Test method and test device for studying steel-soil contact surface mechanical property

Abstract

The invention discloses a test method for studying steel-soil contact surface mechanical property, and the test method includes the following steps: 1) preparation of a sample: steel-soil contact surface mechanical property test samples are prepared, wherein the samples includes a cylindrical soil sample and a steel structure sample which is sleeved on the cylindrical soil sample, a hollow loaded through-hole is arranged in the center of the cylindrical soil sample; 2) cylindrical soil sample consolidation: the cylindrical soil sample is consolidated by that the loaded through-hole adds a radial load to the cylindrical soil sample; 3) loading: an axial load is added over the steel structure sample, the axial load acting on the steel structure sample and the displacement changes of the steel structure sample relative to the cylindrical soil sample are measured for cylinder. The invention further discloses a test device for studying the steel-soil contact surface mechanical property. The test method and the test device for studying the steel-soil contact surface mechanical property can not only meet simulation test requirements for the steel-soil contact surface mechanical property, but also reduce the requirements for structure sizes of the steel specimens and reduce test cost.

Description

Technical field [0001] The invention relates to a method and a device for testing the strength characteristics of a solid material by mechanical stress, in particular to a test method and a device for studying the mechanical characteristics of a steel-soil interface under indoor test conditions. Background technique [0002] In steel pipe piles, steel sheet piles, steel tube pile foundations and other underground steel structure projects, the mechanical properties of the steel-soil contact interface is one of the concerns of designers. [0003] At present, the main test methods for studying the mechanical properties of the soil-structure interface are the direct shear test (the test instrument is the direct shear tester) and the simple shear test (the test instrument is the single shear tester). In the direct shear test, the structural material is placed in the lower box of the direct shear instrument, and the soil sample is placed in the upper box of the direct shear instrument. H...

AI Technical Summary

Problems solved by technology

However, the direct shear test has the following shortcomings: (1) The area of ​​the contact surface gradually decreases with the increase of the shear displacement during the shear test; (2) The position of the shear failure surface is limited to the upper and lower shear boxes. (3) During the shear test, the distribution of shear stress and shear strain on the contact surface is uneven

Due to the strict geometrical requirements of the lower box of the direct shear instrument and the simple shear instrument, the cost of preparing steel specimens that meet the test requirements is relatively high, so that the direct shear test and the simple shear test cannot be well used to study the steel-soil contact interface mechanical properties

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