Evaluation of the dynamic additional impact about foundation pit construction on the existing adjacent subway station with the PBA method
DOI:
https://doi.org/10.56748/ejse.23525Keywords:
Foundation pit, numerical calculation, PBA method, deformation rule, mechanical propertyAbstract
In this paper, relying on the Tianhe East Station project of Guangzhou Subway Line 11, the deformation and mechanical evolution rules about the existing adjacent stations with the pile-beam-arch (PBA) method in the all excavation stages about the new foundation pit is evaluated through numerical calculation method. It was revealed that that the largest displacement about the existing station’s side wall and the middle column reaches 2.1mm and 1.5mm respectively during the excavation about the foundation pit. Due to the impact about construction of the foundation pit, the uplifting phenomenon occurs on the side of the foundation pit, and the maximum uplifting value reaches 0.4mm. When the construction about foundation pit is finished, the whole station floor shows a deformation form of “left lower torsion”, and the largest compressive stresses as well as tensile stresses about the side wall and the bottom plate do not reach the standard limiting value, and the whole is being a relative safe status. With the increase about the excavation depths, the axial forces about the middle column gradually increase to 7016kN, and the incremental axial forces about the middle column after the construction is completed accounts for about 11.7% of the axial force of initial construction. Therefore, the disturbance effect about foundation pit construction on the adjacent station with the PBA method can not be ignored. The research result in this paper may offer some important references for the construction and design of similar cases.
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Chen, Y.M., Xu, D.P. 2013. FLAC/FLAC3D foundation and engineering application. China Water and Power Press, Beijing. (in Chinese)
Cheng, Y.L., Wang, Y.H. 2019. Analysis on mutual deformation influence between deep soft soil foundation pit and adjacent metro station. Urban Mass Transit, 22(9): 14-20.
Fang, W., Zhang, H.J., Gao, S.F., Zheng, Y.C., Liu, G.N. 2022. Mechanical characteristics and deformation law of tunnel in diatomite considering various softening conditions. Stavební obzor-Civil Engineering Journal, 31(3), 504-515. DOI: https://doi.org/10.14311/CEJ.2022.03.0038
Guo, D.T., Zhou, C.Y. 2015. Influence of foundation pit excavation approaching a metro station. Modern Tunnelling Technology, 52(1): 156-162.
Hai, M.L., Sun, Y.Y., Wang, B.L. 2009. On deformation influence of deep excavation adjacent to subway station. Journal of East China Jiaotong University, 26(1): 7-11.
Jiang, Z.P. 2019. Analysis of the effect of foundation pit excavation method on structure deformation of rail transit. Journal of Railway Engineering Society, 36(6): 86-90.
Ke, M.Z., Li, Y.M., Wang, J., Zhu, K.J., Chen, X.W. 2023. Analysis of the influence of foundation pit excavation on deformation of adjacent subway tunnels based on numerical simulation. Building Structure, 53(S1): 2837-2841.
Liu, Y.S., Huang, Y.Y. 2023. The surface settlement law of precipitation in pile-beam-arch station adjacent to pile foundation. KSCE Journal of Civil Engineering, 27: 1441-1457. DOI: https://doi.org/10.1007/s12205-023-2192-4
Li, X.H., Wang, H.T., Yang, C.H., Jia, J.Q., Hu, G.Z. 2005. Discussion about development and utilization of underground space in mountain city. Chinese Journal of Underground Space and Engineering, 1(3): 319-322.
Liu, J.Q., Ou, X.F., Zhang X.M., Liang Q.H., Yang J.S., Liu X.Q. 2014. Study on effects of group foundation pits excavation on heaving/settlement of adjacent metro tunnel in operation. Modern Tunnelling Technology, 51(4): 81-87.
Li, J.Z., Yang, H.J., Feng, J.L. 2023. Analysis and optimization of tunnel excavation scheme with pile-beam-arch. Science Technology and Engineering, 23(1): 307-313.
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. DOI: https://doi.org/10.56748/ejse.234433
Sui, Y., Cheng, X.H., Wei, J.X. 2021. Distributed fibre optic monitoring of damaged lining in double-arch tunnel and analysis of its deformation mode. Tunnelling and Underground Space Technology, 110, 103812. DOI: https://doi.org/10.1016/j.tust.2021.103812
Vali, R., Saberian, M., Beygi, M., Porhoseini, R., Abbaspour, M. 2020. Numerical analysis of laterally loaded single-pile behavior affected by urban metro tunnel. Indian Geotechnical Journal, 50(3): 1-16. DOI: https://doi.org/10.1007/s40098-019-00375-5
Wang, Z.J., Zhou, F.C., Zhou, P., Jiang, Y.F., Deng, S.M., Ren, R. 2020a. Research on deformation theory of existing stations based on single side excavation and unloading of large foundation pits with strong close connection. Chinese Journal of Rock Mechanics and Engineering, 39(10): 2131-2147.
