高密度电法在菲律宾送电线路调查中的应用

Application of High-Density Electrical Method in Transmission Line Survey in the Philippines

菲律宾ELPI风光一体化项目送电线路穿越原始山地,地形起伏较大,地质条件复杂,开展工程钻探工作难度大。地质调查发现沿线地表灰岩大量出露,岩溶发育强烈,对塔基稳定性造成严重影响。为了查明塔基下方岩溶发育规模、空间分布规律及填充情况等工程地质问题,根据现场地形条件及探测要求,采用高密度电法,在每个塔基部位布置2条测线进行岩溶探测,结果表明该地区岩溶发育,但规模均较小,多为浅层小规模溶腔溶洞,与施工开挖结果基本一致。高密度电法对地下隐伏岩溶空腔探查有效,可为岩溶专项治理施工设计提供地质参考。

The power transmission line of the ELPI wind-solar integration project in the Philippines passes through the primitive mountains where the terrain is undulating and the geological conditions are complex.It is difficult to carry out engineering drilling work.Geological survey found that a large number of surface limestones are exposed along the transmission line,and the karst is well developed,which has a severe impact on the stability of the tower foundation.In order to find out the engineering geological problems such as karst development scale,spatial distribution and filling situation under the tower base,according to the site topographic conditions and detection requirements,the high-density electrical method is adopted,and two survey lines are arranged at each tower foundation for karst detection.The results show that karst is developed in this area,but most are shallow and small-scale karst caves,which are basically consistent with the construction excavation results.The high-density electrical method is effective for the exploration of underground hidden karst cavities,and can provide geological reference for the construction design of special karst treatment.