中文摘要：

现代三维视景建模与仿真技术在高速公路工程选线、施工以及运营管理中具有良好的应用前景。结构物的仿真建模以及能反映施工前后地表形态变化的三维地层模型研究是高速公路信息化中的重要问题。介绍了一种借用ANSYS有限元分析软件提取结构物三维模型表面几何信息的简便方法：结合OpenGL纹理贴图技术，实现了结构物的仿真建模；针对结构物施工后对地表形态改变较大的问题，提出利用结构物表面数据对三维地层模型地表网格进行修剪的方法——地表网格竖直投影修剪法。把上述方法应用到广东省某高速公路高边坡的三维视景仿真建模中，结果表明，边坡的仿真模型较逼真。三维地层模型修剪后的地表形态与真实情况接近，验证了方法的合理性、可靠性。

英文摘要：

Modem 3D scenery modeling and emulation technology has wide application prospects in route selection, construction and operation management of highway engineering. The study of structures emulation modeling and 3D stratum modeling which can reflect the ground surface shape changing before and after construction are important problems in the research of highway informatization. A simple method to extract the geometry information from the surface of structure 3D model with ANSYS is introduced. By combining OpenGL texture mapping technology, the structure emulation model is realized. Because the shape of ground surface will be changed a lot after construction, a clipping method named vertical projection clipping method for surface grids, which makes use of the structure surface data to clip the ground surface grids of 3D stratum model, is put forward. By applying these methods to 3D scenery emulation modeling of a certain high slope in a highway in Guangdong Province of China, it is shown that the emulation model of the slope is lively; and the ground surface shape of the 3D stratum model is very close to the real one after clipping. It proves that these methods are feasible and reasonable.