A simulation experimental device and experimental method for hammer penetration of open pipe piles

Abstract

The present invention provides an open pipe pile hammer penetration and static load simulation experiment device and experiment method. The simulation experiment device includes a model box, a model pile, a column component, a beam component, and also includes a piling component or a static load component. The model pile includes an outer cylinder, an inner cylinder, a semicircular steel plate, and a guide rod cylinder. The walls of the inner cylinder and the outer cylinder are provided with axial and radial sensors. The four columns are rigidly connected, the beam assembly includes a lower beam assembly and an upper beam assembly, and the pulley block is connected between the upper beam assemblies. Compared with the prior art, the present invention has the advantages of being able to simulate the real stress field of the soil and measuring the internal and external frictional resistances of the pile wall of the open pipe pile, etc., and overcomes the inability to measure the real load of the open concrete pipe pile in the prior art Defects in the transfer process; moreover, the experimental device is simple to operate and the experimental method is convenient.

Description

technical field [0001] The invention belongs to the technical field of construction, and in particular relates to an open pipe pile hammering penetration simulation experiment device and an experiment method. Background technique [0002] Concrete pipe piles are widely used in industrial and civil buildings, port engineering and bridge engineering, and the pile end opening is the most commonly used form. To reveal the response of the foundation soil when the open concrete pipe pile penetrates and the bearing capacity behavior of the foundation pile when it is loaded after construction is the basis for the rational design and use of the open concrete pipe pile, and the indoor model test is an important means to achieve this goal. The special feature of the open concrete pipe pile is that when the pile penetrates into the foundation soil, part of the soil squeezes into the pile hole to form a soil plug. Due to the existence of soil plugs, the bearing capacity of open concrete...

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Problems solved by technology

Due to the existence of soil plugs, the bearing capacity of open concrete pipe piles has not been truly revealed so far, especially the friction and shear characteristics between the soil plugs and the pile wall. This is mainly due to the following problems in the existing test devices and methods: (1) Conventional 1g model test is difficult to simulate the stress level of in-situ soil, while geotechnical centrifuge test is currently the most common method to simulate ng gravity field, but this method is complicated in technical operation, expensive in test cost, and difficult to realize The real-time acquisition of images cannot realize the visualization research of the pile-soil microcosmic mechanism of multi-samples

(2) The existing model test devices for open concrete pipe piles use single-wall model piles, but the model test based on this device cannot separate the friction resistance of the inner and outer sides of the pile wall, so the friction of the inner wall of the pile cannot be measured. The distribution law of resistance and radial earth pressure, so it is impossible to know the real load transfer process of open concrete pipe piles

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