water-entering free pressure 进水余压
minimum free water pressure 最小自由水压
pressure free water discharging prevent 无压防排水
Hands-free water reservoir pressure valve 不用动手就能看到水袋的压力
In the course of construction, the free pore water in the weak soil of highway foundation is seldom discharged immediately, and the excess pore water pressure comes into being.
软土高填方路基施工过程中，土内自由水难以及时排出，产生超静水压力。
The program is utilized to calculate soil rocks dam free surface position variation and pore-water pressure distribution condition with time when the up water level position changed.
利用所编写的非稳定渗流计算程序，计算土石坝上游水位变化时自由面位置随时间的变化规律、孔隙水压力的分布情况。
In the planning and design of gravity water transfer system, the combined pattern of pressure free pipe and canal with pressured pipe line is sometimes adopted to carry out water transfer.
在重力输水系统的规划设计中，有时采用无压管渠与压力管道相结合的方式输水。
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