Landslide survey based on three-dimensional resistivity inversion: A case study of the Xuelang Mountain scenic spot, Wuxi, China
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摘要: 有效地查明滑坡区地层结构及滑坡构造对防灾减灾具有重要意义。本文以无锡市雪浪山景区滑坡调查为例, 对比分析了高密度电阻率法二维及三维反演的差异, 探讨了三维反演带状效应的消除方法, 开展了高精度地表高程数据及钻孔先验信息约束下的三维电阻率反演, 构建了滑坡区三维地质模型。研究结果表明, 三维电阻率反演在复杂滑坡调查中具有显著优势; 通过优化网格间距、阻尼系数和反演滤波器参数可以有效抑制带状效应; 精细化地形及先验信息约束可以显著降低地形影响和反演多解性, 提高反演对地层界面和滑坡构造的分辨率。通过三维电阻率反演及地质建模, 获得了滑坡区的三维地层结构和滑坡体、滑动面空间分布, 并对滑坡机理进行了分析研究。该项成果为研究区滑坡地质灾害调查与治理提供了重要基础资料。Abstract: Effectively identifying the stratigraphic and landslide structures in landslide-prone areas is significant for disaster prevention and mitigation. By investigating the landslides in the Xuelang Mountain scenic spot in Wuxi, this study analyzed the differences between two-and three-dimensional inversion using the high-density resistivity method. Accordingly, this study explored methods for eliminating the banded effect in the three-dimensional inversion, performed three-dimensional resistivity inversion under the constraints of high-precision surface elevation data and borehole-derived prior information, and constructed a three-dimensional geological model for the study area. The results indicate that three-dimensional resistivity inversion enjoys distinct advantages in complex landslide surveys. The banded effect can be effectively suppressed by optimizing the grid spacing, damping coefficient, and filter parameters for inversion. Furthermore, the terrain-induced impacts and the multiplicity of solutions of the inversion can be significantly reduced using constraints of refined terrain data and prior information, thus improving the resolutions of stratigraphic boundaries and landslide structures. Through three-dimensional resistivity inversion and geological modeling, this study determined the three-dimensional stratigraphic structure, along with the spatial distributions of the landslide bodies and sliding surfaces, and investigated landslide mechanisms, providing important data for the survey and control of landslides in the study area.
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