On the way to adjust compaction humidity of soil;

Based on the practice of building the road in the sand area of national road 210, this paper introduced the feature of aeolian accumulation sand and the construction craft of waterish impaction style.

The Cold-vapor Atomic Absorption method was adopted to analyze two standard samples with different concentration under different humidity level in laboratory.

In consideration of the simplicity of hydrogeology conditions of the red bed and lower moisture compressive strength of the rock bed and easiness in shaping in excavation, the feasibility of construction of high arch dam for Xiangxikou hydroproject in Guizhou province has been studied and the factors which should be considered in dam design are discussed.

By actual examples,the article introduces a new technology in situ measurement of the roadbed compaction density--the additional mass method,and introduces in detail its theory,method and technology,instruments and equipment and its testing results.