Calculation method of pile driving resistance in precast piles

Abstract

The invention discloses a method for calculating pile sinking resistance in static-press piling of a prefabricated pile. The method comprises the following steps: 1, determining pile lateral friction and pile tip resistance of all soil layers and a vertical layer number of a pile sinking foundation; 2, calculating pile lateral friction of the soil layers above a target vertical layer; 3, calculating the pile lateral friction and the pile tip resistance of the target vertical layer and building an over-determined equation set; 4, solving adjustment coefficients alpha(j) and beta(j) in the target vertical layer; 5, determining an expression of the pile sinking resistance of the prefabricated pile. In the method, a least square method and an average solution method are applied directly to realize optimal solution of the adjustment coefficients, so that a solving progress is more programmed and intelligent, calculation solving of the whole solving process can be realized directly through programming, and high calculation efficiency and high calculation accuracy are achieved.

Description

technical field [0001] The invention relates to the field of pile foundation construction in geotechnical engineering, in particular to a method for calculating pile sinking resistance in the process of static pile pressing of prefabricated piles. Background technique [0002] Pile foundations are widely used in the field of geotechnical engineering. In addition to bearing vertical compressive loads in general industrial and civil buildings, they are also used in bridges, ports, highways, railways, docks, offshore drilling platforms, and retaining structures. And bear horizontal load and vertical compressive or pullout load in seismic engineering. According to the method of pile formation, the pile foundation can be divided into driven piles, cast-in-situ piles and static pressure piles. Among them, cast-in-situ piles form the pile body structure by pouring concrete into the prefabricated pile holes, which are more likely to cause hole collapse and mud pollution environment...

AI Technical Summary

Problems solved by technology

The calculation of pile sinking resistance through the method of comprehensive adjustment coefficient generally needs to be realized by programming, but because it is necessary to manually change the adjustment coefficient of pile end resistance and pile side friction resistance, it is not convenient to implement the program, and it is difficult to meet the requirements of fast calculation. There is a lot of randomness and contingency in the process of determining the adjustment coefficient, which often leads to the situation that there are multiple solutions to the final adjustment coefficient of the same soil layer, which also limits the application of the comprehensive adjustment coefficient method in the calculation of pile sinking resistance to a certain extent.

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