非饱和粉质黄土拟超固结特性试验研究

Experimental Study on Pseudo Over-consolidation Characteristics of Unsaturated Silty Loess

通过对西安地区粉质黄土进行压缩试验,研究了非饱和扰动黄土的拟超固结特性。试验表明,不同含水量试样的压缩曲线差别很大,含水量较小时压缩曲线中孔隙比随有效应力的增大近似呈线性减小,含水量愈低,前期固结压力愈高,拟超固结比愈高,拟超固结愈明显。含水量较高时,其e-lgp曲线符合灵敏粘土特性,曲线初始阶段平滑。当荷载超过前期固结压力后,曲线呈急剧下降趋势。这些特性对该区工程建设有一定参考价值。

Through compression test on silty loess in Xi＇an area,the pseudo over-consolidation characteristic of unsaturated disturbed loess is studied.It is indicated from test that there is large difference in compression curve of samples with different water content.In case of lower water content,void ratio approximately reduces linearly with the increase of effective stress in compression curve.The lower water content,the higher pre-stage consolidation pressure,the higher pseudo over-consolidation rate,the clearer pseudo over-consolidation.In case of higher water content,e-lg p curve is in accordance with sensitive clay characteristics and smooth in initial stage.When load exceeds pre-stage consolidation pressure,the curve sharply declines.These characteristics furnish a certain reference value for engineering suggestion in this area.