洞内真空降水在地铁隧道粉细砂地层疏干残留水中的应用

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地铁区间建设过程中,处理地下水是一大难题。暗挖隧道开挖时遇富水粉细砂地层,采用管井降水或全断面深孔注浆等措施虽可解决大范围的地下水,但在侧壁和仰拱处仍存在残留水。结合地铁暗挖区间开挖过程中洞内真空降水疏干地下水的实际应用,叙述真空降水的工作原理、性能参数、施工技术和优缺点,提出地铁区间粉细砂地层开挖过程中疏干残留水的措施。
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