新建西宁至成都铁路若尔盖隧道贯通|a片试看50分钟做受视频
1. A片试看50分钟做受视频做爱
中新网成都8月8日电 (记者 刘忠俊)8月8日，新建西宁至成都铁路若尔盖隧道顺利贯通，标志着全线隧道施工进入攻坚阶段。
西宁至成都铁路是我国“八纵八横”高铁网兰(西)广通道的重要组成部分，起自青海西宁，经青海、甘肃、四川三省，终至四川成都。其中四川段长约170公里，多数路段海拔3500米左右，从川青铁路黄胜关站引出，途经红原、若尔盖等站进入甘肃。
若尔盖隧道位于四川阿坝州若尔盖县，为单洞双线隧道，全长2176.92米，设计时速200公里。隧道由中铁七局集团承建，地处青藏高原东北边缘，地质条件复杂，属高地应力软岩变形隧道，围岩破碎，洞身下穿3处构造破碎带，地下水丰富，涌泥突水风险高。同时，加上隧道平均海拔3493米，全年平均气温不足5℃，12月至次年1月最低气温达-23℃。高原缺氧导致机械设备能效低、物资运输困难；且隧道穿越若尔盖高原和喀哈尔乔湿地自然保护区，环保要求高，加之地处“无人区”，施工难度极大。
隧道开工以来，施工方采用地质雷达等超前预报围岩情况，通过自动监测调整支护措施，遵循“管超前、严注浆”等施工原则，实现“动态设计、动态施工”，并运用现代化机械设备减少人工劳动强度。成兰铁路有限责任公司西宁至成都铁路指挥部指挥长印建文表示，目前西宁至成都铁路四川段隧道工程已完成66.2%，贯通5座；桥梁工程完成77.5%；路基工程完成58.8%，各项工作正有序推进。
据悉，西宁至成都铁路四川段由蜀道投资集团参与投资建设，全线建成通车后将极大便利沿线群众出行，促进沿线经济社会发展。(完)
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