It is very difficult to use conventional modeling software directly to build a complex excavation engineering model. According to a hillside landscape design example and based on geometric theory, the paper puts forward a method to compute point coordinate of 3D complex model. Then 3D surface of the model is generated and is used to incise the hillside body to get the excavating model. Finally the model is visualized to obtain full 3D effect of the engineering.
In order to study the shrinkage characteristics of cement paste, environmental scanning electron microscope was used to observe the microstructure shrinkage of cement paste and cement mortar under different humidity. The results showed that : with the relative humidity decreased from 80% to 10%, the shrinkage cracking of paste microstructure appeared in different degree and increased continuously,also the regression analysis showed the relative humidity and shrinkage was conical relationship.
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