Wang, L.X., Li, C.J., Wang, K., Bai, Y.Y. 2020b. Displacement analysis and control standards of foundation pit construction in loess area. Railway Standard Design, 64(4): 123-129.
Wang, L.X., Xu, S.S., Wang, J., Shi, W.S.Y., Yu, D.Q., Qiu, J.L., Fan, F.F. 2022. Analysis on influence of excavation of pit on existing metro tunnel in loess layer. Science Technology and Engineering, 22(6): 2468-2476.
Weng, Z.J. 2021. Influence of deep foundation pit construction on deformation of adjacent subway station. China Science Paper, 16(10): 1055-1060.
You, X.H., He, G.Y., Wang, Q.X., Zhang, L. 2019. Current status and development trend of urban underground space in China. Tunnel Construction, 39(2): 173-188.
Yu, Q.P., Chen, Z.J. 2022. Analysis of influence of foundation pit construction on adjacent operational subway structure. Modern Tunnelling Technology, 59(S1): 502-508.
Yu, L., Zhang, D.L., Fang, Q., Cao, L.Q., Xu, T., Li, Q.Q. 2019. Surface settlement of subway station construction using pile-beam-arch approach. Tunnelling and Underground Space Technology, 90: 340-356. DOI: https://doi.org/10.1016/j.tust.2019.05.016
Yang, F. 2021. Numerical simulation analysis of surface deformation law in certain Xi’an metro station with PBA construction. Urban Mass Transit, 24(12): 43-48.
Zhao, J.P., Tan, Z.S., Yu, R.S., Li, Z.L., Wang, X.Y. 2023a. Mechanical responses of a shallow-buried super-large-section tunnel in weak surrounding rock: A case study in Guizhou. Tunnelling and Underground Space Technology, 131, 104850. DOI: https://doi.org/10.1016/j.tust.2022.104850
Zhao, J.P., Tan, Z.S., Wang, W.X., Yu, R.S., Wang, J.J., Li, Z.L. 2023b. Study on the large deformation control technology of a single-hole double-track railway tunnel. Bulletin of Engineering Geology and the Environment, 82, 343. DOI: https://doi.org/10.1007/s10064-023-03375-1
Zhao, J.P., Tan, Z.S., Wang, X.Y., Zhou, Z.L., Li, G.L. 2022a. Engineering characteristics of water-bearing weakly cemented sandstone and dewatering technology in tunnel excavation. Tunnelling and Underground Space Technology, 121, 104316. DOI: https://doi.org/10.1016/j.tust.2021.104316
Zhao, J.P., Tan, Z.S., Li, Q.L., Li, L. 2023c. Characteristics and mechanism of large deformation of squeezing tunnel in phyllite stratum. Canadian Geotechnical Journal, 1-16. DOI: https://doi.org/10.1139/cgj-2022-0699
Zhao, J.P., Tan, Z.S., Yu, R.S., Li, Z.L., Zhang, X.R., Zhu, P.C. 2022b. Deformation responses of the foundation pit construction of the urban metro station: a case study in Xiamen. Tunnelling and Underground Space Technology, 128: 104662. DOI: https://doi.org/10.1016/j.tust.2022.104662
Zhao, X., Wang, H.X., Li, Z.W., Dai, G.L., Yin, Z.W., Cao, S.N., Zhou, J.L. 2022. Numerical study on the deformation of tunnels by excavation of foundation pit adjacent to the subway. Applied Sciences, 12(9): 4752. DOI: https://doi.org/10.3390/app12094752
Zhang, Z.B., Zhou, J.D., Xu, F., Liu, Z.C., Sun, M.L. 2023. Calculation method of the finite soil pressure for a new foundation pit adjacent to an existing subway station. Applied Sciences, 13(3): 1994. DOI: https://doi.org/10.3390/app13031994
Zhang, A.M., Wang, N. 2020. Influence analysis of large building foundation pit construction on adjacent metro station. Urban Mass Transit, 23(10): 53-57.
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Copyright (c) 2023 Lijun Wang, Yongxing Dai, Zekun Chen, Huijian Zhang, Gongning Liu
This work is licensed under a Creative Commons Attribution 4.0 International License.
