Opened tubular pile hammering injection and static load simulation experiment device and method

Abstract

The invention provides an opened tubular pile hammering injection and static load simulation experiment device and method. The simulation experiment device comprises a model box, a model pile, a vertical column assembly, transverse beam assemblies as well as a piling assembly and a static load assembly, wherein the model pile comprises an outer cylinder, an inner cylinder, a semicircular steel plate and a guide rod column; axial and radial sensors are arranged on the walls of the inner cylinder and outer cylinder; the vertical column assembly comprises four vertical columns which are in rigid connection with the periphery of the model box; the transverse beam assemblies comprise lower transverse beam assemblies and upper transverse beam assemblies; the pulley assembly is connected between the upper transverse assemblies. Compared with the prior art, the simulation experiment device has the advantages that a real stress filed of a soil mass can be simulated, and the friction on the inner and outer sides of the wall of an opened tubular pile can be respectively measured; the defect that in the prior art, the real load transfer process of the opened concrete tubular pile cannot be measured is overcome. Moreover, the simulation experiment device is simple to operate, and the simulation experiment 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 hammer penetration and static load simulation experiment device and 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 ope...

AI Technical Summary

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

Images