Experimental study on large-scale subway station model considering adjustable water and soil pressure

Abstract

To investigate the structural stress conditions during the excavation and failure stages of subway stations under adjustable water and soil pressures, a 1∶10 scaled model was created based on similarity theory. Considering the equivalent soil pressure load, the loading procedures that controlled the excavation and failure of a metro station created via the cover excavation reverse construction method were evaluated. Additionally, an excavation unloading device and an external soil pressure-based graded loading device were developed for a metro station created via the cover excavation reverse construction method. By comparing the experimental results with the finite element simulation results, the axial force variations in the balance props during the excavation process were revealed, and the crack development process of the metro station was summarized. The external soil pressure remained unchanged; furthermore, the increase in the axial force of the balance props was negatively correlated with the distance to the previous balance prop and positively correlated with the axial force of the previous balance prop at the time of unloading. According to the graded soil pressure load and the corresponding crack initiation, development, and structural failure states, the model failure process was divided into four stages: the no-crack stage, initial cracking stage, crack penetration stage, and local damage stage. The first cracks in the station structure appeared at the corners and centers of the excavation openings. The first penetration of transverse cracks appeared in the middle of the basement first-floor wall. The cracks at the excavation opening corners and middle locations developed obliquely, forming an overall horseshoe shape. Localized damage first occurred at the corners where concrete spalled, exposing the reinforcement.

Keywords

Water and soil pressure / Cover excavation reverse construction / Loading device design / Model experiment / Finite element simulation

Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

CRediT authorship contribution statement

Dongbo Zhou: Writing - original draft, Validation, Formal analysis, Visualization, Investigation, Data curation. Yuan Mei: Supervision, Funding acquisition, Writing - review & editing, Methodology, Conceptualization. Xin Ke: Validation, Visualization. Ziyang Liu: Resources, Validation. Wangyang Xu: Resources.

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgement

The research described in this paper was financially supported by the National Natural Science Foundation of China (Grant No. 52178302) and the Key R&D Projects in Shaanxi Province (No. 2020SF-373).

References

[1] Chang, Y., Wan, L., Mo, D., Hu, D., & Li, S. (2022). Tensile damage of reinforced concrete and simulation of the four-point bending test based on the random cracking theory. Computer and Concrete, 30(4), 289-299.

[2] Chen, Y., Jia, P., & Ji, X. (2021). Investigation into the performance of a covered top-down pit-in-pit deep excavation in shenzhen soil-rock mixed strata. Arabian Journal for Science and Engineering, 46(11), 10419-10437.

[3] Du, X., Li, Y., Dong, X., & Han, K. (2024). Large deformation induced soil pressure changes in a loess tunnel. Engineering Failure Analysis, 163, 108568.

[4] Du, Y., Fu, S., & Zhao, Y. (2022). Theoretical calculations and field measurements of the Earth pressure in the jinci tunnel. Soil Mechanics and Foundation Engineering, 59(1), 77-84.

[5] Elbelbisi, A., El-Sisi, A., Elgholmy, L., Helal, Z., Elemam, H., Saucier, A., & Salim, H. (2024). Experimental study on non-load bearing multi-span sandwich wall panels for blast mitigation. Journal of Building Engineering, 98, 110968.

[6] Fu, Q., & Li, L. (2020). Vertical load transfer behavior of composite foundation and its responses to adjacent excavation: centrifuge model test. Geotechnical Testing Journal, 44(1), 191-204.

[7] Ganesh, P., & Ramachandra Murthy, A. (2023). Flexural fatigue strains of constituent materials in strengthened RC beams with UHPC strips. International Journal of Fatigue, 167, 107351.

[8] Guo, P., Lei, G., Luo, L., Gong, X., Wang, Y., Li, B., Hu, X., & Hu, H. (2022). Soil creep effect on time-dependent deformation of deep braced excavation. Advances in Materials Science and Engineering, 2022(1), 5655592.

[9] Jamsawang, P., Jamnam, S., Jongpradist, P., Tanseng, P., & Horpibulsuk, S. (2017). Numerical analysis of lateral movements and strut forces in deep cement mixing walls with top-down construction in soft clay. Computers and Geotechnics, 88, 174-181.

[10] Jin, Y., Di, H., Zhou, S., Liu, H., Wu, D., & Guo, H. (2024). Effects of active axial force adjustment of struts on support system during pit excavation: Experimental study. Journal of Geotechnical and Geoenvironmental Engineering, 150(5), 4024027.

[11] LeBlanc, J. M., Brachman, R. W. I., & Zarpeima, A. (2024). Design-truck ultimate limit states of buried modular polymer stormwater collection structures. Canadian Geotechnical Journal, 61(7), 1368-1384.

[12] Ma, X., & Cao, M. (2024). Evaluation of deformation for two-dimensional (2D) and three-dimensional (3D) braced excavation in clays with centrifuge modelling and numerical analysis. Canadian Geotechnical Journal, 61(12), 2785-2805.

[13] Ma, X., & Liu, L. (2023). Fatigue properties of RC beams reinforced with ECC layer and steel plate. Construction and Building Materials, 372, 130799.

