م مقاله کنفرانسی سال ۱۳۸۸ ۴,۱۳۸ مشاهده Alborz Service Tunnel in Iran: TBM Tunnelling in Difficult Ground Conditions and its Solutions Alborz Service Tunnel is the longest tunnel 6 4 km along Tehran Shomal Freeway A service tunnel with dia… TBMkarstwater ingress