西安张家铺地区黄土土-水特征研究

Experimental study of soil-water characteristic curves of loess in Xi’an Zhangjiapu area

利用非饱和土压缩仪对西安张家铺地区原状非饱和黄土进行土—水特征曲线试验研究。在试验中充分考虑到天然干密度和竖向应力对土—水特征曲线的影响。根据试验资料揭示出:在较低的含水量条件下,土—水特征曲线走势比较平缓,而在较高的含水量条件下,土—水特征曲线走势比较陡峭;较小的竖向应力对土—水特征曲线影响较小,而较大的竖向应力对土—水特征曲线影响较大;通过大量试验结果拟合出了考虑天然干密度和含水量影响的原状非饱和黄土土—水特征曲线,用计算值与实测值进行对比,发现拟合效果较好,拟合的土—水特征曲线对实际工程有较好的参考意义。

Experimental study on soil-water characteristic curves of Xi’an intact unsaturated loess by using unsaturated soil consolidation apparatus.The test considered the effect of natural dry density and vertical stresses.Under the lower water content condition,the soil-water characteristic curves goes easier,in contrast,under the higher water content condition,the soil-water characteristic curves goes harder.The change of soil-water characteristic curves is less in small vertical stresses,and is more in higher vertical stresses.After the experiment,the function of fitted soil-water characteristic curves have been established which took the effect of natural dry density and water content into accout.The test and calculated data verify the reliability of the formula.The function of fitted soil-water characteristic curves has very important meaningful for actual project.