The subgrade can be divided into the natural subgrade and artificial subgrade, generally adopts the natural subgrade in the engineering of bridge building.
地基可以分为天然地基与人工地基，在桥梁工程中一般采用天然地基。
Highway subgrade is soil body structure including natural earth foundation and artificial fill embankment.
公路路基是土体构筑物，含天然土地基和人工填土路堤两大部分。
An introduction is given to natural conditions of subgrade work, main principles for subgrade design, green protection of side slope, and design optimization.
介绍胶新铁路路基工程的自然概况，设计的主要原则，边坡绿色防护和优化概况。
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