基于物探电法和数值分析软件的滑坡地质体三维建模

Three-dimensional Landslide Modelling Based on Geophysical Resistivity Method and Numerical Analysis Software

在传统的滑坡稳定性计算及分析过程中,地质体模型通常采用二维剖面形式进行展示,虽然操作较为简单且易于实现,但是无法充分展示地质体几何形态及空间分布。鉴于此,基于物探电法和GOCAD、Sufer、犀牛等专业3D建模软件,提出了一套适用性较强,综合了点、线、面等多元信息的滑坡体三维模型建立方法。首先,利用滑坡平面图,依次通过GOCAD和Sufer插值生成滑坡地表模型,再采用网格高密度电法实测区内不同深度地层的电阻率值,从而获得多个二维电阻率剖面以及滑带模型,然后利用滑坡体上多个钻孔数据确定各处滑带厚度,将各特征面导入到Rhino软件中即可生成滑坡体三维模型。最后以三峡库区万州区塘角滑坡为例,说明了该方法的实际应用过程。结果表明,地球物理实测方法能够获取更丰富的地质信息,结合数值后能快速高效地完成滑坡地质体三维建模,可为后续滑坡稳定性评价工作提供基础。

In traditional process of landslide stability calculation and analysis,the geological model is usually displayed in two-dimensional profile.Although the operation is simple and easy to complete,it is difficult to completely demonstrate the geometry characteristics and spatial distribution of the slope.Hence,based on geophysical resistivity method and professional 3D modelling software,GOCAD,Sufer and Rhino,a three-dimensional landslide modelling method was proposed.The method has strong applicability,and combines the multi-information including point,line and surface.Firstly,the surface model of the landslide was generated by the topographic map,as well as GOCAD and Sufer software.Then the high-density grid resistivity method was adopted to measure resistivity values of different depth strata in the area,which were used to obtain multiple two-dimensional resistivity profiles and the sliding zone model.The borehole data was used to determine the depth of the sliding zone.All the characteristic surfaces were input into Rhino software to generate the three-dimensional model of the landslide.Finally,the Tangjiao landslide in Wanzhou District of the Three Gorges was undertaken as the example to clarify the application process of the proposed method.The results showed that geophysical method can obtain more sufficient geological information.Such information can be combined with numerical software to perform landslide 3D modelling quick and accurately,which can be utilized for subsequent stability evaluation.