Study on Influence Factors of Crossing Railway Tunnel Excavation

In order to discuss the excavation influencing rule of crossing railway tunnel, 3 major influence factors including rock grade, cross angle and rock pillar height were taken into account, and 100 numerical models were designed for calculating, and then, the vault settlement and primary supporting internal force of existing tunnel induced by new tunnel excavation were analyzed. The study results show that: with the excavation processing of new tunnel, the vault settlement and primary supporting internal force of existing tunnel getting large; with the rock pillar height, cross angle and rock grade increasing, the increasing ratio of vault settlement of existing tunnel increases, but the increasing ratio of primary supporting internal force decreases, and with the cross angle increasing, the increasing ratio of primary supporting internal force increases.