Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (6): 1823-1832.doi: 10.13278/j.cnki.jjuese.20190145

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Stability Evaluation of Deep Foundation Pit of Metro Based on Grey Correlation Analysis with Combined Weights

Lang Qiuling, Wang Wei, Gao Chengliang   

  1. School of Prospecting and Surveying, Changchun Institute of Technology, Changchun, 130021, China
  • Received:2019-07-21 Published:2020-12-11
  • Supported by:
    Supported by Major Science and Technology Projects of Jilin Province (20170204035SF), Key Science and Technology Projects of Jilin Province (20180201033SF) and "13th Five-Year" Research Planning Project of Jilin Provincial Department of Education (JJKH20191243KJ)

Abstract: Because of many risk factors, the stability of deep foundation pit of metro is highly demanded during excavation. Especially in the water-rich gravel stratum and near the existing metro line, it is extremely necessary to make an accurate evaluation of the stability of foundation pit in excavation. The authors took Fengxi station deep foundation pit project of Chengdu Metro Line 17 as the research object, by using the combined weight obtained by using the subjective weight determined by AHP and the objective weight determined by entropy method with the grey correlation method, and objectively evaluated the stability of foundation pit in the excavation through the fuzzy comprehensive evaluation of the monitoring data of the sections around the foundation pit. The evaluation results show that the importance of foundation pit stability to each monitoring project from large to small is horizontal displacement of pile on the top (0.29), ground settlement (0.24), building settlement (0.19) settlement of pile on the top (0.18),and internal support axial force (0.10). The comprehensive evaluation result of the foundation pit stability is very good. The evaluation model can provide reference for the construction of deep foundation pit and risk control in Chengdu area.

Key words: water-rich gravel stratum, excavation of deep foundation pit, combination weights, gray relational analysis, stability evaluation

CLC Number: 

  • TU470
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