Assessment of water inrush risk during tunnel construction based on surrounding rock monitoring
The frequent occurrence of water inrush disasters poses a significant threat to tunnel construction safety,as well as human lives and properties.Therefore,it is crucial to accurately predict and effectively control the water inrush risk during tunnel construction.This study aims to propose a tunnel construction period-specific method for predicting water inrush risk,determining the probability of risk,and indicating the range of water quantity by incorporating construction site monitoring data.First,comprehensive consid-eration is given to the geological structure,and hydrogeological conditions based on analyzing water burst accident cases during construction.Information regarding excavation and support,dynamic monitoring of surrounding rock,and osmotic pressure is incorporated to establish an evaluation index system for water in-rush consisting of 10 indicators.Then,the game theory method is employed to optimize the combination weighting.Additionally,an improved efficiency coefficient model is constructed for calculating the compre-hensive efficiency coefficient at each risk level,followed by determining the normalized probability of risk occurrence.Finally,based on the principle of maximum membership degree,the risk level and the water inrush scope are determined.Taking Jigongling Tunnel and Yuelongmen Tunnel as cases,this approach forecasts the risk during construction.The results show that the proposed method,which integrates the game theory,combined weight,and an improved efficiency coefficient,aligns well with the actual excava-tion outcomes at the site.It comprehensively considers the non-linear relationship between evaluation indi-ces and risk grades,resulting in a prediction outcome that closely reflects the actual construction condi-tions.Furthermore,it enables the estimation of both risk probability and water inrush range while evalua-ting risk grades,thereby offering a novel approach for accurately assessing water inrush risks during tunnel construction.
risk assessmentwater inrushtunnel construction periodsurrounding rock monitoringim-proved efficiency coefficient
万方数据
维普
