双连拱隧道浅埋地段初期支护参数优化研究

he double-arch tunnel is characteristic of the huge span, the construction complexity, the design blindness and so on. We made a long-term monitoring to the Shenjintang tunnel of the Hurong national skeleton highway. Based on the monitoring measurement results, this article makes some studies to the initial support parameter of the shallow depth of the K193+260 mileage from three aspects with the aid of ANSYS finite element software. Firstly, it makes a sure analysis to the steps after simplification and gains the dangerous one. Secondly, it makes the optimization analysis to the dangerous one by the zero order and first order method of the optimization design module orderly and gets the optimization parameter of the initial support. Thirdly, it makes the reliability analysis to the optimization result by the probability design module and gets the reliability of the optimization parameter.