光固化3D打印在复杂裂隙岩体研究中的探索

doi:10.11896/cldb.20090297

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Abstract Due to the complexity of rock mass structure, the reconstruction of physical model specimen containing fracture network is one of the key problems in the experimental study of rock mechanics. A method for preparing rock-like specimen containing fracture network based on the stereolithography 3D printing was proposed. The digital image correlation method was used to non-contactly measure the full-field deformation of rock-like specimen containing fracture network during the loading process. The failure evolution law and the precursory anomaly characteristics of fractured rock were quantitatively studied by using the variance of strain field. The results show that the complex physical model of fractured rock can be reconstructed by using the stereolithography 3D printing. The deformation and failure process of rock-like specimen containing fracture network has similar features with natural rocks, which can be divided into four stages including closure, elastic deformation, crack propagation and post-peak stage. The stress-strain curve shows multi-step drops after the stress peak. According to the strength parameters, post-peak mechanical properties and block ejections during the experimental process, the specimen prepared by the stereolithography 3D printing is suitable for simulating fractured hard rock. Strain fields of fractured rock can be dynamically captured by using the digital image correlation method. Strain localization is observed during the deformation and failure process. The variance of strain field in the loading process can be divided into four stages including initial differentiation, stable differentiation, acceleration differentiation and accelerated acceleration differentiation. The variance of strain field presents a trend of stable increase after new crack initiation. Then it presents a sharp increase trend while the specimen is at the unstable crack propagation stage. These can be regarded as two precursor points. The results can provide a new perspective for physical reconstruction and instability early-warning of complex fractured rock masses.

Key words： 3D printing stereolithography fractured rock mass fracture network digital image correlation method mechanical characteristic deformation field

Published: 10 September 2022 Online: 2022-09-10

CLC number:

TU452

Fund:National Natural Science Foundation of China (11902128) and the Applied Basic Research Foundation of Yunnan Province (2018FB093, 2019FI012).

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	Articles by authors
	ZHANG Ke
	YE Jinming
	LIU Xianghua

Cite this article:

ZHANG Ke,YE Jinming,LIU Xianghua. Exploration of Stereolithography Apparatus 3D Printing Technology in the Research of Complex Fractured Rock Mass[J]. Materials Reports, 2022, 36(17): 20090297-6.

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http://www.mater-rep.com/EN/10.11896/cldb.20090297 OR http://www.mater-rep.com/EN/Y2022/V36/I17/20090297

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