基于无接触电阻率法的疏浚淤泥固化土的早期固化机理研究

Research on the Early Curing Mechanism of Solidified Dredging Silt Based on the Non-contacting Resistivity Measurement

采用无接触电阻率测定仪测定淤泥固化土的72 h内的电阻率ρ随时间t变化的特征曲线ρ(t)-t,分析淤泥固化土电阻率的变化特点;并从淤泥固化土中微观反应的角度进行了分析,试图从电阻率的角度阐释淤泥固化土早期的固化机理。试验结果表明,无接触电阻率法可以用来反映淤泥固化土早期的内部微观反应,根据电阻率曲线的特征点将淤泥固化土内部的化学反应过程划分为Ⅰ溶解期、Ⅱ诱导期、Ⅲ硬化期三个反应阶段。不同有机质含量的淤泥固化土的电阻率曲线形式类似,只是对特征点的位置有影响,验证了溶解期阻碍淤泥固化土电阻率下降的原因。

The electrical resistivities ρ（t） within 72 hours of solidified soil composing of dredged clays are measured in a non-contacting electrical resistivity measurement device. And the changing characteristics of the resistivity of solidified soil is analyzed from the angle of the micro reactions in solidified silt soil,trying to interpreted the early curing mechanism of solidified soil from the perspective of resistivity. Test results show that the non-contacting resistivity method can be used to reflect the early internal microscopic reaction in solidified soil,and according to the feature points of the resistivity curve of the solidified soil,the solidified soil internal chemical reaction process can be divided into three stages：Ⅰdissolving period,Ⅱsetting period,Ⅲ initial hardening period. The resistivity curve of solidified soil different organic matter content is similar,but the contents have an impact on the location of the feature points. And the obstacle hindering the resistivity from decreasing in dissolving period is revealed.