Research On The Static Presseure Of The Small Diameter Steel Pipe Pile

Have clear force, construction steel pipe pile is simple, the advantages of no pollution, safe and reliable. With a diameter among ? 250 mm common in both the construction of small diameter pile foundation underpinning, rectifying and jack-up reinforcement project.Paper, combined with the actual project of ? 180 x6, ? 194 x 6, ? 219 x 8,three kinds of small diameter steel pipe pile in collapsible loess, saturated silt region carried out experimental study. On this basis, using the in situ measurement, theoretical analysis and numerical simulation method, the bearing mechanism of the small diameter steel pipe pile, bearing capacity calculation method, influence factors are analyzed. Paper’s main work includes:Paper’s main work includes:(1) Of different types and different length and the small diameter steel pipe pile bearing capacity of the soil layer in the scene in situ measurement and comparative analysis, the results show that the bearing of the bearing capacity of pile in construction stage, control of pile side friction resistance affected by soil structure is obvious.(2) According to the measured data, the comparison of the steel pipe piles in the construction process of the formation of the characteristics of soil plug and change rule; By the method of data processing, analysis the change characteristics of the bearing capacity of steel tubular piles with time; Analyzed the compaction effect of pile to soil disturbance.(3) Combined with common static pressure pile in the engineering construction technology characteristics, the small diameter steel pipe pile driving mechanism is analyzed.(4) Based on the characteristics of the small diameter steel pipe pile bearing capacity of single pile, pile length curve and physical- mechanical properties of soil, the correlation of modified formula of bearing capacity of single pile is given.