基于放样和切割的FLAC^(3D)复杂滑坡建模

FLAC^(3D) modeling for complex landslide based on lofting and cutting

FLAC^(3D)前处理模块对复杂地质体建模具有一定的难度,因而提出应用AutoCAD放样功能和AutoCAD Civil3D,ANSYS切割功能为建模主体,辅以其他软件的复杂滑坡模型建立的方法.该方法在野外收集的地质资料的基础上,通过Surfer软件对离散地质界面数据进行插值并形成规整地质界面信息(数字高程模型,DEM),在AutoCAD中利用插值的坐标信息通过AutoCAD二次开发程序VBA绘制样条曲线,并利用样条曲线进行放样得到代表地质界面的曲面,再利用AutoCAD Civil3D的三维建模功能通过面切割体的方法将体切割形成地表面,最后通过ANSYS面切割体方法实现其他滑坡体单元和复杂接触面的建立,从而完成复杂地质界面的嵌合和尖灭的处理,实现了复杂滑坡模型的建立.通过胡蓉国道主干线的刘家嘴滑坡模型的建立及分析证明了该方法的可行性和实用性.

The deficiency of pre-processing module of FLAC^3D brings about some difficulties to build complex geologic bodies, a method was put forward that by using AutoCAD（ Civil3D）, ANSYS and other software. By this way, some geologic data were collected from in - situ and interpolated by Surfer, and then structured geological interface data （Digital elevation model, DEM） was iormed. Some spline curves were drawn by AutoCAD secondary development procedure VBA with point coordinates, and surfaces which represent geological interface were lofted by spline curves. Body was cut by surfaces with three - dimensional modeling function of AutoCAD Civil3D, then ground surface was completed, and other landslide bodies, complex interfaces were built by cutting with ANSYS. Thus, the chimeric and pinchout of complicated geological were accomplished, a complex landslide model was achieved. At last, the feasibility and practicality was testified by the model of LiuJiazui landslide located at Hu Rong national highway main trunk.