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“PBA”洞桩梁法是城市地铁暗挖施工逐渐发展和成熟的一种新兴工法,适用于软弱地层中暗挖车站的施工,在北京地铁10号线第一次全面推广和运用。导洞作为“PBA”洞桩梁法施工的主要临时结构,在粉细砂层中施工难度非常大,以北京地铁10号线劲松站为例介绍粉细砂层中导洞施工技术。
“PBA ” hole pile beam method is a new developing method for the continuous development and maturation of underground subway construction in urban subway. It is suitable for the construction of underground excavation station in soft stratum. It is the first comprehensive promotion and application in Beijing Subway Line 10. As the main temporary structure of “PBA” hole pile beam construction, the pilot tunnel is very difficult to construct in silty sand layer. Taking the Jinsong station of Beijing Metro Line 10 as an example, the construction technology of pilot tunnel in silty sand layer is introduced.