新建西宁至成都铁路红原2号隧道1号斜井与进口段贯通|日b就日小嫩b
中新网成都7月28日电 (记者 刘忠俊)7月28日,经过825天施工,新建西宁至成都铁路红原2号隧道1号斜井与进口段成功贯通,这是该隧道首个贯通工点,标志着施工进入全面冲刺阶段。

西宁至成都铁路是“八纵八横”高铁网兰(西)广通道组成部分,起自西宁站,终至成都东站,四川段长约170公里,多位于海拔3500米左右的高原区域。
红原2号隧道全长5535.77米,位于四川松潘县,海拔超3700米,是全线“咽喉”工程。隧道最大埋深约314米,地质构造复杂,地应力高度集中,V级围岩占比高达98%,存在显著的软岩大变形风险。山高坡陡、沟谷纵横,地质预报显示贯通段围岩破碎、节理裂隙发育,地下水活动频繁,施工安全风险极高。隧道季节性冻土和多年冻土影响工程稳定性,高海拔通风效率低,高原路况复杂,物资运输保障压力大,施工难度极大。
为增加作业面,红原2号隧道掘进采用“进口+2座斜井+出口”方案,1号斜井长527米。“采用全环加强型工字钢支护、管棚注浆等强化支护,以‘短台阶法’掘进,加密监测,应用先进地质预报手段,降低交叉作业风险。”中铁十九局西成铁路指挥部指挥长袁德明称,此次贯通为全隧贯通奠定了基础。
据了解,红原2号隧道掘进过程中,参建人员克服高原反应、恶劣气候等困难,全力推进工程建设。(完)
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