The structural design of the roadbed should be designed according to the use of requirement and the local natural conditions,as well as combine the construction condition. Before design, Fully data such as geology along the line, hydrology, terrain, meteorology and so on should be collected . Pay special attention to the influence of the topographical and geological conditions, and have the choice of appropriate form of embankment sections,grade of side slope and disease measures of prevention and control .
Soft soil subgrade has the character of big subsidence and long time of continuity under the influence of the outer load. To build the high grade highway in the soft soil foundation , the potential settlement after the construction of transportation will cause a great harm. therefore, Effective and reasonable reinforcement measures should be taken on the weak foundationspin. Soft soil foundation dealed with many ways has its advantages and disadvantages and limitations, how to select the way of the reasonable foundation treatment is directly related to project quality, progress of the project and project investment.
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