Study Of Extruding Mechanism And Testing Of The Load Bearing Capacity Of DX Squeezed Pile With Expanded Branches And Plates

DX squeezed pile with expanded branches and plates (also known as DX pile) is a newtype of pile developed from normal bored pile. Compared with normal bored pile, its ability toafford the load of individual vertically and unit consumption of concrete is apparently higherand its social and economical profit is obvious.First, this paper conducts a comparative study of two extruding devices (one-wayextruding device and two-way extruding device), and concludes that the bearing capacity ofbranches and plates formed through two-way extruding device is much better than that ofbranches and plates formed through one-way extruding device. After analyzing the process ofplates being formed through two kinds of equipments, the paper provides a method to draw theoutline of two types of dishes respectively, and deduces the formula of dish volume whichaffords the load. Then, with two different experimental locations, the paper studies DX pilein its bearing mechanism and the transferring law with load,and concludes that the Q ? scurve of DX pile is not steep. It is found that the bearing capacity of DX pile is more thantwice of the normal bored pile in soft soil strata, with the same diameter and length. In complexstrata, the end-bearing force of dishes contributes very little to the bearing capacity of DX pilewith super-length and large-diameter, therefore this DX pile is an ending-bearing friction pile.Finally, the author provides a range of ψ pi,the modifying parameter that computes theultimate toe resistance of branches and plates, according to twenty-one quiescent load tests ofDX pile and modifying parameters of experiential formula.