Research on the mechanics differences between single-row and double-row side piles of station using the PBA method

Xingkai  Pei; Jing Sun; Guangyao Guo; Xuemin Zhou; Shuai Zhang

doi:10.56748/ejse.24536

Authors

Xingkai Pei Guangzhou Metro Design and Research Institute Co.
Jing Sun Guangzhou Metro Design & Research Institute Co.
Guangyao Guo Southwest Jiaotong University
Xuemin Zhou Southwest Jiaotong University
Shuai Zhang Southwest Jiaotong University

DOI:

https://doi.org/10.56748/ejse.24536

Keywords:

PBA method, MSPP, Mechanical differences, Deformation characteristics, Soil arching effect

Abstract

The side pile is a crucial mechanical component in station construction using the PBA (pile-beam-arch) method, and its stability during the construction process cannot be overstated. The mechanical differences between single-row and double-row side piles in this construction method have garnered significant attention, yet few studies have been conducted on this matter. Therefore, this paper employs numerical simulation to compare the deformation and mechanical properties of single-row and double-row side piles (the adopted pile type is micro steel pipe pile, abbreviated as MSPP) in a metro station using the PBA method. The findings are validated through the model experiment. It is found that the soil arch effect created by the front-row pile of the double-row piles serves as the primary lining, offering a certain shielding effect to the soil stress behind the back-row pile. Notably, the soil stress values in double-row pile conditions are slightly higher compared to single-row pile condition, leading to a noticeably smaller final deformation of the pile top. The combined bending moments and axial forces of the front-row and back-row piles in double-row piles exceed those of a single-row pile. Specifically, bending moments are highest in single-row piles, followed by front-row piles and then back-row piles, while axial forces are highest in single-row piles, followed by back-row piles and then front-row piles. This suggests that the bending moments and axial forces of double-row piles are smaller than those of a single-row pile. The internal force distribution within the double-row pile is more balanced, thereby enhancing the lining strength and improving the station’s safety through the PBA method. The findings in this paper can serve as valuable references for the design and construction of similar projects.

Downloads

Download data is not yet available.

References

Cheng, X.S., Gong, L.J., Liu, G.N. 2021. Bearing capacity characteristics and differential settlement of composite foundation with column-hammered and thrusted-expanded piles. International Journal of Geomechanics, 21(9): 04021164. https://doi.org/10.1061/(ASCE)GM.1943-5622.0002050 DOI: https://doi.org/10.1061/(ASCE)GM.1943-5622.0002050

Chen, Y.M., Xu, D.P. 2013. FLAC/FLAC3D foundation and engineering application. China Water and Power Press, Beijing. (in Chinese).

Guo, X.Y., Wang, Z.Z., Geng, P., Chen, C.J, Zhang, J. 2021. Ground surface settlement response to metro station construction activities using pile-beam-arch method. Tunnelling and Underground Space Technology, 108: https://doi.org/10.1016/j.tust.2020.103729 DOI: https://doi.org/10.1016/j.tust.2020.103729

Luo, W.L., Liu, C.W., Han, X. 2007. Numerical simulation of behaviour of piled foundation influenced by tunneling. Rock and Soil Mechanics, 28: 403-407. (in Chinese) https://doi.org/10.16285/j.rsm.2007.s1.131

Liu, J.Z., Sun, L.C., Zhang, Z., Xu, H., Ding, G.P. 2018. Study on mechanical effect of PBA Method in metro station. Chinese Journal of Underground Space and Engineering, 14(S1): 240-247. (in Chinese).

Li, T., Li, Y., Yang, T.Y., Hou, R., Gao, Y., Liu, B., Qiao, G.G. 2023. Influence of the large-span pile-beam-arch construction method on the surface deformation of a metro station in the silty clay-pebble composite stratum. Materials, 16(7): 2934. https://doi.org/10.3390/ma16072934 DOI: https://doi.org/10.3390/ma16072934

Lv, J.B., Lu, J.J., Wu, H. 2023. Study on the mechanical characteristics and ground surface settlement influence of the rise–span ratio of the pile-beam-arch method. Applied Sciences, 13(9): 5678. https://doi.org/10.3390/app13095678 DOI: https://doi.org/10.3390/app13095678

Li, C.J. 2022. Research on adaptability of PBA improved construction method for underground station in loess area. Railway Standard Design, 66(6): 97-104. (in Chinese) https://doi.org/10.13238/j.issn.1004-2954.202102190006

Lai, H.J., Zheng, J.J., Zhang, J. 2014. DEM analysis of “soil”-arching within geogrid-reinforced and unreinforced pile-supported embankments. Computers and Geotechnics, 61: 13-23. https://doi.org/10.1016/j.compgeo.2014.04.007 DOI: https://doi.org/10.1016/j.compgeo.2014.04.007

