四川宜攀高速深达547米的白鹤滩隧道竖井贯通|麻豆免费视频
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中新网成都9月23日电 (记者 刘忠俊)9月23日,四川宜宾市新市镇至攀枝花仁和区高速公路(以下简称“宜攀高速”)全线深达547米的白鹤滩隧道竖井顺利贯通。这是该隧道双幅贯通后,项目攻克复杂地质的又一关键突破。

白鹤滩隧道是宜攀高速的“硬骨头”,作为分离式特长隧道,左线长6644米、右线长6714米,最大埋深863米,最大日涌水量达6.18万立方米。其地处地质极端复杂区域,围岩自稳能力差,施工难度极大。此次贯通的竖井位于隧道主洞左右线间,直径6米、深547米(相当于180层楼高),承担右线送排风与左线排烟功能。施工中,竖井部分段落围岩条件差,涌水、突泥、坍塌风险贯穿全程,技术与安全风险均处行业高位。
为破解难题,项目组组建了技术攻关小组,采用“SMD”短段掘砌机械化工艺,实现打眼、爆破、出渣等全流程机械化作业,并通过中央集控平台实现多设备智能协同,构建“掘、砌、支”一体化模式,效率显著提升。同时,团队优化细节工艺,用两种振捣器确保混凝土密实,以专用料斗与软式溜灰管精准输料避免离析;优化下料口装置,既提升竖井初衬外观质量,也为同类超深井施工提供范本。
针对不良地质段,项目依托高精度监测系统与超前地质预报技术,动态调整施工方案。为解决围岩硬、炮孔利用率低的问题,团队将掏槽孔直径从42毫米扩至65毫米,并优化炸药规格,使爆破循环进尺效率提升近一倍,缩短施工时间。

目前,宜攀高速金宁段路基、桥梁、隧道工程进度及投资均完成90%以上,重点工程稳步推进。其中,金宁段春江枢纽互通至对坪互通段,宁攀段金江枢纽互通至会东北互通、新街互通至宁南互通段已建成。预计2025年底,该高速还将有80公里路段通车。届时,宜攀高速宁攀段将全线通车,宁南县至攀枝花市通行时间将从5小时缩至约2小时。(完)
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