Research On The Shaft Resistance, Base Resistance And Settlement Of Large-Diameter Pile

This paper bases on the test data of a great volume of large-diameter pile, The behavior of the shaft resistance and base resistance and settlement of large-diameter pile is analyzed .The method of testing the base settlement of pile bottom i's introduced in this paper, How to use the characteristic of P-St, Sb, Ss, curve in engineering practice is then discussed. A simple formula to calculate the settlement of pile under the service load is conducted by the theoretical correlation between pile top settlement and pile base settlement.Bases on the mass field test data of large-diameter pile, The characteristics of the load transfer and the proportion of side resistance and end resistance of piles socketed in gravel, silt clay on soft soil foundation. At the same time, this paper put forward a new method of using the end settlement to part the side resistance and the end resistance of piles and using the difference between the top settlement and the end settlement to determine the mass of piles.An elastic-plastic finite elements procedure(3D- a) is set up to analyze the factor influencing the pile top settlement, base settlement, compression of pile shaft and the load transfer of pile, the parameters of large-diameter piles, such as the pile length and diameter, the property of superstratum soils and the rock in the pile base, the thickness of sludge beneath the pile bottom and around the pile shaft, the length of rock socketed are analyzed, the ultimate capacity, the pile top settlement and pile base settlement, the relationship between the shaft resistance and base resistance, the elastic compression and plastic compression of pile concrete under the ultimate load are then discussed, The result can be used in the design and theory research.According to the relevant technical codes and specifications, a procedure to analyze the test data of piles is designed in VC++ language, it can analyze the field test data of kinds of piles and foundations, the procedure already be used in engineering construction and the result is correct.