[1] Shi Minglei*, Deng Xuejun, Liu Songyu,. Study of LDBPs Shaft Skin Friction for Piles in Cohesiove Soils [J]. Journal of Southeast University (English Edition), 2002, 18 (2): 154-158. [doi:10.3969/j.issn.1003-7985.2002.02.011]
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Study of LDBPs Shaft Skin Friction for Piles in Cohesiove Soils(
)
粘性土中LDBPs桩侧极限摩阻力研究
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 18
- Issue:
- 2002 2
- Page:
- 154-158
- Research Field:
- Traffic and Transportation Engineering
- Publishing date:
- 2002-06-30
Info
- Title:
- Study of LDBPs Shaft Skin Friction for Piles in Cohesiove Soils
- 粘性土中LDBPs桩侧极限摩阻力研究
- Author(s):
- Shi Minglei*; Deng Xuejun; Liu Songyu
- College of Traffic and Transportation Engineering, Southeast University, Nanjing 210096, China
- Keywords:
- large diameter bored piles; pile shaft skin friction; blow count of standard penetration test
- PACS:
- U443.154
- DOI:
- 10.3969/j.issn.1003-7985.2002.02.011
- Abstract:
- The methodology of predicting pile shaft skin ultimate friction has been studied in a systematic way. In the light of that, the analysis of the pile shaft resistance for bored and cast-in-situ piles in cohesive soils was carried out thoroughly in the basis of field performance data of 10 fully instrumented large diameter bored piles(LDBPs)used as the bridge foundation. The undrained strength index μ in term of cohesive soils was brought forward in allusion to the cohesive soils in the consistence-plastic state, and can effectively combine the friction angle and the cohesion of cohesive soils in undrained condition. And that the classical “α method” was modified much in effect to predict the pile shaft skin friction of LDBPs in cohesive soils. Furthermore, the approach of standard penetration test(SPT)N value used to estimate the pile shaft skin ultimate friction was analyzed, and the calculating formulae were established for LDBPs in clay and silt-clay respectively.
- 根据10根试桩静载荷试验和桩身应力测试结果, 在对桩侧极限摩阻力预测技术系统分析的基础上, 研究了粘性土中LDBPs桩侧极限摩阻力的预测方法和指标确定.针对硬塑状态的粘性土, 提出了不排水强度指数μ的概念, 综合了粘性土不排水条件下内摩擦角和粘聚力.基于这一概念, 对传统的“α法”进行了扩展, 使之更加有效地应用于粘性土中LDBPs桩侧摩阻力的预测.同时还对SPT锤击数N预测粘性土中LDBPs的桩侧摩阻力进行了统计分析, 并对粘土和亚粘土分别提出了相应的回归公式.
References:
[1] Cock E. Design of axially load bored piles — European codes, practice[A].In:Van Impe & Heageman, eds. Deep Foundation on Bore and Auger Piles [C]. Balkema, Rotterdam, 1998 63-74.
[2] Poulos H G, Davis E H. Pile foundation analysis and design [M]. New York:John Wiley and Sons, 1980.18-51.
[3] Richard J Finno.Predicted and observed axial behavior of piles[M]. New York: Geotechnical Special Publication No.23 published by the American Society of Civil Engineers, 1989.97-106.
[4] Alessandro Mandolini. Design of axially loaded piles-Italian practice [A].In: De Cock & Legrand, eds. Design of Axially Loaded Piles—European Practice[C]. Balkema, Rotterdam, 1997.219-242.
[5] Findlay J D, Brooks J N, Mure J N, et al. Design of axially loaded piles-United Kingdom practice[A]. In: De Cock & Legrand, eds. Design of Axially Loaded Piles—European Practice[C]. Balkema, Rotterdam, 1997.353-376.
[6] Burland J B. Shaft friction of piles in clay—A simple fundamental approach [J]. Ground Eng, 1973, 6(3):30-21.
[7] Balakrishnan E G, Balasubramaniam A S, Noppadol Phien-wej. Load deformation analysis of bored piles in residual weathered formation[J]. Journal of Geotechnical and Geoenvironmental Engineering February, 1999.122-131.
[8] Kuwabara E, and Tanaka M. Statistical analysis on shaft friction of vertically loaded bored piles[A].In: Van Impe & Haegeman, eds. Deep Foundations on Bored Auger Piles[C].Balkema, 1998.221-228.
Memo
- Memo:
- * Born in 1962, male, associate professor.