A test method and device for simulating soil deformation characteristics under dynamic train load

Abstract

The present invention discloses a testing method and device for simulating deformation characteristics of a soil mass under dynamic train load; by modifying a traditional one-dimensional static consolidometer, it is possible for the device to apply axial dynamic cyclic load, it is convenient to develop quantitative analysis for axial compressive deformation of soil mass under dynamic train load and lateral confinement, equivalent dynamic compression curve and empirical dynamic consolidation equation for the soil mass are obtained, equivalent dynamic deformation parameters for the soil mass are further calculated, and the demand for large-scale engineering practice is met for through the experiment with multiple groups of samples. Compared with traditional geotechnical engineering indoor dynamic testing methods using dynamic triaxial instruments and hollow cylinder torsional shear apparatus, the testing method and device disclosed herein have simple structure and reasonable production cost, the testing method is quick to perform, the result data are highly stable, and basis is laid for the accurate calculation and design of railway subgrade dynamic long-term settlements.

Description

technical field [0001] The invention relates to geotechnical testing technology in railway geotechnical engineering, in particular to a testing method and device for simulating soil deformation characteristics under train dynamic load. Background technique [0002] The settlement calculation of the railway foundation in the project under the cyclic dynamic load of the train is mostly a pseudo-static method, that is, the train load is empirically equivalent to the embankment's own weight load for calculation, and the stress of the foundation under the long-term cyclic load of the high-speed train is not considered. Field and dynamic deformation law. Due to the difference in the settlement and deformation mechanism of the soil under static and dynamic conditions, the settlement calculated by the pseudo-static method is mostly smaller than the actual settlement, and the calculation results are not safe. [0003] When studying the dynamic calculation model of long-term settleme...

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Problems solved by technology

[0007] In order to overcome the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a test method and device for simulating the deformation characteristics of soil under dynamic train loads. Through the transformation of the traditional one-dimensional static consolidation instrument in the past, it Axial dynamic cyclic load can be applied, quantitative analysis of soil axial compression deformation under train load and confinement conditions can be carried out, the equivalent dynamic compression curve and empirical dynamic consolidation equation of soil can be obtained, and the relevant dynamic deformation of soil can be further calculated parameters, and meet the needs of large-scale engineering practice through simultaneous testing of multiple sets of samples

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