Optimization Study of Waterproof and Drainage Technology Parameters for Deep-buried Ditches in Railway Tunnels
Water-rich tunnels often face structural safety issues during operation due to drainage system blockages,making the optimization of waterproof and drainage technology parameters crucial.Based on the Xigu Tunnel Project of the Shenbai High-Speed Railway,this study constructs a mathematical theoretical model of seepage for deep-buried ditches with external drainage methods.The image method is applied to calculate the water inflow and the water pressure behind the tunnel lining.The accuracy of the calculations is verified using a numerical simulation model,and the characteristic parameters of the deep-buried ditch drainage system are analyzed to propose corre-sponding drainage technology recommendations.The results show that the ditch diameter significantly impacts water inflow and lining water pressure compared to burial depth.The influence range of water pressure behind the lining is within 5 meters on either side of the invert center.There is a critical value for the grout ring's permeability coeffi-cient affecting seepage in surrounding rock;when the permeability ratio is less than 50,a higher permeability ratio leads to less water inflow and greater water pressure behind the lining,impacting the entire ring.Under a 100-meter water head,the optimized parameters for the deep-buried ditch drainage system are:burial depth of 0.2 to 0.5 meters,radius of 0.3 to 0.5 meters,and a grout ring permeability ratio of 10 to 30.
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