复杂边坡三维地质可视化和数值模型构建

复杂边坡三维地质可视化和数值模型的构建是岩土工程和水利水电工程中常常遇到的关键问题。三维地质可视化可以展示边坡结构面的空间组合,揭示边坡的宏观破坏模式;可视化模型与数值模型的结合和转换可以反映地质信息的仿真性和动态可修改性。基于AutoCAD平台,借助AutoLisp语言,采用滑动最小二乘法插值拟合,构建三维可视化模型,同时讨论可视化模型与数值模型的转入。优点在于结合了AutoCAD优越的图形编辑功能和ITASCA公司数值软件(FLAC3D和3DEC)的计算功能,并可根据地质信息的变化更新可视化模型和数值模型。该技术与三维可变形离散元法相结合,在白鹤滩水电站进水口高边坡三维可视化和应力变形分析中进行了应用。同时针对3DEC软件前后处理的不足,结合3DEC内嵌的FISH语言和AutoCAD的AutoLISP语言进行编程,探讨3DEC加锚方法、三维合位移等值线云图和塑性区可视化实现。

3D GEOLOGICAL VISUALIZATION AND NUMERICAL MODELING OF COMPLICATED SLOPE

The construction of the 3D visualization model and the numerical model of rock slope is critical in geotechnical,hydroelectric and hydropower projects. The 3D visualization model not only illustrates the spatial combination of structural plane in slope,but also discloses the macroscopic failure mode of slope. The combination and transition between the visualization model and the numerical model can indicate the simulation and dynamic modification of geological information. Based on AutoCAD platform,AutoLisp program and interpolation method of MLSM are used to generate the 3D visualization model. Moreover,the interface to the numerical model is discussed. This technique well combines the excellent graphic manipulation of AutoCAD and the general numerical softwares FLAC3D and 3DEC of ITASCA Ltd.. Besides,the model can adapt the technique to change the geological information. Combined with the discrete element method for deformable bodies,the technique has been well applied to the water intake high slope in Baihetan Hydropower Station. FISH program in 3DEC and AutoLISP program in AutoCAD are combined to improve the functions of preprocessing and post processing of 3DEC. The anchorage method in 3DEC,visualization of contour chart and nephogram of 3D displacement and plastic zone are discussed.