渗水土路基的英文：
permeable soil subgrade

permeable是什么意思：
a. 有浸透性的,能透过的

This membrane is semi-permeable.
这层膜是半渗透性的。

The waste material is placed in cells with permeable membranes
废液置于有渗透膜的槽中。

The major difference is that geological structures have limited permeability.
主要的问题是地质结构的渗透性有限。

soil是什么意思：
n. 土地，土壤；国土，领土
v.（被）弄脏

He died on British soil.
他死于英国。

The soil is difficult to work with.
这块污迹很难处理。

The fertilization of soil is a subject to the farmers.
肥料的施用对农民来说是一门学问。

subgrade是什么意思：
地基; 路基

Road bed is the subgrade on which are laid the ballast, ties and rails.
路基就是上面铺着道渣，枕轨和钢轨的底基。