Mechanism of overturning progressive collapse of excavations retained by double-row piles induced by over-excavation

ZHENG Gang; YI Fan; HUANG Tian-ming; CHENG Xue-song; YU Dan-yao; LEI Ya-wei; WANG Ruo-zhan

doi:10.11779/CJGE202108001

Volume 43 Issue 8

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Chinese Journal of Geotechnical Engineering > 2021 > 43(8): 1373-1381. > DOI: 10.11779/CJGE202108001

ZHENG Gang, YI Fan, HUANG Tian-ming, CHENG Xue-song, YU Dan-yao, LEI Ya-wei, WANG Ruo-zhan. Mechanism of overturning progressive collapse of excavations retained by double-row piles induced by over-excavation[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(8): 1373-1381. DOI: 10.11779/CJGE202108001

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Mechanism of overturning progressive collapse of excavations retained by double-row piles induced by over-excavation

1.
School of Civil Engineering, Tianjin University, Tianjin 300350, China
2.
Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300350, China
3.
Zhejiang Zhefeng Engineering Consulting Co., Ltd., Hangzhou 310000, China
4.
China Construction Second Engineering Bureau Ltd., Beijing 100160, China

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Received Date: August 03, 2020
Available Online: December 02, 2022

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Abstract

Abstract

Collapse accidents of excavations occur occasionally, including some overturning progressive collapses (OPC) induced by local over-excavation. However, the mechanism and evaluation index of OPC lack studies. Based on a case study on OPC of an excavation retained by double-row piles, the effects of local over-excavation on the internal force, displacement and stability of the cantilever retaining system are investigated, and an evaluation index is proposed, i.e., the anti-overturning status value (ASV), which is the ratio of anti-overturning moment to overturning moment of a pile at a certain moment, to evaluate the status of the pile. The results show that after a local over-excavation, OPC in the zone of over-excavation extends to the adjacent piles owing to the arching effect and capping beam, and ASV of the piles decreases suddenly. The minimum value of ASV during the over-excavation process determines the possibility and the range of OPC. When the retaining system does not include the capping beam, the range of the OPC outside the over-excavation zone will be underestimated. The capping beam cannot decrease the risk of the OPC, because it will enlarge its range, which is different from that in the bending-failure type progressive collapse of cantilever piles. The harmful conditions during the construction process (e.g., overload and disturbance of the vibrating loads) may intensify the level and range of the OPC.
- deep excavation,
- local over-excavation,
- overturning collapse,
- progressive collapse,
- FDM

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References

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