首页|Three-dimensional finite element simulation and reconstruction of jointed rock models using CT scanning and photogrammetry

Three-dimensional finite element simulation and reconstruction of jointed rock models using CT scanning and photogrammetry

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The geometry of joints has a significant influence on the mechanical properties of rocks.To simplify the curved joint shapes in rocks,the joint shape is usually treated as straight lines or planes in most labo-ratory experiments and numerical simulations.In this study,the computerized tomography(CT)scan-ning and photogrammetry were employed to obtain the internal and surface joint structures of a limestone sample,respectively.To describe the joint geometry,the edge detection algorithms and a three-dimensional(3D)matrix mapping method were applied to reconstruct CT-based and photogrammetry-based jointed rock models.For comparison tests,the numerical uniaxial compression tests were conducted on an intact rock sample and a sample with a joint simplified to a plane using the parallel computing method.The results indicate that the mechanical characteristics and failure process of jointed rocks are significantly affected by the geometry of joints.The presence of joints reduces the uniaxial compressive strength(UCS),elastic modulus,and released acoustic emission(AE)energy of rocks by 37％-67％,21％-24％,and 52％-90％,respectively.Compared to the simplified joint sample,the proposed photogrammetry-based numerical model makes the most of the limited geometry information of joints.The UCS,accumulative released AE energy,and elastic modulus of the photogrammetry-based sample were found to be very close to those of the CT-based sample.The UCS value of the simplified joint sample(i.e.38.5 MPa)is much lower than that of the CT-based sample(i.e.72.3 MPa).Additionally,the accumulative released AE energy observed in the simplified joint sample is 3.899 times lower than that observed in the CT-based sample.CT scanning provides a reliable means to visualize the joints in rocks,which can be used to verify the reliability of photogrammetry techniques.The application of the photogrammetry-based sample enables detailed analysis for estimating the mechanical properties of jointed rocks.

X-ray computerized tomography(CT)scanningPhotogrammetryParallel computingNumerical simulationUniaxial compression testDigital image processing

Yingxian Lang、Zhengzhao Liang、Zhuo Dong

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State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,116024,China

School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo,454003,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaHenan Provincial Science and Technology Research Project

4227715041977219222102320271

2024

10.1016/j.jrmge.2023.08.008

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(4)
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