Norway's US$590M Sandvika -Asker rail project, south of Oslo, is being built by the client, The Jernbaneverket Utbygging (Railroad Department), to double the rail capacity between Oslo and Drammen. Lot JA2, Jong-Asker is a 2.7km long double-track rail tunnel that was recently constructed by AF Spesialprosjekt with its subsidiary company Scandinavian Rock Group (SRG) for a contract price of US$66.5M (figure 1). Drill and blast using an AMV jumbo started in June 2002 and the 104m~2 cross-section tunnel was completed in 18 months. Throughout its length the geology is hard rock (limestone), with an overburden between 2m-50m. This paper describes the importance of water control during tunnel construction and uses the Jong-Asker Tunnel as a case study.
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机译：挪威耗资5.9亿美元的位于奥斯陆以南的山特维卡-阿斯克铁路项目由客户Jernbaneverket Utbygging（铁路部门）负责建设，以使奥斯陆与德拉门之间的铁路运输能力翻一番。 Jong-Asker的JA2地段是一条2.7公里长的双线铁路隧道，最近由AF Spesialprosjekt与其子公司Scandinavian Rock Group（SRG）共同建造，合同价格为6,650万美元（图1）。 2002年6月开始使用AMV超大型钻机进行爆破，并在18个月内完成了104m〜2断面隧道的施工。在整个长度上，地质是硬岩（石灰岩），覆盖层在2m至50m之间。本文介绍了在隧道施工过程中水控制的重要性，并以Jong-Asker隧道为例进行了研究。
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