Unique soil conditioning techniques were developed during the Sound Transit University Link Light Rail U220 tunnel project in Seattle, WA. The project consists of twin bore, 21.5 foot diameter EPB TBM tunnels extending 11,400 feet under urban environments and through varying soil formations including gravels, sands, silts and clays. Earth pressures ranged from 2.2 bar to 6.1 bar. This paper outlines the development of the automatic soil conditioning system used on the TBMs through the clay formations.
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机译：在Sound Transit大学Light Right U220隧道项目中开发了独特的土壤调节技术，在西雅图，WA。该项目由双孔组成，21.5英尺直径的EPB TBM隧道在城市环境下延伸11,400英尺，并通过不同的土壤形成，包括砾石，沙子，淤泥和粘土。地球压力范围从2.2巴到6.1巴。本文概述了通过粘土形成在TBMS上使用的自动土壤调理系统的开发。
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