反坡富水岩溶隧道施工的主要难题是反坡抽排水，而快速有效地排除反坡施工地段的积水，对隧道的施工组织和现场管理影响重大。
Drainage in a reverse slope is the primary problem in the construction of a tunnel in a reverse-slope stratum with abundant water.
本文对于正坡和反坡两种情况，根据上、下层的动量方程和能量方程分析了两层液体的内水跃流动现象，研究并得出了不同流动情况下发生内水跃的条件。
According to momentum equation and energy equation, the flow phenomena of the internal hydraulic jumps were analysesed for stratified flows in a channel with slop down or slop up.
反滤作用：用于河流堤，坝公路铁路，机场路基，挡土墙回填土，边坡等岩土工程，提高稳定性。
Filtrate: it can strengthen in geotechnical engineering such as riverbank dam highroad railway roadbed of airport etc.
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