刚度, 速度导纳

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.

Key words: large-diameter pipe pile, dynamic response, displacement amplitude, dynamic stiffness, velocity admittance

中图分类号:

TU 473.1

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]. , 2011, 32(S1): 260-264.

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]. , 2011, 32(S1): 260-264.

参考文献

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