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| Application and prospect of 3D printing technology to physical modeling in rock mechanics |
| JIANG Quan1,SONG Leibo2 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;2. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Northeastern University,Shenyang,Liaoning 110819,China) |
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Abstract The production of rock/rock mass physical models with defects or complex geological structure has been one of the bottlenecks hindering the development of mechanical tests of rock. 3D printing(3DP) technology can create conveniently 3D entities with complex structures,which provides an unprecedented opportunity to break through this bottleneck. In this paper,the model samples with multiple holes and pre-existed cracks are prepared with the powder-gypsum as the printing material. The mechanical tests show that the two models are similar to those of rock materials in characteristics of deformation,failure and strength and in processes of crack extension. The physical models of tunnel with a single fault and the lining with bolts are made by powder gypsum and PLA material. The experimental results of these models show that the existence of faults reduced the stability of tunnels,the support system of bolts and lining improved effectively the bearing capacity of the Chamber and the 3DP tunnel model simulate nicely the failure process of the tunnel. Moreover,a new method that combines 3D optical scanning and 3DP to prepare models with natural joint surface is presented. The proposed method replicated well the morphological features of natural joints,and the shear properties and failure characteristics are stable and consistent. In conclusion,the preliminary mechanical tests above have proved the feasibility of 3DP technique in the experimental study of rock mechanics. In the final part of the article,the broad prospect of 3DP technology in rock engineering was discussed.
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