电渗透系数试验装置研制及其影响因素

Development of a Test Device for Electric Permeability Coefficient and Its Influencing Factors

摘要:

为深入探讨饱和土的电渗透系数及其影响因素，自制了一种简单便捷的电渗透系数试验装置。该装置可以保证在电渗试验过程中试样含水率和孔隙比相对稳定，并排除由于试样两端水头差引起水力渗流的影响。利用该试验装置对5种不同孔隙比的饱和重塑黏性土试样进行电渗试验，结果表明，在低电压和小孔隙比条件下排水量与时间成正比。在此基础上，探讨了电势梯度及孔隙比对电渗透系数的影响规律。试验结果表明，电渗透系数随着电势梯度或孔隙比的增大而增大，且与电势梯度和孔隙比均近似呈线性关系。其中，孔隙比对电渗透系数的影响较大。

关键词:电渗透系数;试验装置;电势梯度;孔隙比;渗流

Abstract:

To investigate the electroosmosis coefficient of saturated soil and its influencing factors， a simple and convenient test device for electroosmosis coefficient was developed， which can ensure that the water content and void ratio of the sample are relatively stable during the electroosmotic test， and the influence of hydraulic seepage caused by the difference of the two ends of the sample is eliminated. An electroosmotic test of saturated remolded clay samples with five different void ratios was conducted by using this device. The results show that the water discharge is proportional to time under the condition of low voltage and small void ratio. On this basis， the influence of potential gradient and void ratio on the electroosmosis coefficient was discussed. The results show that the electroosmosis coefficient increases with the increase of potential gradient or void ratio and is approximately linear with the increase of potential gradient and void ratio， and the void ratio has a great influence on the electroosmosis coefficient.

Key words:electroosmosis coefficient;test apparatus;potential gradient;void ratio;seepage