类似下水管道，铁路线的坡度平缓，经常从地下穿过或从高空越过高速公路、溪流、险山和其他障碍物。
The grades are gentle and, like drainages, the routes often go under or over barriers such as highways, creeks, steep hills or other obstructions.
以地下水动力学为基本原理，建立了以渗透破坏的临界水力坡度为条件的预防溃砂发生的临界条件和预计公式。
On the basis of groundwater dynamics, with the condition of critical hydraulic of the seepage failure, deducted critical condition and the estimating formula of preventing inrush of sand.
数值计算验算了降雨的方式，斜坡地层的形状以及坡度的变化对地下水位进展和衰退过程的影响。
In numerical calculations, the effects of rainfall pattern, shape of slope layer and changing slope to the development and decline of subsurface flow were examined.
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