Abstract：Research purposes: With 3D system for the road engineering design, choosing the appropriate subgrade engineering design mode is essential to framing the subgrade design model and its development and application. By studying variable design modes for road subgrade engineering with 3D software system, this paper proposes the appropriate subgrade designmode and the corresponding overall solution to the system development.
Research conclusions:In 3D software system for the road engineering design, the designmode for road subgrade can be divided into threemodes theoretically, namely pure -3D designmode, quasi-3D designmode and pseudo-3D design mode. Through a comprehensive analysis of the production requirements, subgrade engineering characteristics, change of design concep,t usage of resource and synthetic investmen,t it shows using quasi -3D design mode to develop subgrade engineering design software is appropriate, and under certain conditions, using quasi-3D designmode along with pseudo-3D designmode step by step is also feasible.
2009, Vol. 26 
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