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井点排水(或降水)是利用井(孔)在基坑、地下洞室周围同时抽水,把地下水位下降到基础底面以下,使施工在无地下水的情况下进行。目前国内较多应用于基础处理,在铁路部门曾用于处理滑坡和路基病害工点。1985年3～7月份,我们在军都山隧道东沟段进行了井点排水的尝试,取得了比较满意的效果。通过本工点的实践,我们认为井点排水的成败,关键在于根据水文地质条件选择合理的井点排水方法。
Well point drainage (or precipitation) is the use of wells (holes) in the pit, underground caverns simultaneously pumping, the groundwater level down to below the basement of the bottom, so that construction without groundwater conditions. At present, the domestic application of more basic treatment, in the railway sector has been used to deal with landslides and roadbed disease work sites. From March to July of 1985, we conducted an attempt to well point drainage in the Donggou section of the Jundushan Tunnel, and achieved satisfactory results. Through the practice of this worksite, we think the success or failure of well point drainage is based on the selection of a reasonable well point drainage method according to the hydrogeological conditions.