Risk assessment of shield tunneling crossing building based on variable weight theory and cloud model

Shield tunneling crossing buildings is a complex process involving multiple influencing factors. The conventional risk assessments for shield tunneling crossing buildings ignore the dynamic changes in index weights and fail to promptly reflect the impact of changes in index status on evaluation results. To solve this problem, a risk assessment model for shield tunneling crossing buildings is proposed based on the variable weight theory and cloud model. Firstly, a risk assessment indicator system for shield tunneling crossing buildings is constructed. The variable weight theory is used to calculate the weights of the evaluation indicators reasonably, taking into account the dynamic changes of the evaluation indicators and their impacts on the evaluation results. The cloud model theory is introduced to solve the randomness and fuzziness in the risk assessment of shield tunneling crossing buildings. The new model is applied to a case study of the risk assessment of shield tunneling crossing buildings during the construction of the Changsha Metro Line 4. Compared with the traditional weight model, the variable weight theory model calculates the weights of the indicators more reasonably. At the same time, it is verified that the model has good applicability and accuracy in the risk assessment of shield tunneling crossing buildings. This model provides a new approach to guide the safe operation management and disposal decision-making of shield tunneling crossing buildings.