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通过室内无荷载膨胀率和有荷载膨胀率试验,对芜申航道胥河段原状膨胀土的膨胀速率和膨胀率进行了研究。根据竖向荷载的大小,将膨胀土单向浸水膨胀过程分为无荷作用、小荷载作用、大荷载作用3类,又对每一类浸水膨胀过程分别进行了分段。研究了在不同荷载作用下,膨胀率、膨胀后干密度、膨胀后孔隙比和膨胀后含水率的变化规律。结果表明:随着荷载的增大,有荷膨胀率减小,土样浸水膨胀稳定后干密度增大,膨胀稳定后,孔隙比、含水率减小。最终竖向膨胀率与吸水率呈正的半对数关系。根据工程中允许土体产生的变形,确定允许膨胀稳定后的膨胀力,从而进行挡土墙的设计。
The expansion rate and expansion rate of undisturbed expansive soil in Wuhe section of Wuhu River were studied through indoor no-load expansion rate and load expansion rate test. According to the size of vertical load, the unidirectional soaking and expansive process of expansive soil is divided into three categories: no-load action, small-load action and large-load action, and each kind of submerged expansion process is segmented separately. The changes of the expansion rate, the dry density after expansion, the void ratio after expansion and the moisture content after expansion under different loads were studied. The results show that with the increase of load, the load expansion rate decreases, and the dry density increases after soaking and swelling in soil samples. When the swelling is stabilized, the void ratio and water content decrease. The final vertical expansion rate and water absorption showed a positive semi-logarithmic relationship. According to the project allows the soil deformation, to determine the expansion of stability after the expansion of force to be retaining wall design.