Abstract: The deep excavation monitoring data directly reflect the force and deformation of the geotechnical materials in the corresponding locations. It is of great engineering value and scientific significance to evaluate the overall stability of the deep excavation by considering the variation of the monitoring data of different types and locations. However, the current relevant research lacks systematic quantitative consideration in this regard. Based on this, an improved entropy-weightedhierarchical analysis fuzzy comprehensive evaluation model is proposed, and reference indices are established to evaluate the safety status of the deep excavation construction. The stability of deep excavation projects is studied by considering the monitoring data of different types and locations objectively and holistically from the perspective of weights. By using the difference coefficient, the weights of indicators calculated by the hierarchical analysis and the entropy weighting method are linearly weighted together to enhance the objectivity of determining the weights of indicators and obtain the comprehensive weight value. Meanwhile, the safety status evaluation table of the deep excavation is established by combining the probability of risk occurrence and the degree of accident damage loss. On this basis, the fuzzy comprehensive evaluation is completed to evaluate the stability of deep excavation. A deep excavation project in Shenzhen is presented in this paper as an example to demonstrate the practicality of the method. The study shows that the evaluation method is more objective in assigning the index weights and more detailed in dividing the safety level evaluation indexes. The method can provide quantitative reference and theoretical support for the stability evaluation of deep foundation pit projects.

Key words: Deep Excavation, Security Assessment, Monitoring Data, Entropy Weight, Analytical Hierarchy Process