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湖北日报讯 (记者雷闯、通讯员张启山、实习生刘昕)昨日贯通的武汉地铁8号线长江隧道,由铁四院设计,这是武汉地铁首次采用单洞双线模式,可以抵抗6级地震,使用寿命100年。
武汉地铁8号线过江隧道链接武昌徐家棚车站与汉口黄浦路站,全长3186米,开挖直径12.5米,相当于四层楼高,是目前国内最大直径的地铁隧道。记者看到,与地铁2号线、4号线单洞单线的过江隧道不同,8号线采用的是单洞双线模式,即往返于武昌、汉口的地铁过江时,都在同一个隧道内行驶。“此处江面较宽,单洞双线只需一台盾构机,一次性将双侧地铁列车隧道打通,减少一条隧道的挖掘,可降低风险。”铁四院武汉地铁8号线长江隧道设计负责人吕延豪解释,8号线地铁远期最小发车间隔时间为2分钟,采用单洞双线,可充分利用隧道内空间,设置专用风道满足通风要求,保证行车密度。
同时,采取该通车模式无需在地面建筑风井,避免了地面拆迁,可最大限度保护所经地区的文物和老建筑。
据悉,为进一步提高过江安全性,该隧道在国内首次采用了双层衬砌(预制管片+现浇混凝土)盾构,在原有隧道内壁贴管片的基础上,再加一层30厘米厚的钢混内衬,可以抵抗6级地震。
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