水泥土搅拌桩止水帷幕工程特性研究

Engineering Properties of Waterproof Curtain from Cement Mixing Piles

水泥土搅拌桩作为基坑止水帷幕已经得到了广泛应用,为了更深入的理解作为止水帷幕的水泥土的工程特性,通过对不同水泥掺入量的水泥土无侧限抗压强度和渗透系数的室内试验研究,利用CBR-1承载比试验仪和TSS-2柔性壁三轴渗透仪对水泥土进行了无侧限抗压强度和渗透试验,分析了养护龄期及水泥掺入量对水泥土的无侧限抗压强度和渗透系数的影响。试验结果表明,水泥土的无侧限抗压强度随养护龄期和水泥掺入量的增大而增大,并通过曲线的拟合,得出了无侧限抗压强度的预测公式;渗透系数随养护龄期和水泥掺入量的增大而减少,通过数据对比得出28天之后水泥土渗透系数主要是受水泥掺入量的影响。

Cement mixing pile has been widely used as waterproof curtain in foundation,in order to have a further understanding about mechanical properties of cemented soil as waterproof curtain,this paper takes a laboratory test to study the unconfined compressive strength and permeability of cemented soil with different cement content. The experiment on unconfined compressive strength and permeability of cemented soil is carried out using the bearing ratio test instrument CBR-1 and flexible wall triaxial permeameter TSS-2 and the influence of curing period and cement content on unconfined compressive strength and permeability of cemented soil is analyzed. The result shows that unconfined compressive strength of cement soil increases with curing period and cement content,and by fitting the curve the prediction formula of unconfined compressive strength is obtained. The permeability decreases with increase of curing period and cement content. By contrasting the data,it shows that after 28 days the permeability coefficient of cemented soil is mainly affected by cement content.