Simulation Analysis Method for Evolution Process of Water and Mud Inrush in Underground Tunnels
Evaluating the damage risk level of water and mud inrush during the construction under water-rich,high-pressure,and unfavorable geological conditions is a challenge for the construction design of underground tunnels.Analyzing the interactions between excavation stress and seepage is crucial for accurately simulating the evolution of water and mud inrush during tunnel construction.We propose a method to calculate the damage coefficient of sur-rounding rock corresponding to the damage characteristics in different deformation stages based on its damage evolu-tion during excavation load release,and further examines how this damage affects the rock's permeability coeffi-cient.Furthermore,we introduce a calculation method for determining the critical water inrush coefficient of sur-rounding rock based on its failure characteristics and water inrush mechanisms.According to the damage and per-meability of surrounding rock,we categorize the water and mud inrush damage into four risk levels,providing the basis for assessing the risk of such damage in underground tunnel construction.Finally,we present a coupling cal-culation method that integrates variable damage stiffness,weighted grading of excavation load,and iterative applica-tion of seepage load.This method simulates the evolution of water and mud inrush during tunnel excavation.Appli-cation of this method in engineering practice demonstrates its effectiveness,offering a viable approach for assessing water and mud inrush risks in underground tunnel projects.
water and mud inrushunderground tunnelsconstruction excavationnumerical simulationcoupled iteration
万方数据
维普
