Browse > Article
http://dx.doi.org/10.12989/gae.2017.13.6.929

Calculation models and stability of composite foundation treated with compaction piles  

Cheng, Xuansheng (Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology)
Jing, Wei (Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology)
Publication Information
Geomechanics and Engineering / v.13, no.6, 2017 , pp. 929-946 More about this Journal
Abstract
Composite foundation treated with compaction piles can eliminate collapsibility and improve the bearing capacity of foundation in loess area. However, the large number of piles in the composite foundation leads to difficulties in the analysis of such type of engineering works. This paper proposes two simplified methods to quantify the stability of composite foundation treated with a large number of compaction piles. The first method is based on the principle of making the area replacement ratios of the simplified model as the same time as the practical engineering situation. Then, discrete piles arranged in a triangular shape can be simplified in the model where the annular piles and compacted soil are arranged alternately. The second method implements equivalent continuous treatment in the pile-soil area and makes the whole treated region equivalent to a type of composite material. Both methods have been verified using treated foundation of an oil storage tank. The results have shown that the differences in the settlement values obtained from the water filled test in the field and those calculated by the two simplified methods are negligible. Using stability analysis, the difference ratios of the static and dynamic safety factors of the composite foundation treated with compaction piles calculated by these two simplified methods are found to be 3.56% and 5.32%, respectively. At the same time, both static and dynamic safety factors are larger than the general safety factor, which should be greater than or equal to 2.0 according to the provisions in civil engineering. This indicates that after being treated with compaction piles, the bearing capacity of the composite foundation is effectively improved and the foundation has enough safety reserve.
Keywords
composite foundation; compaction piles; stability; safety factor; soil-structure interaction;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Zhao, S.Y., Zheng, Y.R. and Deng, D. (2003), "Stability analysis of jointed rock slope by strength reduction FEM", Chin. J. Rock Mech. Eng., 22(2), 254-260.
2 American Petroleum Institute 650 (2007), Weld Steel Tanks for Oil Storage (API-650), API Publishing Services, Washington, U.S.A.
3 Cao, L.J., Zhao, J.H. and Wei, X.Y. (2006), "Stress analysis of lime-soil compacted pile based on the unified strength theory", Rock Soil Mech., 27(10), 1786-1790.
4 Chen, Q., Huang, Z.Y., Zuo, R.Y. and Xu, X. (2001), "Behavior of combined composite ground and simulation study by FEM", Chin. Civ. Eng. J., 34(1), 50-55.
5 Cheng, X.S. and Zheng, Y.R. (2011), "Calculation discussion about safety factor of unlined loess tunnel wall rock structure under earthquake", Rock Soil Mech., 2(3), 761-766.
6 Cook, R.W. (1980), "Jacked piles in London clay: Interaction and groups behavior under working conditions", Geotech., 30(2), 97-136.   DOI
7 Cui, Y., Zhao, J.H., Zhang, C.G. and Sun, S.S. (2013), "Radius calculation of compacted zone in lime-soil composite foundation based on unified strength theory", Rock Soil Mech., 34(4), 1116-1120.
8 Ding, J.H., Zhang, Q.H., Li, Z.H. and Qi, Y.S. (1996), "Numerical computation and analysis of the settlement of gravel pile composite foundation of larger scale oil tank", Site Invest. Sci. Technol., 6, 32-35.
9 Fattah, M.Y., Salman, F.A., Al-Shakarchi, Y.J. and Raheem, A.M. (2013), "Coupled pile-soil interaction analysis in undrained condition", J. Centr. South U., 20, 1376-1383.   DOI
10 GB5007 (2010), Code for Design of Building Foundation, China Architecture and Building Press, Beijing, China.
11 Ghazavi, M., Ravanshenas, P. and Lavasan, A.A. (2014), "Analytical and numerical solution for interaction between batter pile group", KSCE J. Civ. Eng., 18(7), 2051-2063.   DOI
12 Hasan, G. and Mehrnaz, A. (2011), "Pile-soil-pile interaction in pile groups with batter piles under dynamic loads", Soil Dyn. Earthq. Eng., 31(8), 1159-1170.   DOI
13 He, Q., Wang, D.J., Liang, W.W., Peng, L. and Fu, X. (2012), "The dynamic stability analysis of pile-net composite foundation", Chin. J. Undergr. Sp. Eng., 8(4), 761-766.
