文章來源：中(zhong)國鐵路工程總公司 發布時間：2010-06-01
5月20日(ri)，中國鐵(tie)(tie)路(lu)工(gong)(gong)(gong)(gong)程(cheng)總(zong)公司中鐵(tie)(tie)九(jiu)局施(shi)工(gong)(gong)(gong)(gong)的(de)伊(yi)爾(er)施(shi)隧道(dao)全線(xian)貫通(tong)。伊(yi)爾(er)施(shi)隧道(dao)為(wei)單(dan)線(xian)隧道(dao)，單(dan)洞凈(jing)空4.7×6.71米(mi)(mi)（寬×高），隧道(dao)全長1990米(mi)(mi)，是(shi)兩伊(yi)鐵(tie)(tie)路(lu)全線(xian)控制(zhi)性工(gong)(gong)(gong)(gong)程(cheng)，也是(shi)整個兩伊(yi)鐵(tie)(tie)路(lu)工(gong)(gong)(gong)(gong)程(cheng)施(shi)工(gong)(gong)(gong)(gong)中條件最艱苦的(de)區段(duan)，地質條件復雜，圍(wei)巖變化大，分為(wei)Ⅲ、Ⅳ、Ⅴ級圍(wei)巖，支(zhi)護形式(shi)多變，安全系(xi)數較低(di)。中鐵(tie)(tie)九(jiu)局圍(wei)繞工(gong)(gong)(gong)(gong)期、安全和質量目標，積極開展(zhan)技術攻關，在施(shi)工(gong)(gong)(gong)(gong)中不斷總(zong)結經驗，不斷優化施(shi)工(gong)(gong)(gong)(gong)組織，科學排擺，進(jin)出口同時掘進(jin)，發揚連續作戰精(jing)神，按期確保了兩伊(yi)鐵(tie)(tie)路(lu)全線(xian)貫通(tong)。