Triaxial test three-dimensional deformation reconstruction and measurement method

A triaxial test and three-dimensional deformation technology, applied in the direction of measuring devices, instruments, optical devices, etc., to achieve the effect of reconstruction

Inactive Publication Date: 2014-03-19
DALIAN UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method to realize the deformation measurement and three-dimensional reconstruction of the whole surface of the sample during the triaxial test, so as to solve the problem that the existi

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[0018] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0019] Such as figure 1 As shown, the scheme for realizing three-dimensional measurement of the present invention includes the following equipment: computer control acquisition system 1, triaxial instrument 2, square triaxial pressure chamber 3, two CCD cameras 4, two tripods 5, triaxial sample 6, The rubber film 7 engraved with black and white squares, the size of the squares is 7mmx7mm. The triaxial instrument is a TSZ10-1.0 strain-controlled triaxial instrument produced by Nanjing Soil Instrument Factory. The square pressure chamber is made of plexiglass material, the wall thickness is 2.0cm, and the side length is 11.0cm. The CCD camera adopts the DH-HV3151UC camera produced by Daheng Image, with a pixel resolution of 2048×1536. The lens is an adjustable focus lens with a maximum focal length of 16mm produce...

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Abstract

The invention discloses a triaxial test three-dimensional deformation reconstruction and measurement method and belongs to the technical field of geotechnical experiment testing. The method is characterized in that a transparent square pressure chamber is adopted, a specially-produced rubber membrane whose label can be tracked is marked, two digital cameras at the front and at the back and a corresponding image acquisition control and processing system are employed, through tracking the position change of the angle points of the rubber membrane on an image, a certain hypothesis is adopted to obtain the space coordinate of the characteristic points of the rubber membrane on the surface of a sample, and the images acquired by the two cameras at the front and at the back are spliced so that the measurement of the three-dimensional deformation of the sample during a triaxial test process is realized. Through combination with ANSYS finite element software, a three-dimensional deformation grid and a three-dimensional whole surface strain field of the sample are obtained. The method provided by the invention has the following advantages: the comprehensive deformation characteristics of the sample in the triaxial test process can be obtained from a front direction and a back direction, and the space positions of surface characteristic points in a triaxial test can be obtained for realizing reconstruction of three-dimensional deformation of the sample, and the distribution of the three-dimensional surface strain field of the sample can be obtained.

Description

technical field [0001] The invention belongs to the technical field of experimental testing of rock and soil mechanics, and relates to a method for reconstructing and measuring the three-dimensional deformation of a triaxial sample for testing soil, gravel and soil-rock mixture. Background technique [0002] Triaxial test technology is one of the most important test techniques in rock and soil mechanics, which is widely used to study the strength, stress-strain relationship of rock and soil materials and construct constitutive models. In the traditional triaxial test, the force sensor is used to measure the stress acting on the sample, and the displacement sensor is used to measure the strain of the soil, and the macroscopic single-value stress-strain relationship of the soil is given. With the deepening and development of rock and soil mechanics research, people began to pay attention to the strain localization of the soil and the formation and development trend and change ...

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Application Information

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IPC IPC(8): G01B11/16G01B11/24
Inventor 赵红华郭靖常艳李鹏飞
Owner DALIAN UNIV OF TECH
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