Oblique pile dynamic p-y curve measuring device and measuring method

Abstract

The invention discloses an oblique pile dynamic p-y curve measuring device and measuring method. The device comprises a model box, an air pressure device, a model pile, a rotating angle control deviceand a data acquisition device, and the model pile is arranged in the middle of the model box. The model box is cylindrical and comprises a cylinder body and a top cover; the model pile is a solid pile or a pipe pile segment, the air pressure device comprises a loading airbag, an air inlet hole and a clapboard, and simulates the stress of an upper soil overlying layer by adjusting the pressure ofan airbag; the rotating angle control device comprises an upper tray, a worm gear mechanism, a bottom tray and an isolating airbag; the data acquisition device comprises an accelerometer, a pore waterpressure gauge, a fiber string and an earth pressure box. According to the oblique pile dynamic p-y curve measuring device, a real stress environment is provided for oblique piles at different depthsof soil layer, the inclination angles of the oblique piles are accurately controlled through the rotating angle control device, the synchronous test of dynamic strain and stress is achieved through using a fiber bragg grating sensor device, and the measuring device has the advantage that the angle of the oblique pile is arbitrarily adjustable and the p-y curve is high in precision.

Description

technical field [0001] The invention relates to a measuring device and a measuring method for the dynamic p-y curve of an inclined pile, belonging to the technical field of pile foundation engineering. Background technique [0002] Because of its good horizontal load-bearing performance, inclined piles have been widely used in projects such as docks, marine structures, and large-scale transmission lines, but there are still some controversies about their seismic performance. When the earthquake is strong, the inclined pile is prone to damage. On the one hand, it loses its horizontal bearing capacity, and on the other hand, it will cause a large residual displacement, which is not easy to repair. As the relationship curve between pile-soil interaction force and relative displacement, the dynamic p-y curve is suitable for small displacement and large displacement because it considers the nonlinearity of soil and avoids the selection of constitutive relationship. Applied to th...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a measuring device and method for measuring the dynamic p-y curve of inclined piles, which can provide real stress environments for inclined piles at different soil depths, and precisely control the inclination angle of inclined piles by rotating an angle control device, and utilize The optical fiber grating sensor device realizes the simultaneous test of dynamic strain and stress, which overcomes the defect that the previous indoor model test cannot obtain the dynamic p-y curve of the inclined pile at any depth and has a large error

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