非饱和土电渗加固的试验研究

电渗法是一种重要的处理软土的方法。电渗固结理论假设土是完全饱和的,而实际工程中处理的土多为非饱和土,电渗加固效果仍尚待研究。为此,采用自制的一维加固电渗仪,进行不同饱和度黏土的电渗对比试验,通过比较试验中电流、排水量、沉降、含水率、最终强度等指标的变化情况,研究非饱和土的电渗加固效果。结果表明,从电渗结束后土体强度增长幅度上看,含水率越低的土样强度增长幅度越小。与饱和土相比,电渗对非饱和土有一定的加固效果,但是加固效果不及饱和土。

Electro-osmosis tests of unsaturated clays

Electro-osmosis is an important method of processing soft clays. Theory of electro-osmosis consolidation assumed clays were saturated, but most of the clays processed in practical engineering were unsaturated, the reinforcement of unsaturated clays by electro-osmosis still needs to be studied. The electro-osmosis contrast tests of clays in different saturation states were conducted by using the self-made electro-osmosis instrument, and the reinforcement effect of unsaturated clays was studied by comparing the changes of current, displacement, settlement, moisture content and ultimate strength. Considering the increasing range of strength, the range weakened as the decrease of the moisture content. The results showed that comparing to the saturated clays, the reinforcement of unsaturated clays by electro-osmosis is effective, but is inferior to that of saturated clays.