Daraei R, M.A. Herki B, H.Sherwani AF. Study on the Rapid Drawdown and Its Effect on Portal Subsidence of Heybat Sultan Twin Tunnels in Kurdistan-Iraq. Civ Eng J [Internet]. 2017 Jul. 30 [cited 2025 Sep. 11];3(7):496-507. Available from: https://www.civilejournal.org/index.php/cej/article/view/390