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Abstract Through analysis of geometrical characteristics，engineering rock-mass is divided into three basic types，continuous non-folded rock-mass，non-continuous non-folded rock-mass and folded rock-mass. An appropriate spatial data model for 3D modeling of non-continuous non-folded rock-mass is proposed，and its corresponding data structure is constructed. A surface modeling technique is developed for building this kind of rock-mass. By using the OpenGL technique，a visual modeling system is developed and used to construct the 3D visual model of rock-mass for a given geotechnical engineering.
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Received: 03 January 2003
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