Foundation structure selection of metro stations in Xi'an by PBA method

LAI Hong-peng; MA Xiao-jie

doi:10.19818/j.cnki.1671-1637.2024.02.008

Volume 24 Issue 2

Apr. 2024

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Article Navigation > Journal of Traffic and Transportation Engineering > 2024 > 24(2): 125-136

LAI Hong-peng, MA Xiao-jie. Foundation structure selection of metro stations in Xi'an by PBA method[J]. Journal of Traffic and Transportation Engineering, 2024, 24(2): 125-136. doi: 10.19818/j.cnki.1671-1637.2024.02.008

Citation:

LAI Hong-peng, MA Xiao-jie. Foundation structure selection of metro stations in Xi'an by PBA method[J]. Journal of Traffic and Transportation Engineering, 2024, 24(2): 125-136. doi: 10.19818/j.cnki.1671-1637.2024.02.008

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Foundation structure selection of metro stations in Xi'an by PBA method

doi: 10.19818/j.cnki.1671-1637.2024.02.008

LAI Hong-peng^1
,,
MA Xiao-jie^{1, 2}

1.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
2.
Guangzhou Metro Design and Research Institute Co., Ltd., Guangzhou 510010, Guangdong, China

Funds:

National Natural Science Foundation of China 51978064

National Natural Science Foundation of China 51908051

National Natural Science Foundation of China 52278391

More Information

Author Bio:
LAI Hong-peng(1979-), male, professor, PhD, laihp168@chd.edu.cn
Received Date: 2023-11-03
Publish Date: 2024-04-30

Abstract

Abstract

Based on the stratum characteristics in Xi'an, the structural bearing characteristics of different foundation types and the most unfavorable working conditions were analyzed, with the five metro stations under construction by the pile-beam-arch (PBA) method as the example. The foundation bearing capacity, horizontal shear resistance, anti-overturning capacity, anti-uplift of the foundation, and allowable horizontal displacement of the structure were selected as the basic criteria for evaluating the structural strength and stiffness safety of the foundation structure. The mechanical model of the foundation structure by PBA method was constructed, and the calculation formulas of the structural safety factors under different failure modes were deduced. Some suggestions on the safety factors values in the type selection theory system of the foundation structure by PBA method in Xi'an were put forward. The application scopes of single-row long pile foundation and strip foundation under the column in different strata and buried depths were given. Research results show that when the foundation structure by PBA method in Xi'an is calculated according to the basic criteria of foundation bearing capacity, horizontal shear resistance, anti-overturning capacity, anti-uplift of the foundation, and allowable horizontal displacement of the structure, the safety factors should be not less than 1.2, 1.3, 1.3, 1.6, and 1.4, respectively. The structure selection of the middle column foundation by PBA method is mainly affected by the vertical bearing capacity criterion of the foundation. When the same column span type is adopted, the applicability of the strip foundation under the column in the sandy soil stratum is better than that in the silty clay-sand interbedded stratum and silty clay stratum. The structural bearing capacity of the single-row long pile foundation can be improved by increasing the pile length. Theoretically, the applicability of the single-row long pile foundation under various stratum conditions is better than that of the strip foundation under the column. The composite criteria should be used to comprehensively analyze the applicability of the side pile foundation structure. The applicability of the strip foundation structure under the column is greatly affected by the stratum condition, and the anti-overturning safety of the structure is difficult to meet the requirements under the conditions of silty clay and silty clay-sand interbedded stratum. However, the single-row long pile foundation is mainly affected by its own structural strength and stiffness under various criteria, and there is no significant difference in the applicable burial depths in various strata. The single-row long pile foundation is more applicable for the metro station in Xi'an by PBA method, while the strip foundation under the column can meet the structural safety requirements by expanding the foundation width.
- metro station,
- pile-beam-arch method,
- foundation structure selection,
- safety judgment criterion,
- mechanical model,
- structural safety factor

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References(33)

References

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Foundation structure selection of metro stations in Xi'an by PBA method

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