Investigation of preparation of jointed models and the experimental evaluation of mechanical behavior based on 3D printing

被引：0

作者：

Qi Z. ^{[1
]}

Wang P. ^{[1
,2
,3
]}

Zhang B. ^{[1
]}

Lan F. ^{[1
]}

Zhang H. ^{[1
]}

Yuan W. ^{[1
]}

Yan X. ^{[1
]}

Cao X. ^{[1
]}

机构：

[1] School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing

[2] State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, CHN Energy Shendong Coal Group Co.,Ltd., Beijing

[3] National Institute of Clean-and-Low-Carbon Energy, Beijing

来源：

Meitan Xuebao/Journal of the China Coal Society | 2023年 / 48卷

关键词：

3D printing; discrete fractures network; jointed rock mass; rock mechanics;

D O I：

10.13225/j.cnki.jccs.2022.1544

中图分类号：

学科分类号：

摘要：

The existence and distribution of joint structures dominate the deformation and fracture characteristics. The research on the complex joint network of rocks is crucially significant for the stability analysis of rock engineering. The application of the 3D printing technology provides an efficient approach to the study of the mechanical behavior of jointed rock masses. A 3D printing-based fracture rock mass model preparation method was proposed to study the influence of the fracture network on the jointed rock mass. The deformation and failure modes of RDFN, DFN, and no-crack models of varied specimen sizes subjected to uniaxial compression were compared and analyzed. The feasibility of the crystal glue and PLA printed materials on the jointed rock specimen was discussed considering the frozen effect on the crystal specimens. According to the result,the PLA material expands under uniaxial compression pressure and extends plastically,which differs from the natural rock specimens. For solid specimens,the failure mode shows an obvious X-shape shear failure. The material of crystal glue shows plastic deformation,which can be used to simulate rock mass in the pre-peak stage. The specimen with cracks exhibited compression-shear failure along an inclined section of approximately 45°. The existence of joint networks decreased the compressive strength,and the compressive strength of the RDFN model was higher than that of the DFN model. An apparent lock segment effect on the compressive shear process of the jointed specimens was obtained. The Size effect of the jointed specimens under the influence of a 3D printed fractures network was examined. The high plasticity of PLA printed material in the post-peak stage limits the feasibility of the 3D printed models. The compressive strength of the solid specimen reaches the maximum value,followed by the rough RDFN specimen,and the straight DFN specimen reaches the minimum. Under the influence of low temperature,the intact model behaved ductile with the compressive strength of the frozen specimen was reduced to about 56.57%. The failure mode of the DFN model was a single-slope shear failure and the hole model was a split failure,which can simulate the fracture pattern of jointed rock masses under the freezing treatment. © 2023 China Coal Society. All rights reserved.

引用

页码：553 / 562

页数：9

共 29 条

[1] LIU X G, ZHU W C, LIU Y X, Et al., Reconstruction of rough rock joints:2D profiles and 3D surfaces [J], International Journal of Rock Mechanics and Mining Sciences, 156, (2022)
[2] LIN H, XIONG Z, LIU T, Et al., Numerical simulations of the effect of bolt inclination on the shear strength of rock joints[J], International Journal of Rock Mechanics and Mining Sciences, 66, pp. 49-56, (2014)
[3] HAO Xianjie, FENG Xiating, LI Shaojun, Et al., Failure mode of columnar jointed basalt tunnel and its mechanism simulation, Rock and Soil Mechanics, 36, 3, pp. 837-846, (2015)
[4] JU Y, REN Z, ZHENG J, Et al., Quantitative visualization methods for continuous evolution of three-dimensional discontinuous structures and stress field in subsurface rock mass induced by excavation and construction-An overview [J], Engineering Geology, 265, (2020)
[5] ZHU J, ZHOU T, LIAO Z, Et al., Replication of internal defects and investigation of mechanical and fracture behaviour of rock using 3D printing and 3D numerical methods in combination with X-ray computerized tomography[J], International Journal of Rock Mechanics and Mining Sciences, 106, pp. 198-212, (2018)
[6] ZHOU T, ZHU J, XIE H., Mechanical and volumetric fracturing behaviour of three-dimensional printing rock-like samples under dynamic loading, Rock Mechanics and Rock Engineering, 53, 6, pp. 2855-2864, (2020)
[7] LIU Quansheng, HE Fan, DENG Penghai, Et al., Application of 3D printing technology in physical modelling in rock mechanics [J], Rock and Soil Mechanics, 40, 9, pp. 3397-3404, (2019)
[8] ZHAO D, XIA Y, ZHANG C, Et al., Laboratory test and numerical simulations for 3D printed irregular columnar jointed rock masses under biaxial compression[J], Bulletin of Engineering Geology and the Environment, 81, (2022)
[9] XIA Y, ZHANG C, ZHOU H, Et al., Mechanical behavior of structurally reconstructed irregular columnar jointed rock mass using 3D printing[J], Engineering Geology, 268, (2020)
[10] XIA Y, ZHANG C, ZHOU H, Et al., Study on model structure and mechanical anisotropy of columnar jointed rock mass based onthree-dimensional printing method [J ], International Journal of Geomechanics, 20, 11, (2020)

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