红砂岩中矿物颗粒的塑性应变分析

doi:10.11872/j.issn.1005-2518.2019.04.557

Abstract

Abstract:

Seldom scholars have investigated the strain and stress state of mineral particles in the rock on the microscopic scale in experiment.At the same time，due to the complex shape of the internal particles of the rock，it is necessary to find suitable research methods and high-precision research instruments.Therefore，for quantitative research on the plastic strain and stress of mineral grains in sandstone under uniaxial compression，X-ray CT was used to scan three-dimensional structure for sandstone (spatial resolution of 4.6 micrometers) to investigate the movement behavior，and put forward the method of deformation gradient tensor calculation of mineral particles to investigate the plasticity of the grains and conduct statistical analysis of the results.Firstly，the displacement of sandstone mineral particles is extracted.At the same time，non-local means filtering algorithm is used to denoise images of sandstone.Then，based on the three-dimensional structure of sandstone，different mineral components are segmented.The principle strains and stress are obtained by and the deformation gradient of sandstone mineral particles.The results show that the filtering algorithm has a significant improvement effect on the CT image of sandstone.In addition，based on the X-ray CT in-situ test results of sandstone，there are relatively complex strain behaviors and stress responses in the sandstone，and significant differences in the deformation behaviors between the fracture zone and the non-fracture zone.Rock grains in Z axis direction experience compressive stress，and in the XY plane are under the effect of tensile stress.At the same time，mineral grains exist larger plastic strain，and the internal grains test of strain and stress is greater than strain and stress the sample at macro-scale.The grain plastic strain in the fracture zone and the non-fracture zone is about 30 times and 5 times bigger than on the macroscopic strain of the sample respectively，which indicate that the deformation behavior in in the microscopic of red sandstone is significantly different from that in the macroscopic sample.This method plays an important role in revealing the internal structure of rock mass and the evolution process of stress and strain state.

Key words: rock mechanics, X-ray computed tomography, plastic strain of grains, strain components, stress components, image filter, grain strength

CLC Number:

TU45

Chundi FENG,Rendong HUANG. Plastic Strain Analysis of Mineral Particles in Red Sandstone[J].Gold Science and Technology, 2019, 27(4): 557-564.

Figures/Tables 11

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Plastic Strain Analysis of Mineral Particles in Red Sandstone

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