Interlayer direct shear testing device and testing method

Abstract

The invention relates to an interlayer direct shear testing device and a testing method and provides an interlayer direct shear testing device applied to pavement structure double-layer type samples. The interlayer direct shear testing device comprises an upper shear box, a lower shear box, a vertical loading device and a transverse loading device, wherein the upper shear box is capable of changing holding volume so as to be adapted with the structure of the upper layer of each tested pavement structure double-layer type sample; the lower shear box is capable of changing the holding volume so as to be adapted with the structure of a lower structure of each tested pavement structure double-layer type sample; the vertical loading device is used for directly or indirectly applying predetermined vertical load to the tested pavement structure double-layer type samples; the transverse loading device is used for directly or indirectly applying predetermined shear force to an interlayer interface among components of the upper layer and the lower layer of each tested pavement structure double-layer type sample. In addition, the invention also provides a testing method applied to the interlayer direct shear testing device. The interlayer direct shear testing device can be applied to pavement structure double-layer type samples with different plane sizes and heights.

Description

technical field [0001] The invention relates to an interlayer direct shear test device, in particular to an interlayer direct shear test device and a test method for a pavement structure double-layer test piece. Background technique [0002] The interface between the existing asphalt pavement structure layers is often not completely continuous, but the shear strength of the asphalt pavement designed according to the theory of complete continuity between the layers stated in the code is often relatively safe, and cannot truly reflect the actual combination of the interface. state. Therefore, it is particularly important to obtain the actual combination performance parameters of the pavement. At present, the plane size of the sample used for the direct shear test is fixed and cannot be adjusted, but the research in the field of experimental mechanics has shown that the size of the sample used in the test will have a relatively large impact on the test results (that is, the so...

AI Technical Summary

Problems solved by technology

However, the shear box of the fixed specimen of the direct shear test device used in the field of pavement engineering is a fixed structure, which means that it cannot be applied to the angle of theoretical research to make the plane size of the specimen adjustable, and also means that The samples taken out at the engineering site also need to be cut twice before they can be used for testing, which will lead to the destruction of the structure of the test piece and reduce the accuracy of the test results

[0003] In addition, the field sampling used for direct shear tests is often a cylindrical sample obtained by core drilling on the road surface, and the core drilling machine may be damaged due to subjective and human factors or objective reasons of equipment during the drilling and extraction process. The core sample is disturbed, which destroys the interlayer interface, and the interface parameters measured by the test are not true

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