Experimental Study on Lower Slurry-paved Cap of Cement Soil Mixing Pile in Soft Soil Foundation Treatment

Cement-soil mixing method, which is of simple construction, low cost, and can effectively improve the properties of foundation soil,has been widely used in soft soil foundation treatment; however,slurry appear in the construction process brings some construction progress related and economic troubles.Combining with project case,this paper introduced the construction technology of cement-soil mixing pile( wet method) treatment for soft soil foundation,expounded a new method which takes slurry pavement on the mixing pile top as the lower cap of the foundation bed,and then makes level against the cushion. The result of static load test on composite foundation show that the settlement of the foundation treated by this new method,compared with the conventional method,reduces by half,and due to the layer of slurry appear,the stiffness of the soil layer on the upper part of the pile is improved,which helps to increase the composite foundation's bearing capacity. This method makes for control of foundation settlement, reduction of construction period and project cost saving.