Li, J.K., Chen, P. 2020. Comparative analysis of group cave effect in construction of metro station by pile-beam-arch (PBA) method. Science Technology and Engineering, 20(14): 5737-5742. (in Chinese). https://doi.org/10.3969/j.issn.1671-1815.2020.14.042

Liu, X.L., Li, B. 2012. Analysis of supporting mechanism of micro-steel-pipe piles in rock foundation pit. Rock and Soil Mechanics, 33(S1): 217-222. (in Chinese). https://doi.org/10.16285/j.rsm.2012.s1.035

Lim, A., Ou, C.Y. 2017. Stress paths in deep excavations under undrained conditions and its influence on deformation analysis. Tunnelling and Underground Space Technology, 63: 118-132. https://doi.org/10.1016/j.tust.2016.12.013 DOI: https://doi.org/10.1016/j.tust.2016.12.013

Sun, J., Pei, X.K., Yang, C., Zhu, B.Z. 2023. Dynamic response analysis of the process of the utility shield tunnel under-passing the operating subway tunnel. Electronic Journal of Structural Engineering, 23(3): 44-52. https://doi.org/10.56748/ejse.234433 DOI: https://doi.org/10.56748/ejse.234433

Wang, T., Luo, F.R., Liu, W.N., Li, X.G. 2012. Study of surface settlement and flexible joint pipeline deformation induced by metro station construction with PBA method. China Civil Engineering Journal, 45(2): 155-161. (in Chinese). https://doi.org/10.15951/j.tmgcxb.2012.02.005

Wang, X.Y., Lei, K., Wang, T., Zhang, J.G. 2021. Prediction of existing pipeline settlement resulting from the construction of an underground metro station using the pile-beam-arch (PBA) method. China Civil Engineering Journal, 54(S1): 65-75. (in Chinese). https://doi.org/10.15951/j.tmgcxb.2021.s1.005

Wang, Z.Z., Guo, X.Y. 2016. Research on ground settlement of metro station construction by PBA method. Journal of Dalian University of Technology, 56(3): 257-262. (in Chinese). https://doi.org/10.7511/dllgxb201603006

Wang, X.Y. 2021. Application research on deep collapsible loess foundation treatment by gravel pile. Chinese Journal of Underground Space and Engineering, 17(4): 1164-1170. (in Chinese)

Yu, L., Zhang, D.L., Fang, Q., Cao, L.Q., Xu, T., Li, Q.Q. 2019. Surface settlement of metro station construction using pile-beam-arch approach. Tunnelling and Underground Space Technology, 90: 340-356. https://doi.org/10.1016/j.tust.2019.05.016 DOI: https://doi.org/10.1016/j.tust.2019.05.016

Zeng, Y., Bai, Y., Zou, Y., Huang, B. 2022. Numerical study on stratigraphic and structural deformation patterns considering surface load with pile-beam-arch method construction. Symmetry, 14(9): 1892. https://doi.org/10.3390/sym14091892 DOI: https://doi.org/10.3390/sym14091892

Zhao, J.P., Tan, Z.S., Yu, R.S., Li, Z.L., Zhang, X.R., Zhu, P.C. 2022. Deformation responses of the foundation pit construction of the urban metro station: a case study in Xiamen. Tunnelling and Underground Space Technology, 128: 104662. https://doi.org/10.1016/j.tust.2022.104662 DOI: https://doi.org/10.1016/j.tust.2022.104662

Zhu, W.W., Xi, Y., Liu, B.T., Liu, Y., Yang, K., Li, Z., Yang, X., Wang, B.Y. 2023. Monitoring and discussion on distribution mode of earth pressure behind piles under the pile-supporting system in a deep foundation pit. Building Structure, 53(17): 134-140. (in Chinese). https://doi.org/10.19701/j.jzjg.ls210218

Zhang, S. 2023. Study on the selection and construction mechanical behavior of side pile in metro station using pile-beam-arch method. Master’s thesis, Southwest Jiaotong University.

Zhang, H.J., Liu, G.N., Liu, W.X., Zhang, S., Chen, Z.K. 2023. Mechanical evolution law and deformation characteristics of preliminary lining about newly-built subway tunnel closely undercrossing the existing station: A case study. Geomechanics and Engineering, 35(5), 525-538. https://doi.org/10.12989/gae.2023.35.5.525

Zhang, D.S., Zhang, X.L., Tang, H.T., Zhao, Z.Q., Guo, J., Zhao, H.H. 2023. Effects of soil arching on behavior of composite pile supporting foundation pit. Computational Particle Mechanics, 10: 645-662. https://doi.org/10.1007/s40571-022-00518-1 DOI: https://doi.org/10.1007/s40571-022-00518-1