Study on the control theory and design method of progressive collapse in excavations retained by cantilever piles

ZHENG Gang; ZHU Xiao-wei; CHENG Xue-song; LEI Ya-wei; WANG Ruo-zhan; ZHAO Jing-zhang; YI Fan

doi:10.11779/CJGE202106001

Volume 43 Issue 6

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Chinese Journal of Geotechnical Engineering > 2021 > 43(6): 981-990. > DOI: 10.11779/CJGE202106001

ZHENG Gang, ZHU Xiao-wei, CHENG Xue-song, LEI Ya-wei, WANG Ruo-zhan, ZHAO Jing-zhang, YI Fan. Study on the control theory and design method of progressive collapse in excavations retained by cantilever piles[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(6): 981-990. DOI: 10.11779/CJGE202106001

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Study on the control theory and design method of progressive collapse in excavations retained by cantilever piles

1.
MOE Key Laboratory of Coast Civil Structure Safety, Tianjin University, Tianjin 300072, China
2.
Department of Civil Engineering, Tianjin University, Tianjin 300072, China

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Received Date: August 19, 2020
Available Online: December 02, 2022

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Abstract

Abstract

The progressive collapse problems in excavation engineering have attracted the attention of engineers and academic scholars. However, the relevant control theory has not been established. Based on the progressive collapse mechanism of excavations retained by cantilever piles, a method for alternately setting progressive failure blocking units (abbreviated as blocking unit method) to control the development of progressive failure is proposed. The effects of blocking units under different excavation depths, soil conditions and stiffnesses of reinforced piles are analyzed by the finite difference method. Furthermore, based on the load transfer coefficient curve, the design principles of blocking units under different stiffnesses of the reinforced piles are summarized. The results show that the reasonable design of blocking units can effectively control the progressive failure caused by the partial failure within the setting range. However, when the number of the reinforced piles in the blocking unit is insufficient, the progressive failure has crossover effect, which means the progressive failure continues to develop across the blocking unit and in turn leads to the failure of the blocking unit. For the bending-failure type progressive collapse of retaining piles, the failure of the capping beam or actively cutting off the capping beam cannot block the development of the progressive collapse. On the contrary, it may aggravate the progressive collapse.
- excavation,
- cantilever retaining system,
- progressive collapse,
- blocking unit,
- load transfer coefficient

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References (27)

References

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