Tests reveal that the bottom of the reinforcement cage corresponds to the minimum of the electric potential gradient curve and the inflexion of the electric potential curve.

根据充电法原理，结合模型桩试验，分析了钢筋笼周围的充电电场特征，结果表明钢筋笼的底端对应于电位梯度曲线的极小值点及电位曲线的拐点。