[14] Marzec, I., & Tejchman, J. (2022). Experimental and numerical investigations on RC beams with stirrups scaled along height or length. Engineering Structures, 252, 113621.

[15] Mei, Y., Zhou, D., Wang, H., Ke, X., Liu, Z., Tian, X., & Wang, Z. (2024). Study on carbon emission calculation during the materialization phase of subway stations and comparative analysis of carbon emissions from various construction methods. Case Studies in Construction Materials, 21, e03923.

[16] Meral, Ç., Temel, B. A., & Başağa, H. B. (2024). Choosing the right construction method: A comparative study of cost and timeline for top-down and bottom-up approaches. Buildings, 14(8), 2381.

[17] Pham, K. V. A., Kim, Y.-N., Woo, S., Kim, S. J., Lee, G., & Lee, K. (2024). Experimental-FEA investigation of the structural performance of steel box connector in precast concrete connection. Journal of Building Engineering, 95, 110077.

[18] Shi, G., Yang, X., Sun, J., Tao, Z., & Sousa, L. R. E. (2024). Experimental study on the control characteristics of the negative poisson’s ratio structural anchor cable on the large deformation of rainfall-induced landslide. Bulletin of Engineering Geology and the Environment, 83(4), 134.

[19] Sun, S., Guo, Y., Gui, P., Xing, L., & Mei, K. (2023). Flexural behaviour of steel-basalt fibre composite bar-reinforced concrete beams. Engineering Structures, 289, 116246.

[20] Sun, Y., Che, Y., Gu, Z., Wang, R., & Fan, Y. (2022). Measured structural response of a long irregular pit constructed using a top-down method. Geomechanics and Engineering, 31, 489-503.

[21] Vuong, T.-N.-H., Nguyen, T.-K., Nguyen, D.-L., Le, H.-V., & Tran, N.-T. (2023). Fiber fraction-dependent flexural behavior of high-performance fiber-reinforced concrete under static and repeated loading. Journal of Building Engineering, 79, 107808.

[22] Wang, S.-Q., Feng, D.-C., & Wu, G. (2022). Design and bearing capacity test of prefabricated high-strength thin concrete segments for reinforcing underground box culverts. Engineering Failure Analysis, 142, 106844.

[23] Wang, Y., Pan, X., Xu, H., Liu, J., Li, P., He, L., & Zhang, W. (2024a). Characteristics analysis for high-rise buildings during top-down construction. Journal of Civil Engineering and Management, 30(4), 326-342.

[24] Wang, Y., Zhang, D., Zhao, J., Du, Q., & Mubizah, R. (2024b). Seismic behavior of exterior joint of CFDST column to steel beam with RC slab. Journal of Building Engineering, 97, 110861.

[25] Xu, X., Zheng, Y., Lan, X., Pan, J., & Wen, Y. (2024). Numerical simulation analysis of controlling settlement by water-resisting curtain combined with recharge in deep foundation pit. Journal of Civil Engineering and Management, 30(7), 566-580.

[26] Xue, Y., Dai, W., Wang, X., Li, C., & He, J. (2024). Development of OFDR-based inclination sensor for deformation measurement of foundation pile. Measurement, 231, 114618.

[27] Zhang, J. (2024). Pounding induced overturning resistance of FPB-isolated structures considering soil-structure-interactions. Soil Dynamics and Earthquake Engineering, 177, 108416.

[28] Zhang, M., Xie, Z., & Li, P. (2022). Bearing capacity and failure behavior of disconnectable coupling joint with double row wedges (DCJD) used in the prestressed internal bracing. Underground Space, 7(4), 498-513.

[29] Zhang, Q., Hu, J., Wang, J., He, P., Hou, L., Lin, P., & Song, S. (2021). Study on the mechanical behavior of a foundation pit retaining structure adjacent to the pile foundation of a subway station. Environmental Earth Sciences, 80(20), 704.

[30] Zhang, S., Gao, J., Liu, C., Li, P., Yang, Z., & Lu, X. (2024). Model test on the collapse mechanism of subway tunnels in the soil-sand-rock composite strata. Engineering Failure Analysis, 162, 108356.

[31] Zhang, T., Li, X., Hou, Z., Chen, Q., Fang, Y., & Sun, W. (2025). An improved damage plastic model for RC structure FE modelling under cyclic loading conditions. Engineering Structures, 322, 119135.

[32] Zheng, X., Zhang, C., Gao, S., & Wang, F. (2023). Predicting the bond strength between steel wire and mortar based on interfacial porosity and shrinkage. Journal of Building Engineering, 68, 106188.

[33] Zhou, D., Mei, Y., Ke, X., Liu, Z., & Xu, W. (2024). Study on the structural behavior and reinforcement design of openings in subway station floor slabs. Journal of Building Engineering, 98, 110994.

[34] Zhou, Y., Ye, Z., Zhao, D., Huang, Z., & Yang, L. (2023). Static and multi-impact performances of RC beams strengthened with large rupture-strain FRP composites. Composite Structures, 316, 117053.

[35] Zhuang, H., Yang, J., Chen, S., Dong, Z., & Chen, G. (2021). Statistical numerical method for determining seismic performance and fragility of shallow-buried underground structure. Tunnelling and Underground Space Technology, 116, 104090.