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Testing method for testing shearing constitutive relation of rock-concrete interface

A technique of constitutive relation and test method, applied in the application of stable shear force to test the strength of materials, preparation of test samples, measuring devices, etc., can solve errors, numerical results and experimental results can not be well matched problem to eliminate adverse effects

Inactive Publication Date: 2017-05-10
DALIAN UNIV OF TECH
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Problems solved by technology

Due to the lack of an accurate shear-type softening constitutive relation, the current numerical research on the composite fracture characteristics of the rock-concrete interface usually uses the shear constitutive relation of concrete to approximate the mechanical behavior of the interface, which leads to inconsistency between the numerical results and the experimental results. Good fit, especially when the shear component dominates, the two will produce non-negligible errors
However, there is no clear standard for determining the shear softening relationship of the rock-concrete interface.

Method used

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  • Testing method for testing shearing constitutive relation of rock-concrete interface

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Embodiment

[0030] A test method for determining the shear constitutive relationship of the rock-concrete interface, the steps are as follows:

[0031] (1) Test preparation

[0032] Fixtures: as shown in Figure 2.

[0033] Concrete: C30 concrete with a water-cement ratio of 0.5 is used, and the rock is granite. The specimen is shown in Figure 2.

[0034] Strain gauges: 8 strain gauges with a grid size of 5×3, and each strain gauge is wired to the data acquisition system to display the strain development on the rock surface.

[0035] Information Acquisition: The data acquisition system records the strain development of each strain gauge. The acquisition accuracy of the acquisition system should be ±0.0000005m / m. The acquisition system records the strain data of the whole loading process.

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Abstract

The invention belongs to the research field of rock-concrete interface rupture, and relates to a testing method for testing a shearing constitutive relation of a rock-concrete interface. The method includes steps of pasting strain slices on the rock surface of a to-be-tested piece at equal spaces along height direction; placing the to-be-tested piece in the middle of the base of a fixing device and a pressing plate, and leveling the concrete outside of the to-be-tested piece to the outside of the pressing plate, leveling the interface of the to-be-tested piece with a groove side of the base, and vertically projecting the rock in the groove, and fixing the pressing plate; adjusting the base position of the fixing device, so that the rock of the to-be-tested piece is vertically projected in a loading head diameter face; fixing the fixing device on a hydraulic servo universal tester, connecting the strain slices with a data collecting system, wherein the data collecting system displays the strain value and change rules of rocks in the loading process and deduces the shearing constitutive relation of a composite interface. The testing method can realize pure shearing and loading, so that the composite interface has the shearing effect only, and adverse effect of other stress factors can be eliminated.

Description

technical field [0001] The invention belongs to the field of rock-concrete interface fracture research, and relates to a new test method for determining the shear constitutive relationship of the rock-concrete interface by using a single-sided shear test device and the geometric parameters of a composite test piece, in particular to a single-sided shear test method. The shear constitutive relationship of the rock-concrete interface was determined. Background technique [0002] In the analysis of crack propagation using nonlinear fracture mechanics, the softening constitutive curve of concrete describes the characteristics of the fracture process area, which is the premise of the application of the concrete fracture model, especially when the finite element program simulates the nonlinear performance of concrete, the softening curve is Required input parameters. Accurately describing the material softening behavior in the fracture damage zone is the basis for fracture analys...

Claims

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Application Information

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IPC IPC(8): G01N3/24G01N1/28G01N1/36
CPCG01N1/28G01N1/36G01N3/24G01N2001/366G01N2203/0012G01N2203/0025G01N2203/0048G01N2203/0075
Inventor 董伟佘吉吴智敏袁文岩吴乔
Owner DALIAN UNIV OF TECH
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