DYNAMIC CONSTRUCTION CONTROL METHOD FOR A DEEP FOUNDATION PIT WITH SAND-PEBBLE GEOLOGY

Authors

  • Xuansheng Cheng School of Civil Engineering, Lanzhou University of Technology, Lanzhou, No. 287, Langongping Road, 730050, China
  • Bingbing Luo School of Civil Engineering, Lanzhou University of Technology, Lanzhou, No. 287, Langongping Road, 730050, China
  • Haibo Liu School of Civil Engineering, Lanzhou University of Technology, Lanzhou, No. 287, Langongping Road, 730050, China
  • Qingchun Xia School of Civil Engineering, Lanzhou University of Technology, Lanzhou, No. 287, Langongping Road, 730050, China
  • Chaobo Chen C hina Railway 21st Bureau Group Co., LTD. No. 9 21 B eibinhe W est R oad, Lanzhou , C hina

DOI:

https://doi.org/10.14311/CEJ.2020.03.0026

Keywords:

Sand and pebble geology, Deep foundation pit, Numerical simulation, Dynamic control, Lateral displacement

Abstract

Taking the water-rich sand and pebble geology deep foundation pit of Jinfu Station of Chengdu Metro Line 6 as the research object, combined with the ladder excavation method of slotting, utilizing finite difference software FLAC 3D as well as on-site monitoring result, the deformation law of the diaphragm wall during the dynamic excavation of the foundation pit is analysed, and the influence of the relative stiffness between the vertical and horizontal walls of the foundation pit on the lateral deformation of the retaining structure is discussed. The results show that while using the ladder excavation method of slotting, the maximum lateral displacement of the underground diaphragm walls decreases gradually with the excavation depth of the foundation pit, which occurs at the intersection of the middle point of the oblique excavation line and the step distance section of the transverse excavation. Additionally, the lateral displacement increases closer to the excavation section. The lateral displacement of the envelope enclosure mainly depends on the relative constraint stiffness of the vertical and horizontal underground diaphragm wall of the foundation pit. The use of the ladder layered excavation method of slotting can effectively reduce the lateral displacement of the underground diaphragm wall. The simulated result and on-site monitoring result are nearly the same. These results can provide a corresponding theory and engineering basis for the selection of excavation methods for the same type of sand and pebble stratum foundation pit.

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References

Liao X.B., Chen Y., Zhu M., 1998. Design for anchor-shotcrete support structure and its application to protecting wall works of deep foundation pit in Chengdu area. The Chinese Journal of Geological Hazard and Control, Vol.9: 108-113. https://doi.org/10.16031/j.cnki.issn.1003-8035.1998.01.020

Yu J. L., Gong X.N., 1999. Spatial behavior analysis of deep excavation. Chinese Journal of Geotechnical Engineering, Vol. 21: 21-25.

Ou C., Hsieh P. G., Chou D. C., 1993. Characteristics of ground surface settlement during excavation. Canadian Geotechnical Journal, Vol.30, 758-767. https://doi.org/10.1139/t93-068

Wang J.H., Xu Z.H., Wang W.D., 2007. Analysis of deformation behavior of deep excavations supported by permanent structure. Chinese Journal of Geotechnical Engineering, Vol. 29: 1899-1903.

Ou C.Y., Chiou D.C., Wu T.S.,1996. Three-dimensional finite element analysis of deep excavations. Journal of Geotechnical Engineering, Vol. 122: 337-345. https://doi.org/10.1061/(ASCE)0733-9410(1996)122:5(337)

Wang J. H., Xu Z. H., Wang W. D., 2010. Wall and ground movements due to deep excavations in shanghai soft soils. Journal of Geotechnical and Geoenvironmental Engineering, Vol.136: 985-994. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000299

Tong J.J., Wang M.N., Yu L., et al., 2014. A study of the land subsidence around the deep foundation pit of the Chengdu subway station. Hydrogeology & Engineering Geology, Vol. 42:97-101. https://doi.org/10.16030/j.cnki.issn.1000-3665.2015.03.16

Finno R.J.，Blackburn J. T.，Roboski J. F., 2007. Three-dimensional effects for supported excavations in clay. Journal of Geotechnical and Geoenvironmental Engineering, Vol.133: 30-36. https://doi.org/10.1061/(ASCE)1090-0241(2007)133:1(30)

Feng C. L., Zhang D.L., 2018. The general deformation mode and its application of subway station foundation pit in sandy cobble stratum. Chinese Journal of Rock Mechanics and Engineering, 37:4395-4405.

https://doi.org/10.13722/j.cnki.jrme.2018.0722

Li S., Zhang D.L., Shao Y.D., 2019. Research on spatio-temporal law of deep excavation deformation under complicated environment in Beijing Subway Station. Journal of Beijing Jiaotong University, Vol. 43: 29-36. https://doi.org/10.11860/j.issn.1673-0291.20190040

Wang M.N., Zeng Z.Q., Zhao Y.T., et al., 2019. Study on deformation rules of earth’s surface and support structure for deep foundation pit in bad gradation pebble stratum. Journal of Railway Science and Engineering, Vol.16: 646-653. https://doi.org/10.19713/j.cnki.43-1423/u.2019.03.012

Brinkgreve R.B.J., Engin E., Swolfs W.M., et al., 2013. PLAXIS 3D 2013 User’s Manuals, The Netherlands: Plaxis BV, Delft.

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Published

2020-10-31

How to Cite

Cheng, X., Luo, B., Liu, H., Xia, Q., & Chen, C. (2020). DYNAMIC CONSTRUCTION CONTROL METHOD FOR A DEEP FOUNDATION PIT WITH SAND-PEBBLE GEOLOGY. Stavební Obzor - Civil Engineering Journal, 29(3). https://doi.org/10.14311/CEJ.2020.03.0026

Issue

Vol. 29 No. 3 (2020)

Section

Articles

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