An extended TODIM-based model for evaluating risks of excavation system

This paper presents a risk evaluation model of excavation system. The model is developed based on extended TODIM method (TODIM is an acronym in Portuguese for Interactive Multi-criteria Decision Making). Developed model consists of three phases: data collection and benchmark risk level classification, extended TODIM method application and risk status perception. Excavation system is divided into 19 sub-systems based on monitored scheme, and twelve influential factors are determined. Sub-systems of excavation in high risk status are identified via the developed model. Impacts of coefficient theta in extended TODIM method on risk status results are investigated. An excavation construction project in Tianjin is adopted. Evaluation results show that sub-systems with high-risk status can be identified, which are consistent with the engineering practices. Finally, sensitivity analysis is conducted to increase the robustness of developed model. The developed model can provide a comprehensive risk status perception of sub-systems of excavation which can mitigate and manage the risks during excavation construction.

Automated summary

This paper introduces a risk evaluation model of excavation system based on the extended TODIM method. The model consists of three phases for risk assessment and has been applied in an excavation construction project in Tianjin. Results show that high-risk sub-systems can be identified, consistent with engineering practices, and sensitivity analysis has been conducted to increase the model's robustness.