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

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