14 Matsul, T. and San, K.C. (1992), "Finite element slope stability analysis by shear strength reduction technique", Soil. Found., 31(2), 59-70.
15 Jiang, Y., Han, J. and Zheng, G. (2014), "Influence of column yielding on degree of consolidation of soft foundations improved by deep mixed columns", Geomech. Eng., 6(2), 173-194.   DOI
16 Kahyaoglu, M.R., Imancli, M., Onal, O. and Kayalar, A.S. (2012), "Numerical analyses of piles subjected to lateral soil movement", KSCE J. Civil Eng., 16(4), 562-570.   DOI
17 Liang, M.Y. (2013), "Numerical simulation analysis of dynamic responses of the 100,000 cubic meter liquid-storage tank", M.Sc. Dissertation, Harbin Institute of Technology, Harbin, China.
18 Liu, H.J., Yang, Z.Q. and Wang, X.H. (2014), "Study on finite element analysis of differential settlement in soft foundation of large-scaled oil tank", Per. Ocean U. Chin., 44(5), 89-94.
19 Ma, Y.F., Zhou, D.H., Zhang, Z.H. and Cao, L.Q. (2016), "In-situ test and simulation of CFG-pile composite foundation in a large petrochemical project", Per. Ocean U. Chin., 46(1), 86-92.
20 Mi, H.Z. and Yang, P. (2012), "A field experimental study of compacted piles in collapsible loess foundation", Rock Soil Mech., 33(7), 1951-1950.
21 Sarkar, R. and Maheshwari, B.K. (2011), "Effects of separation on the behavior of soil-pile interaction in liquefiable soils", J. Geomech., 12, 1-13.
22 Shi, M.S. (1983), "A study of the effect of compacted soil during pile installation clay", J. Build. Struct., 4(1), 60-71.
23 Hu, B., Mei, L., Mei, G.X. and Zai, J.M. (2009), "Finite element method for selecting the soil boundary in the model of pile-soil", Build. Sci., 25(9), 18-20.
24 Yang, T. and Yin, Z.Z. (1998), "Finite element analysis of composite ground based on composite constitutive model", Rock Soil Mech., 19(2), 19-25.
25 Tan, F.Y., Wang, R. and Zhao, L. (2011), "Numerical calculation for bearing performances of composite foundation improved by flexible piles", Rock Soil Mech., 32(1), 288-292.
26 Ukritchon, B., Faustino, J.C. and Keawsawasvong, S. (2016), "Numerical investigations of pile load distribution of pile group foundation subjected to vertical load and large moment", Geomech. Eng., 10(5), 577-598.   DOI
27 Wang, M.C. and Shao, M. (2000), Basic Principle and Numerical Method of Finite Element Method, Tsinghua University Press, Beijing, China.
28 Yasser, K. and Ahmed, A.M. (2014), "Numerical analysis of pile-soil interaction under axial and lateral loads", J. Concrete Struct. Mater., 8(3), 239-249.   DOI
29 Ying, H.W., Yang, X.G., Bian, S.Z, Pan, Q.Y. and Xie, K.H. (2005), "Analysis of field test on the foundation of a large oil tank", Chin. J. Geotech. Eng., 27(2), 157-161.
30 Zhao, M.H., Long, J., Zhang, L., Ma, B.H. and He, L.P. (2013), "Comparative analysis of model tests on different types of composite foundations", Chin. J. Geotech. Eng., 35(4), 611-618.