渝昆高铁云南段隧道贯通超九成|精品爆乳一区二区三区无码AV

  中新网曲靖11月25日电 (吴栋良)25日,由中铁十八局承建的大坪隧道贯通。至此,渝昆高铁云南段隧道已贯通48座,隧道贯通已超90%。

图为渝昆高铁大坪隧道建设施工现场。陈畅  摄

  大坪隧道位于云南省曲靖市会泽县境内,全长12.3公里,是全线控制性工程,为Ⅰ级高风险隧道。隧道地处云贵高原喀斯特地貌区,地形起伏大、岩溶发育,隧道穿越2处断层、1处向斜,Ⅳ、Ⅴ级围岩占比近70%,围岩破碎、稳定性极差,开挖时极易出现塌方等险情,而且地下水丰富,最大涌水量每天达3.7万立方米。

  中铁十八局渝昆高铁项目部现场技术负责人宁赋岩介绍,施工中利用瞬变电磁、长距离超前钻孔等多种先进技术手段,2次精准预测出岩溶突水突泥风险,顺利通过了1800多米的极高风险段落,平导连续3个月掘进进度超过200米,为全隧按时贯通奠定了坚实基础。

图为建设者在渝昆高铁大坪隧道内工作。罗扬 摄

  从重庆到昆明,渝昆高铁正在加速建设,随着大坪隧道的贯通,渝昆高铁云南段隧道已贯通48座,隧道贯通已超90%。目前,渝昆高铁云南段全面进入冲刺阶段,每天投入1.4万余名施工人员,1500余台大型机械设备,全力推进重难点项目建设,路基土石方工程已完成99.5%,桥隧施工完成98.6%。

  渝昆高铁全长约700公里,其中云南段长388.6公里,设计时速350公里,是云南省内首条时速达350公里的高速铁路。全线建成通车后,重庆到昆明的行车时间将大幅压缩,对构建新发展格局、促进沿线地区经济社会高质量发展具有重要意义。(完)

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