高密度电阻率法在冻土层下松散层厚度探测中的应用

Application of High Density Resistivity Method in Detecting the Thickness of Loose Layer under Permafrost

高密度电阻率法在冬季地表存在冻土层时由于接地条件较差,往往取得不了较好的探测效果,本文以采用长钢钎钻透冻土层并灌以冻点较低的饱和盐水等手段,改变接地条件,将其应用在冬季北方局部第四系松散层厚度的探查中,取得的成果断面特征符合地层电性变化规律,推断解释的松散层厚度与钻孔揭露厚度吻合,验证了该方法在工程探查方面的应用价值。

The high density resistivity method often fails to achieve good detection effect in winter when there is frozen soil on the surface due to poor grounding conditions.In this paper,drilling through the frozen soil with long steel and filling it with saturated salt water with low freezing point will change the grounding conditions,and it is applied in the exploration of the thickness of local quaternary loose layer in the north in winter.The section characteristics of the obtained results are in accordance with the law of formation electrical variation,and the inferred interpreted thickness of the loose layer is consistent with the exposed thickness of the borehole,which verifies the application value of the method in engineering exploration.