Extension Evaluation on Excavation Safety of Deep Foundation Pit in Sandy Cobble Stratum Based on Entropy Method

WANG Wei; LIU Danna; PENG Di

doi:10.3969/j.issn.0258-2724.20200333

Volume 56 Issue 4

Jul. 2021

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Journal of Southwest Jiaotong University > 2021 > 56(4): 785-791, 838.

WANG Wei, LIU Danna, PENG Di. Extension Evaluation on Excavation Safety of Deep Foundation Pit in Sandy Cobble Stratum Based on Entropy Method[J]. Journal of Southwest Jiaotong University, 2021, 56(4): 785-791, 838. doi: 10.3969/j.issn.0258-2724.20200333

Citation:

WANG Wei, LIU Danna, PENG Di. Extension Evaluation on Excavation Safety of Deep Foundation Pit in Sandy Cobble Stratum Based on Entropy Method[J]. Journal of Southwest Jiaotong University, 2021, 56(4): 785-791, 838. doi: 10.3969/j.issn.0258-2724.20200333

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Extension Evaluation on Excavation Safety of Deep Foundation Pit in Sandy Cobble Stratum Based on Entropy Method

doi: 10.3969/j.issn.0258-2724.20200333

Received Date: 02 Jun 2020
Rev Recd Date: 18 Jul 2020

Available Online: 24 Aug 2020

Publish Date: 15 Aug 2021

Abstract

Abstract

In order to objectively evaluate the safety and stability of deep foundation pit excavation in watery sandy pebble stratum, eight evaluation indexes, such as ground settlement, building settlement and groundwater level, are selected to evaluate the excavation safety according to the structural deformation, stress, groundwater and surrounding environment. A deep foundation pit project of a metro station in Chengdu is used as an example, and according to the measured data within the four months of foundation pit excavation, the entropy method is employed to assign the selected evaluation indexes. Based on the correlation function between the matterelement theory and extension set, the extension evaluation model of excavation safety for the deep foundation pitis established. Comparing the evaluation results with those of fuzzy comprehensive evaluation, it is concludedthat the axial force of concrete support, pile top settlement and the horizontal displacement of support structure are the most important three indexes in the entropy weight calculation of this case, which have the greatest impact on the safety evaluation. For the safety evaluation of ground settlement and pipeline settlement, the extension evaluation result is one grade higher than the fuzzy comprehensive evaluation result, which is consistent with actual monitoring data and is conducive to the prevention and control of potential risks in the construction process. The extension evaluation model based on entropy weight can accurately improve the safety of the foundation pit excavation through single factor analysis and comprehensive analysis, and the extension evaluation model can be applied in the safety evaluation of foundation pits in watery sandy cobble strata in Chengdu.
- sand cobblestratum,
- entropy method,
- deep foundation pit of metro,
- excavation stability,
- extension evaluation

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Extension Evaluation on Excavation Safety of Deep Foundation Pit in Sandy Cobble Stratum Based on Entropy Method

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