Design Method of Long-Short-Pile Composite Foundation Base on Tangent Modulus In Situ Loading Test Curve

Abstract:

The settlement of each part of the composite foundation, such as the foundation mat, cushion, soils and pile head, is recognized as equivalent under normal working conditions. On the basis of this, the corresponding load on long-short pile and soils can be derived easily from each individual p-s curve. The p-s curve of the composite foundation can be pictured in terms of the mutual actions of all the components mentioned above. and thus the corresponding settlement with load will be determined. Meanwhile, the p-s curve can be obtained via the undisturbed soil hyperbola tangent modulus method, which not only characters the nonlinear relationship between load and settlement very well, but also shows the deformation compatibility among those components. It is found that designed bearing capacity of soil is much higher than the reality based on usual design norms of composite foundation, while pile load is greater than the designed ones, which can be credited to the deformation compatibility of pile-soil not considered.

• Periodical: Advanced Materials Research (Volumes 243-249)
• Pages: 2314-2323
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.243-249.2314
• Online since: May 2011
• Authors: Peng Liu, Guang Hua Yang, Yu Cheng Zhang
• Keywords: Deformation Compatibility, Long-Short-Pile Composite Foundation, Settlement Control, Tangent Modulus of Soil

References

[1] X.N Gong. The theory of composite foundation and engineering application. Beijing: China Architecture and Building Press, 2002(in Chinese).

[2] C. Dun, X.N Gong. Building Construction, 2003,Vol.25, No.1,18-20(in Chinese).

[3] W. Cui, S.W. YAN, H.J. Zhou. Rock and Soil Mechanics, 2005,Vol.26, No.2,290-294(in Chinese).

[4] G.H. Yang B.K. SU, Y.L. Qiao. Chinese Journal of Rock Mechanics and Engineering,2009,Vol.28, No.11, 2193-2200(in Chinese).

[5] K. Zhu, R.G. Xu, Y. Guo. Journal of Zhejiang University (Engineering Science),2008, Vol.42.No.1,72-76(in Chinese).

[6] Y.C. Guo, S.H. Zhang, M.Y. Li.Chinese Journal of Geotechnical Engineering, 2010,Vol.32(Supp.2),232-235(in Chinese).

[7] F.Y Liu, X.B. Yang, X. Liu. Chinese Journal of Geotechnical Engineering,2003,Vol.25, No.1,71 -75(in Chinese).

[8] J.J. Zheng, C. Han, X.Z. Wang. J. of HUST. (Urban Science Edition), 2007,Vol.24 , No.3,1-3(in Chinese).

[9] G.H. Yang. Chinese Journal of Rock Mechanics and Engineering,2008,Vol.27, No.4, 679–686(in Chinese).

[10] G.H. Yang. Chinese Journal of Geotechnical Engineering,2006,Vol.28, No.11, 1927–1931(in Chinese).

[11] Y.L. Qiao. Application of the undisturbed soil tangent modulus method on computation of finite compressible layer and nonlinear settlement of single pile [M. S. Thesis]. Guangzhou：South China University of Technology,2007(in Chinese).

[12] M.H. Zhao. Soil mechanics and foundation engineering. Wuhan: Wuhan University of Technology Press, 2003(in Chinese).