大比例尺三维地质建模方法研究

当前地下空间大比例尺建模难度较大,少有案例提及。主要难点在于严格按照原始地层开展大比例尺建模,会出现大量的透镜体和螺旋体,给建模工作带来较大难度。6号线地面沉降易发区的试验段研究,共涉及7个站点和6个区间的模型。通过收集整理多方位资料,以横向1:500,纵向1:200比例尺进行大比例建模。选用钻孔537个,剖面299条,格子252个,建模面积为0.6km~2。按照规范对筛选出的钻孔归纳岩性、统一命名,将岩层分为7大类,40层。应用交互拼接建模的方法,将模型分为地质体、地表建筑物两个部分,加入DEM、卫星贴图耦合显示。同时,地层的属性数据也在建模过程中加入到地层属性表中。本次工作解决了透镜体和螺旋体的建模难点,提高了建模精度。

Research on large scale 3D geological modeling method

It is dififcult to model the current underground space at large scale, and few cases are mentioned. The main dififculty lies on the strict carrying out the large scale modeling according to the original strata, so there will be a lot of lens body and spiral. The test section of the easily subsidence area of subway line 6 includes 7 station sites and 6 intervals. By collecting and arranging the multi azimuth data, the model at horizontal scale of 1:200 and longitudinal scale of 1:500 are established. We choose 537 drills, 299 sections, 252 grids, and 0.6km2 areas. According to the rules, we selected some rock cores, and classiifed the lithology, uniformed the rock names; the rocks are divided into seven categories, 40 layers. The model can be divided into two parts, the geological body and the surface structure, by using the method of interactive splicing modeling, which includes the DEM and the satellite maps. At the same time, the attribute data of stratum is added into the formation attribute table in the process of modeling. This work solved the modeling dififculties of the lens body and the spiral body, and improved the accuracy of the modeling.