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社评“非洲14may19_XXXXXL56endian”-译文小记

云南临清高速非洲14may19_XXXXXL56endian公路王家寨隧道左线贯通

来源: 华商报
2024-12-11 03:23:26

最佳回答

“非洲14may19_XXXXXL56endian”云南临清高速非洲14may19_XXXXXL56endian公路王家寨隧道左线贯通

  中新非洲14may19_XXXXXL56endian网临沧12月10日电 (周非洲14may19_XXXXXL56endian全)10日,由中铁隧道局集团有限公司施工的云南临清高速公路关键控制性工程王家寨隧道左线贯通。

图为王家寨隧道左线贯通现场。周全 摄

  临清高速公路是中缅国际陆路大通道的重要组成部分,起于云南省临沧市临翔区,止于中国与缅甸边境的清水河口岸,全长156.482公里,由临沧市政府、临沧市交通局和云南省交通投资建设集团有限公司投资建设。

  王家寨隧道作为临清高速的关键控制性工程,全长8040米,最大埋深1022米,采取双向掘进的施工方式。隧道进口端以第三系强富水半成岩为主,具有胶结差,岩质极软、饱和度高、失水干裂、水稳性差,受扰动极易发生溃砂、流土、突泥涌沙破坏等特点,不良地质长2300多米,占隧道全长的28.7%。

  自施工建设以来,王家寨隧道发生突泥涌水168次,其中规模性突泥涌水27次,累计突涌泥砂量20余万立方米,单次突涌最大泥砂量达到4.08万立方米之高,冒顶11次,安全风险极高,施工难度在中国罕见。

图为建设者在王家寨隧道内施工。周全 摄

  “不但软还吸水,隧道施工好比在海绵里打洞。”中铁隧道局临清高速公路项目经理刘刚对王家寨隧道地质特点作了形象的概括。为破解不良地质施工难题,建设者们集思广益,形成“地表深井降水+洞内综合排水+周边注浆+中管棚+密排小导管+局部注浆补强+四台阶五步交错开挖工法+快速应急响应”的施工方案,采取“降、隔、排、堵”的施工方法。此外,在中国高速公路隧道首次使用了泥水平衡顶管施工,创新运用超前锁扣管幕、动水抗分散新材料高压注浆等一系列关键技术,有效实现围岩“固液分离”。

  临清高速公路全线建成通车后,将实现与墨临高速、昆曼国际大通道相接,架起一条中缅经济高速走廊,对云南加快推进面向南亚东南亚辐射中心建设具有重要意义。(完)

非洲14may19_XXXXXL56endian

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