高速公路土包沙路基的施工工艺

土包沙路基是指路基的中部用沙填筑，两侧一定宽度和顶面一定厚度用具有一定塑性指数的土包围填筑而成型的路基。处理好土与沙这两种不同性质填料之间的矛盾。对保证路基的强度、整体性、稳定性具有重要作用。简要介绍了工程概况，重点对土包沙路基的施工工艺流程、操作要点及注意事项进行了阐述。

Construction Techniques for the Sand - covered - by - soil Roadbed of the Superhighway

The sand-covered-by-soil roadbed is such kind of roadbed the center section of which is filled with the sand, and the two sides (within certain width) and the top (within certain thickness) of which are covered by the clay soil with certain plasticity index. Treating well the contradiction between the soil and the sand, two fillers with different features, possesses important function on guaranteeing the strength, entirety and stability of the roadbed. This paper briefly introduces the engineering conditions, and emphatically expounds the technical procedures, operation points and notable matters of the construction of the sand-covered-by-soil roadbed.