砂浆胶-水泥改良膨胀土试验研究OACSTPCD

In order to improve the expansive soil of the channel from Suqian to Lianyungang,the medium expansive soil of 0.5-2 m below the surface is selected,and different proportions of polymer mortar glue and cement mixture are added to the soil.The physical and mechanical properties of the improved expansive soil are studied by direct shear test,expansion rate test,dry-wet cycle test and crack analysis.The tests show that,with the increase of mortar glue and cement incorporation and curing days,the cohesion and internal friction angle of expansive soil increase significantly,and the expansion rate decreases.The cracks of the improved expansive soil are obviously reduced,and will not increase with the increase of the number of dry and wet cycles.Therefore,the strength of the improved expansive soil is obviously improved and the expansion and contraction are obviously reduced.The effect of mortar glue and cement to improve expansive soil is remarkable,and the cost is low.It is superior to other improvement methods and can meet the engineering needs.