综合物探方法在航道水闸基础定位研究中的应用

Application of comprehensive geophysical prospecting method in the research on the location of residual sluice foundation at the bottom of the channel

水下闸基础为钢筋混凝土,具有特殊的工程结构,与航道内地层、淤泥、水体等环境具有明显的物性差异,本次利用GEM-2多频电磁法清晰准确地探测到了残留水闸的平面边界,利用高密度电阻率法、孔中磁梯度法较为有效地划定了残留水闸的垂向位置及厚度,同时结合水下地形扫描,精细地刻画了残留水闸的三维空间属性。

The remaining sluice foundation at the bottom of the channel will affect the normal operation of navigation.To accurately determine the spatial position of the remaining sluice foundation and ensure the safe running of ships,several common engineering geophysical exploration methods such as Gem-2 multi-frequency electromagnetic method,Underwater topographic scanning method,high-density electrical method,and magnetic gradient method are adopted which to compare the effectiveness,and summarize the technical points,and to accumulate technical data and engineering experience for the positioning research of typical obstacles in the channel.The sluice foundation is reinforced concrete,with a special engineering structure which has obvious physical properties different from the stratum,water,and mud.The results show that the plane boundary of the remaining sluice foundation is clearly detected by the Gem-2 multi-frequency electromagnetic method;and the vertical position and thickness are delineated effectively by high density electrical method and magnetic gradient method;and at the same time,combined with the result of underwater topographic scanning,the three-dimensional spatial attributes of the residual sluice were carefully described.