Testing device and testing method of pile composite foundation combined with broken stone hardcore foundation

Abstract

The invention discloses a testing device and testing method of a pile composite foundation combined with a broken stone hardcore foundation. A seismostation full-model dynamic test focuses on researching the displacement, strain and acceleration changes of the foundation form under the action of horizontal dynamic loading, and the dynamic response, the failure mode and the shock absorption characteristic of the foundation form are analyzed and researched. The foundation form is researched by a PIV camera half-model static test in a macroscopic, microcosmic and multiscale mode, the displacement, strain and other responses of the foundation under the action of horizontal and vertical static loading are researched macroscopically, and the bearing mechanism and the failure mode of the foundation form are microcosmically analyzed in the aspect of the particle size according to particle displacement, rotation, the local porosity and other microcosmic parameters. The dynamic model test and the static model test are comprehensively applied, the bearing mechanism and the failure mode of the foundation form can be visually inspected, the shock absorption effect of the foundation form is effectively analyzed, the wider research of the academic world on the foundation form is promoted, and the foundation form can be applied to practical engineering as soon as possible.

Description

technical field [0001] The invention relates to research and analysis in the field of shock absorption and anti-seismic structures, in particular to a test device and a test method for a pile composite foundation combined with a crushed stone cushion foundation. Background technique [0002] Bridges and structural engineering are expensive and have huge social functions. Their safety and durability are very important, and earthquakes are one of the main reasons for the damage of such structures. At present, domestic and foreign researches on large-scale bridge and structural anti-seismic shock absorption technology are not only a hot spot but also face many difficulties to be solved. As the span of bridges and the volume of building structures become larger and larger, they are more sensitive to the vibration effects caused by earthquakes. The usual anti-seismic technology route is to increase the burial depth of bridges and structural foundations, and increase the dimension...

AI Technical Summary

Problems solved by technology

The usual anti-seismic technology route is to increase the burial depth of bridges and structural foundations, and increase the dimensional stiffness of structural members, but this method not only increases the cost but also brings a lot of waste of resources. For this reason, the academic community has proposed a A new foundation form, this foundation form comprehensively adopts pile composite foundation and crushed stone cushion, combines pile composite foundation, crushed stone cushion and caisson foundation, uses pile composite foundation to improve foundation bearing capacity, and uses crushed stone cushion Reducing the horizontal seismic shear force can improve the seismic performance of the foundation under the condition of ensuring the bearing capacity of the foundation

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