A Calculation Method for Settlement of Capped Pile Composite Foundation

Abstract

The invention relates to a method for calculating the settlement of a composite foundation with capped piles, comprising the first step of determining the calculation depth of settlement according to the filling height, dividing the soil layer within the range of the calculation depth of settlement into multiple layers; obtaining the Poisson's ratio of the soil layer and The compressive modulus of each soil layer; the second step is to calculate the compressive modulus of the composite pile; the third step is to calculate the area replacement rate; the fourth step is to obtain The compressive modulus of the composite foundation of each soil layer; the fifth step, calculate the additional stress increment of each soil layer caused by the upper load; the sixth step, calculate the settlement of the reinforcement area and the settlement of the underlying layer; finally, the reinforcement area The settlement and the settlement of the underlying layer are summed to obtain the total settlement of the capped pile composite foundation. The invention proposes the concept of the composite pile body, first calculates the compression modulus of the composite pile body, and then uses the compression modulus of the composite pile body to calculate the compression modulus of the composite foundation of each soil layer, thereby improving the accuracy of settlement calculation results.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and particularly relates to a settlement calculation method of a capped pile composite foundation. Background technique [0002] The vast majority of composite foundations with capped piles are classified into the category of pile-bearing embankments in foreign countries, and the pile cap is the support plate in the pile-supporting embankment. The elastic foundation model is adopted, the reinforced cushion is regarded as a thin plate, and the settlement of the entire composite foundation is calculated by solving the deformation of the thin plate. When the compressive deformation of the cushion is small and has been basically completed during the construction period, it can be ignored. The essence is to solve the deformation of the soil between the piles. Capped pile composite foundations are mostly used for pile-net composite foundations in China. There is no clear calculation method f...

AI Technical Summary

Problems solved by technology

However, there are several problems with this method: first, using the entire pile length as the calculation depth is conservative; second, the compressive modulus of the soil layer between piles is too large when calculated according to the composite modulus, ignoring the interaction between piles and soil; Finally, there are difficulties in determining the soil load sharing between piles, especially the pile-soil stress ratio is difficult to calculate accurately, so the application is limited

For the rigid pile composite foundation, the assumption of equal deformation cannot be strictly satisfied due to the fact that the rigid pile body penetrates up and down.

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