Risk Evaluation of Deep Foundation Pit Construction for Underground Wastewater Treatment Plant Based on Matter-Element Theory

Due to the differences in structural form, compared to traditional above-ground wastewater treatment plants, the risks faced during the construction process of deep foundation pits for underground wastewater treatment plants are more complex and diverse, posing significant challenges for the management of such projects. Therefore, this study proposes a hybrid method based on the Matter-Element Theory and the Risk Breakdown Structure (RBS) to study the risks of deep foundation pit construction for underground wastewater treatment plants. This method first uses the RBS to construct an evaluation index system for the risks of deep foundation pit construction for underground wastewater treatment plants. Then, a combination weighting method based on the Decision-making Trial and Evaluation Laboratory and the Criteria Importance Through Intercriteria Correlation (CRITIC) method is used to determine the comprehensive weights. Subsequently, the Matter-Element Theory is used to calculate the correlation of each evaluation index with different levels of risk in order to determine the evaluation results. Finally, a deep foundation pit construction project for underground wastewater treatment plant in City Y is taken as an example for example analysis. This study can provide a scientific basis for the risk management of deep foundation pit construction for underground wastewater treatment plants.