In recent years. the invert anomalies of operating railway tunnels in water-rich areas occur frequently. which greatly affect the transportation capacity of the railway lines. Tunnel drainage system is a crucial factor to ensure the invert stability by regulating the external water pressure (EWP). https://safeersappliancers.shop/product-category/neff-n30-u1chc0an0b-electric-double-oven-stainless-steel/