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| Experimental research on model preparation of highly fractured rock mass based on 3D printing#br# |
| WANG Xiaoqing1，2，3，GAO Fuqiang1，2，3，LOU Jinfu1，2，3 |
(1. CCTEG Coal Mining Research Institute，Beijing 100013，China；2. Coal Mining Branch，China Coal Research Institute，Beijing 100013，China；3. State Key Laboratory of Coal Mining and Clean Utilization，
China Coal Research Institute，Beijing 100013，China) |
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Abstract In order to solve the problem of the physical model preparation of highly fractured rock mass，a preparation method for physical model of highly fractured rock mass based on 3D printing was proposed by systematically reviewing the existing 3D printing preparation methods for fractured rock mass. The soluble 3D printing materials were screened out through the dissolution test. The physical models of highly fractured rock mass contained a fracture network were prepared using the soluble 3D printing materials，and the mechanical properties of the highly fractured rock mass model were verified by uniaxial compression laboratory test and numerical simulation test. The results show that the proposed method can generate physical models of highly fractured rock mass with excellent performance by first printing the physical model of fracture network with soluble 3D printing materials，next pouring the mortar and curing，and then dissolving the fracture material with solvent. The modified PVA material has excellent solubility，which can dissolve quickly under the conditions of pouring mortar，and the dissolved material can be used as filler for fractures. The dissolved material can prevent the disintegration of the highly fractured rock mass model because of the cohesiveness. Therefore，the modified PVA material is suitable for preparing physical models of highly fractured rock mass. The preparation method of highly fractured rock mass based on 3D printing has two outstanding advantages. Compared with the direct preparation method by 3DP(three dimensional printing)，the physical models have good simulation performance because of the use of conventional mortar as the main material，which has adjustable properties. Compared with the indirect preparation method by FDM(fused deposition modelling)，the influence of fracture material on the mechanical properties of the physical model is eliminated by using soluble 3D printing materials to print the fracture network. The proposed method based on 3D printing can prepare physical models of highly fractured rock mass with conventional mortar as the main material and containing a fracture network, in which the width of the fracture can be as small as 0.4 mm and the fractures have weak cohesion. The physical models can be widely used for physical simulation experiments on highly fractured rock mass，thereby expanding the physical simulation capabilities of fractured rock mass to highly fractured rock mass.
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2023, Vol. 42 
