一维电渗固结过程中土体性质变化规律研究

Study on the change law of soil properties during one-dimensional electroosmosis consolidation

为了进一步探究电渗固结过程中土体性质以及电渗参数的变化规律,开展了室内模型试验研究,在自制的电渗试验模型箱中开展了一维电渗固结试验研究,试验通电时长102.5 h,测定了排水量、电流值,并通过金属探针测定了阴极-阳极之间的6个点处的电势变化。试验研究结果表明,电渗排水法具有较快排水速率,电渗初期排水量以及电流变化速率快,后续逐渐趋于平缓。电渗过程中电势分布是持续变化的,一维模型中电势分布总体呈现出线性分布的规律,但是其幅值会出现波动。电渗过程中电极界面处接触程度的变化,会导致有效电势的降低,造成电渗排水后期效率低下的问题。在理论研究及工程应用中,应当考虑到这些因素的变化,从而获得更好的电渗排水加固效果。

In order to further explore the change law of soil properties and electro-osmosis parameters in the process of electro-osmosis consolidation.The indoor model test research was carried out,and the one-dimensional electro-osmosis consolidation test research was carried out in the self-made electro-osmosis test model box.The test was powered on for 102.5 hours,the displacement and current values were measured,and the potential changes at 6 points between cathode and anode were measured by metal probe.The experimental results show that the electro-osmosis drainage method has a faster drainage rate,the initial displacement and current change rate of electro-osmosis is fast,and then gradually tends to be flat.In the process of electro-osmosis,the potential distribution is constantly changing.In the one-dimensional model,the potential distribution generally presents the law of linear distribution,but its amplitude will fluctuate.The change of contact degree at the electrode interface in the process of electro-osmosis will lead to the reduction of effective potential and the problem of low efficiency in the later stage of electro-osmosis drainage.In theoretical research and engineering application,the changes of these factors should be taken into account,so as to obtain a better effect of electro-osmosis drainage reinforcement.