掺土粉煤灰的动强度及孔压发展规律

Experimental study on dynamic intensity and pore water pressure development of fly ash mixed with loess

摘要: 在动扭剪三轴仪上对不同黄土掺量的粉煤灰试样进行动力学试验,根据试验结果对掺土粉煤灰的动强度及孔压发展规律进行了分析。试验表明:随着掺土量的增加,掺土粉煤灰的动强度值有所下降,在同一固结比条件下,掺土量越大,产生破坏所需的动剪应力和破坏振次就越小;掺土粉煤灰的动强度指标中粘聚力随掺土量的增大而提高,而内摩擦角随掺土量的增加呈略微减小的趋势;随着掺土量的增加,孔隙水压力随振次比及轴向变形的增长速度逐渐变缓,在纯粉煤灰中掺入一定量的黄土,有助于提高粉煤灰的抗液化性能。

Abstract: According to the dynamic tests on fly ash samples mixed with different amounts of loess by the dynamic torsional shear instrument,the dynamic intensity and development of pore water pressure had been analyzed.Firstly,the dynamic intensity of fly ash decreased with the increasing of loess added to fly ash,and the more loess added,the less dynamic shear stress and vibration time until failure.Secondly,the cohesion of fly ash raised with the increasing of loess amount,but the frictional angle showe...