Multi-load coupling loading device for testing ocean engineering pile foundation-soil dynamic response

Abstract

The invention discloses a device for loading an ocean engineering pile foundation under the action of horizontal and vertical cyclic loads and an impact load, and particularly relates to a testing device and a testing method for ocean engineering pile foundation-soil dynamic response under the multi-load coupling action. The testing device comprises a cuboid model box, a model steel pipe pile, a fixed support, a horizontal cyclic load loading device, a vertical cyclic load loading device and a horizontal impact load loading device. A load-bearing state of the ocean engineering pile foundationin the whole life cycle is considered; the horizontal cyclic load, the vertical cyclic load and the horizontal impact load can be simultaneously or separately applied, and a soil-around-pile rigidityweakening rule caused by the dynamic response of the ocean engineering pile foundation under the multi-load coupling action and the pile-soil interaction also can be obtained; and the testing device and the testing method have important significance for ocean engineering pile foundation design, construction and maintenance.

Description

technical field [0001] The invention belongs to the field of marine engineering foundation engineering, and relates to a loading device and a test method for marine engineering pile foundations under the action of horizontal and vertical cyclic loads and impact loads, in particular to a test of marine engineering pile foundation-soil dynamic response under the action of multi-load coupling Device and test method. Background technique [0002] In recent years, with the proposal of the strategic concept of "marine power", marine engineering has developed rapidly, and pile foundations have become more and more widely used in marine engineering such as offshore wind turbines, offshore drilling platforms, port terminals, and cross-sea bridges. [0003] The marine engineering pile foundation has a complex working environment and various stress forms. As a supporting member of the superstructure, it bears the self-weight load transmitted from the superstructure to the top of the pi...

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Problems solved by technology

The combined effects of the two lead to the attenuation of the soil stiffness, the increase of the plastic strain and cumulative deformation of the soil around the pile, and the reduction of the bearing capacity of the pile foundation.

Previous studies have shown that pile foundations are more susceptible to instability and failure under composite loading conditions than single cyclic loading

[0005] At present, most of the corresponding engineering designs still use the pile foundation design method under the action of single static load, take the ultimate bearing capacity as the control index, and carry out the design of the pile foundation under the action of cyclic load by greatly increasing the safety reserve of bearing capacity, without much consideration The coupling effect of a cyclic load and the weakening of the soil stiffness around the pile caused by the pile-soil interaction under the cyclic load, this design method cannot predict the cumulative deformation caused by the cyclic load, nor can it predict the pile deformation caused by the coupling effect of multiple cyclic loads. Weakening degree of base bearing capacity

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