Test system capable of researching foundation mechanical behavior under action of cyclic moving load

Abstract

The invention relates to a test system capable of researching a foundation mechanical behavior under the action of a cyclic moving load. The test system comprises a rigid model box, a counter-force rack, a foundation simulating sub-system, a static-dynamic coupling load loading subsystem, an image acquisition subsystem and a data control and acquisition subsystem. Compared with the prior art, thesystem can apply preconsolidation pressure by means of an auxiliary steel plate first before the test; after soil body sedimentation is stable, a small vertical load (or the same vertical load) is applied to a soil body to stable the deformation of the soil body; foundation soil bodies with different OCR at different depths can be obtained in the process; three electro-hydraulic servo actuators which are controlled independently are set to have certain phase difference to simulate the mobility of load, and the requirement of principal stress rotation of a foundation soil body unit can be met.Moreover, the application of moving loads at different speeds is simulated by changing the frequency of the cyclic moving load.

Description

technical field [0001] The invention relates to a test system for studying the mechanical behavior of the foundation, in particular to a test system which can be used for studying the mechanical behavior of the foundation under the action of cyclic moving load. Background technique [0002] With the development of social economy and the acceleration of urbanization, various infrastructures have been extensively constructed, and at the same time, geotechnical engineering problems that cannot be solved by current theories have arisen. Among them, the deformation of foundation soil and subgrade soil under the action of cyclic moving load has always been paid attention to by engineers and researchers, including the long-term deformation stability of the foundation under wave load and traffic load, and soil liquefaction caused by earthquake and vibration load. question etc. For these complex geotechnical engineering problems, research is mainly carried out through experiments to...

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Problems solved by technology

[0005] Compared with the indoor model test, the field test is costly and complicated to operate, especially with engineering differences. During the test, it is difficult to obtain soils with different buried depths and different stress histories as research objects, and the test results cannot be scientifically guided. Therefore, the use of physical model tests to study the stable state and long-term deformation characteristics of over-consolidated foundations under cyclic traffic loads has important engineering application value

Under the dynamic load of long-term reciprocating traffic, the direction and magnitude of the stress axis of the super-consolidated foundation are coupled and changed. There are many theoretical difficulties in the deformation law of the foundation under this complex dynamic load and the mechanical mechanism it depends on, which leads to the settlement prediction during the operation period. The theory is not perfect, the calculation accuracy is low, and the traditional model test can only realize the cyclic loading of the load, cannot simulate the mobility of the load, and cannot meet the engineering needs

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