Experimental Study on Vertical Compressive Bearing Performance of Pre-formed Implanted Pipe Pile
In order to explore the vertical load-bearing characteristics of the novel pile foundation structure,the pre-drilled and implanted pipe pile,based on a highway project in a typical offshore area of Fujian,field test was carried out to provide the load-bearing capacity and stress characteristics of this type of pile foundation.Additionally,numeri-cal simulations based on ABAQUS were adopted to further investigate the influence of solidification parameters on its vertical load-bearing behavior.The field test results show that:in the typical offshore stratum,the pre-fabricated im-planted pipe pile shows the working behavior of friction tip-bearing pile,and its Q-S curve shows a slow-decreasing change,and the top settlement of the pile in the off-limit condition is slightly larger than that of the concrete piles of the same outside diameter;the rotary implanted pipe pile has the best shear performance at the interface of the pile and the periportal soil(rock),and the ultimate friction resistance of the pile is generally higher than that of the other pile types by more than 30%.In the engineering design,it should also need to fully consider the reinforced embedding effect of added solid on the rock layer at the pile end and the influence of bearing characteristics of the pile foundation.150 mm～200 mm and 100 mm～200 mm are adopted as the design thicknesses of cement pile and fine stone concrete pile;it is recommended that the adjustment coefficients of standard value of lateral friction resistance of rotary implan-ted pipe piles at the layers of pulverized clay and strongly weathered tuff should be taken as 1.3 and 1.4～1.7,and take the standard value of ultimate pile tip resistance of precast concrete piles in Technical Specification for Building Pile Foundation(JGJ94-2008)as the base for calculation of pile tip resistance.
pile foundation engineeringpre-formed implanted tubular pilesfield experimentbearing charac-teristicsnumerical simulation
万方数据
维普
