To solve the problem of subjectivity influence in risk assessment of deep excavation project and zoning refinement and tracking of site risk, this paper proposes a construction risk dynamic assessment method for sub-zones of deep excavation by combining criteria importance through intercriteria correlation (CRITIC) and technique for order preference by similarity to an ideal solution (TOPSIS) based on the actual monitoring data. Firstly, we divide sub-zones of deep excavation according to the layout of monitoring points, select the deformation of surrounding environment, deformation of deep excavation, change of underground water level, etc., as assessment indicators, then adopt CRITIC to determine weights of indicators, use TOPSIS and fuzzy theory to dynamically assess the construction risk of each sub-zone based on the actual monitoring data, and finally verify the proposed method through the case study of a deep excavation project in Shanghai. The results show that: (i) The indicators that play a dominant role in the construction risk assessment of deep excavation in this case study are cumulative surface settlement, change rate of surface settlement, cumulative underground water level, change rate of underground water level and change rate of horizontal deformation on the top of the diaphragm wall; (ii) As the excavation progresses, the weights of cumulative indicators generally increase, while the weight of change rate indicators generally decrease; (iii) In terms of spatial distribution, the risk of each sub-zone of the deep excavation is long side area risk > short side area risk > corner area risk; (iv) in terms of time evolution, the risk level of each sub-zone of the deep excavation does not change much, indicating the deep excavation itself and surrounding environment are in a relatively stable state during the excavation process. The risk assessment result is in high conformity with reality, which indicates that the CRITIC-TOPSIS-based method can effectively avoid the subjectivity of experts and can be used for risk assessment of deep excavation project during the whole construction process.
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