A device and method for testing the soil extrusion effect of pipe piles

Abstract

The invention discloses a pipe pile soil squeezing effect testing apparatus and method; the apparatus comprises a model bucket, a pressure chamber, a model pipe pile, tempered glass, a Y-shaped base, a bending element testing device and a digital camera device; the pressure chamber is of semicircular barrel structure with a bottom opening, the bottom of the pressure chamber is sealed with latex film, the pressure chamber is applied to the upper surface of soil in the model bucket, self-gravity of upper soil is simulated under the action of air pressure, the model pipe pile is a sealed top semi-cylinder provided with an air injection hole in the top, upper stress of core soil plug is simulated by applying air pressure to an intra-pile piston, the model bucket base and the Y-shaped base are provided with vertically corresponding exciting bending elements and receiving bending elements at equal intervals, and the elements are externally connected to a data acquisition system. The apparatus and method have the advantages that a true stress environment of soil layers at different depths during pipe pile driving can be simulated, and pipe pile penetration resistance, pile-surrounding soil post-disturbance displacement field, and shear wave can be tested in sync; the apparatus and method also have the advantages of controllable soil plug stress, visualized observation, good operational convenience and the like.

Description

technical field [0001] The invention relates to a device and method for testing the soil squeezing effect of pipe piles, belonging to the technical field of pile foundation engineering. Background technique [0002] Due to its advantages of simple manufacturing process, convenient pile planting, easy quality assurance, low cost, and fast construction speed, pipe piles have been widely used in housing construction, seaport wharves, cross-sea bridges, offshore oil platforms, and offshore wind turbines in recent years. widely used. During the process of static pressure or vibratory pile sinking, the tubular pile will inevitably disturb, reshape and squeeze the surrounding soil, and the shear modulus, density and other parameters of the soil around the pile will inevitably change, making the soil The body exhibits inhomogeneity in the radial direction. The vertical uplift and horizontal movement of the soil caused by the soil squeezing effect may cause the adjacent existing pi...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a test device and method for the soil extrusion effect of pipe piles, which can provide a real stress environment for the simulation of pipe pile sinking at different soil depths, and realize the penetration resistance of pipe piles and the soil disturbance displacement field and shear of piles. The simultaneous test of the shear wave velocity overcomes the defect that the previous indoor model test cannot obtain the evolution of the soil layer properties caused by the squeezing effect

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