X-ray CT three-dimensional reconstruction and discrete element analysis of the cement paste backfill pore structure under uniaxial compression

Sun, Wei; Hou, Kepeng; Yang, Zhiquan; Yan, Wen

doi:10.1016/j.conbuildmat.2017.01.088

Cited by 101 publications

(44 citation statements)

References 9 publications

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“…Recently, digital image analysis techniques (DIATs) based on X-ray computed tomography (CT) imaging are introduced to geotechnical engineering, 3,4 which provide an effective way to better understand the cracking behaviors and failure process of geomaterials under various stress loading conditions. [5][6][7][8] For example, Sun et al explored the patterns of porosity evolution during the bearing failure of cement paste backfill subjected to uniaxial compression, 9 Takano et al investigated the deformation and the failure of a soil under triaxial compression using in-situ X-ray CT images and digital image correlation. 10 In addition, DIATs based on X-ray CT images can also be applied to investigate the petrophysical parameters of porous geomaterials such as porosity and pore size.…”

Section: Introductionmentioning

confidence: 99%

Digital measurement of 2D and 3D cracks in sandstones through improved pseudo color image enhancement and 3D reconstruction method

Zhao

Zhou

2019

Num Anal Meth Geomechanics

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An integrated approach of improved pseudo color image enhancement (IPCE) method and three-dimensional (3D) reconstruction technology is proposed.The evolution characteristics of two-dimensional (2D) and 3D spatial cracks in X-ray computed tomography (CT) images of sandstones subjected to triaxial compression with confining pressure of 10, 20, and 30 MPa are investigated.The equations of crack width, length, and dip angle are established based on the proposed digital damage ratio. Based on the pseudo color images, point cloud maps with roughness and spatial images of cracks are investigated. The numerical results show that this proposed method is effective to study and understand the fracturing properties of rocks. KEYWORDS3D reconstruction, digital damage ratio, improved pseudo color image enhancement algorithm, triaxial compression test, X-ray CT images

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Section: Introductionmentioning

confidence: 99%

Digital measurement of 2D and 3D cracks in sandstones through improved pseudo color image enhancement and 3D reconstruction method

Zhao

Zhou

2019

Num Anal Meth Geomechanics

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“…e mechanical property of a backfill is a key and hot point for current research on the filling mining technology. However, these recent research studies mainly concentrate on the mechanical properties of backfill in normal temperature [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Impact of Temperature on the Strength Development of the Tailing‐Waste Rock Backfill of a Gold Mine

Han

Zhang

Sun

2019

Advances in Civil Engineering

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This study investigated the influencing rules of curing temperature (5, 10, 16, and 20°C), cement ratio (8%, 10%, 12%, and 14%), and mass concentration (70%, 73%, 74%, and 75%) on the strength of backfill. In addition, a scanning electron microscope (SEM) is employed to analyze the microtopography of the backfill. Experimental results indicate that the uniaxial compressive strength (UCS) of the backfill decreases as the curing temperature diminishes; temperature substantially influences the earlier strength of backfill (it is much significant below 10°C). In addition, as the cement ratio rises, the critical point for the impact of temperature on strength gradually moves toward a low-temperature zone; in pace with the slurry mass concentration increase, the compressive strength of the backfill also rises and its rate of increase enlarges after going beyond the critical concentration. In case the curing temperature is lower than 10°C, the extent of hydration is also low inside the backfill. Through experiments, the critical concentration of slurry in the Jinying gold mine is determined as 73%, and the critical interval of the cement ratio ranged between 10% and 12%. Corresponding measures can be taken to increase the strength of backfill in the Jinying Gold Mine by 129.9%. As a result, backfill collapse is effectively controlled.

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“…Sun et al [29] studied porosity evolution during CPB deformation via a medical X-ray CT technique that revealed the porosity distribution. Wang et al [30] conducted uniaxial compression testing on CWRTB using a real-time industrial X-ray CT technique. The crack damage evolution characteristics were obtained and a corresponding damage constitutive equation was established.…”

Section: Introductionmentioning

confidence: 99%

In Situ X-Ray CT Investigations of Meso-Damage Evolution of Cemented Waste Rock-Tailings Backfill (CWRTB) during Triaxial Deformation

Wang

Zhou

et al. 2019

Minerals

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This work presents an experimental study that focused on the meso-damage evolution of cemented waste rock-tailing backfill (CWRTB) under triaxial compression using the in situ X-ray computed tomography (CT) technique. Although numerous investigations have studied the magnitude of the strength of CWRTB material, the mesoscopic damage evolution mechanisms under triaxial deformation are still poorly understood. Artificial CWRTB samples with a waste rock proportion of 30% were prepared by mixing tailings, waste rock, cement, and water. A specific self-developed loading device was used to match the CT machine to real-time CT scanning for the CWRTB sample. A series of 2D CT images were obtained by performing CT imaging at five key points throughout the test and from three positions in the sample. The CT values, for the purpose of meso-damage evolution in CWRTB, were identified. The results showed that the axial stress–strain curve presented strain hardening characteristics. The CT data revealed the inhomogeneous damage field inside the CWRTB sample and the most severely damaged regions that were usually located at the waste block-tailings paste interfaces. The changes in CT values for the different regions of interest (ROI) revealed the complicated interactions between the waste blocks and the tailings paste matrix. The meso-structural changes, formation of the localized bands, and the associated stress dilatancy phenomenon were strongly influenced by the interactions between the waste blocks and tailing paste.

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X-ray CT three-dimensional reconstruction and discrete element analysis of the cement paste backfill pore structure under uniaxial compression

Cited by 101 publications

References 9 publications

Digital measurement of 2D and 3D cracks in sandstones through improved pseudo color image enhancement and 3D reconstruction method

Digital measurement of 2D and 3D cracks in sandstones through improved pseudo color image enhancement and 3D reconstruction method

Impact of Temperature on the Strength Development of the Tailing‐Waste Rock Backfill of a Gold Mine

In Situ X-Ray CT Investigations of Meso-Damage Evolution of Cemented Waste Rock-Tailings Backfill (CWRTB) during Triaxial Deformation

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