Testing device and method for observing shear deformation failure characteristics between tubular pile and grouting soil body

Abstract

The invention discloses a testing device for observing shear deformation failure characteristics between a tubular pile and a grouting soil body. The testing device comprises a fixing platform, a tubular pile model testing box, a loading mechanism and a monitoring system, wherein the fixing platform comprises a base plate, a top plate and a plurality of connecting screw rods; the tubular pile model testing box comprises a bottom wall, two side walls, a rear wall and a front wall, wherein the front wall is movably arranged between the side walls, and is made of colorless transparent organic glass; the monitoring system comprises a displacement sensor, a pressure sensor and a strain rosette group arranged on the outer surface of the tubular pile; the strain rosette group comprises a plurality of strain rosettes which are uniformly distributed along the central axis direction of the tubular pile, and are connected with an automatic recorder. According to the invention, a semi-circular pipe pile is adopted, so that the shear deformation failure characteristics between the tubular pile and the grouting soil body can be observed conveniently, and the shear resistant intensity between the tubular pile and the grouting soil body can be observed; a camera device is adopted for recording the video of the testing process; the visual testing enables the analysis to be relatively intuitive.

Description

technical field [0001] The invention belongs to the technical field of civil engineering test devices, and in particular relates to a test device and method for observing shear deformation and failure characteristics between pipe piles and grouted soil. Background technique [0002] The study of mechanical properties between structures and grouted soil is one of the important topics in the field of geotechnical engineering, and it is the premise to solve the interaction between structures and grouted soil. Traditional test devices: simple shear instrument, direct shear instrument, torsional shear instrument, and cyclic loading shear instrument, all artificially assume that the contact interface between the structure and the soil is the failure surface, but in fact the interface between the structure and the soil is sheared when the interface shears. The strength may be higher than the shear strength of the soil itself, so that the shear failure surface occurs inside the soil...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of the existing test equipment, such as low test accuracy, low test intuitiveness, unreliable sampling, and large dispersion of test results, to provide a method that is easy to operate, accurate in test, close to engineering practice, and Shear test device and complete set of test methods for convenient observation of shear deformation and failure characteristics of pipe piles and grouted soil

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