高密度电法在贵州某高速公路初勘中的应用

Application of Multi-electrode resistivity method in the preliminary survey of an expressway in Guizhou province

贵州某高速公路地处贵州高原西部,场区属溶蚀-侵蚀地貌单元。在该高速公路初勘阶段,为查明场区覆盖层分布、强风化层厚度及基岩岩溶裂隙、断层发育情况等地质信息,本工作将利用高密度电法物探方法进行分析。高密度电法物探方法是以地质体的电性差异为基础,通过观测和研究与这些差异相关的电场或电磁场在空间和时间尺度的分布特点和变化规律,来查明项目区裂隙、构造发育情况。本次工作初步认定裂隙发育区2处、溶蚀发育区3处,并配合钻探为工程设计提供相应的基础地质资料。但限于高密度电法的自身固有的局限性,建议在详勘时用钻探或其他方法做进一步工程验证。

An expressway of Guizhou province is located in the western part of Guizhou plateau and belongs to the dissolution-erosion geomorphic unit.In the preliminary exploration stage of this expressway of Guizhou province,in order to find out the geological information such as the distribution of overburden,the thickness of strongly weathered layer,and the development of karst fissures and faults in bedrock,this work will adopt the multi-electrode resistivity method.Based on the electrical differences of geological bodies,multi-electrode resistivity method was used to find out the fracture and structural development in the project area by observing and studying the distribution characteristics and variation rules of electric fields or electromagnetic fields related to these differences in spatial and temporal scales.This work preliminarily identified two fracture zones and three corrosion zones,providing corresponding basic geological data for engineering design in cooperation with drilling.However,due to the inherent limitations of the method,it is recommended to use drilling or other methods for further verification during detailed exploration.