Abstract
Reliable size-effect law for discontinuous rock mass is the premise of projection of the scale-down model test results to practical engineering applications. In this study, 3D printing technology is engaged to manufacture repeatable and scalable rock models in different scaling ratios. Compression tests show that the strength, modulus, and failure pattern will change with the variation of the model size. Currently derived fitting curves for the variable strength against different sizes for intact rock models are consistent to the prevailing size-effect models of natural rocks in open literature. But the influence of fractures on the size effect is underestimated in scale-down fractured rock models in the reported literature, resulting in the small discontinuous models showing overestimated strength and unreliable mechanical behaviour. The reliability of the current size effect for both the intact and fracture rock is attributed to the highly resolutive additive-subtract manufacturing procedure to produce repeatable and scalable samples to eliminate uncertainties.
Highlights
In this study, 3D printing technology is engaged to manufacture repeatable and scalable rock models in different scaling ratios.
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Acknowledgements
The authors wish to acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. U1965204, 52178198, 51627812).
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Wang, Y., Wang, L., Zhang, W. et al. Size Effect of Fractured Rock Mass Based on 3D Printed Model Testing. Rock Mech Rock Eng 55, 7005–7020 (2022). https://doi.org/10.1007/s00603-022-03013-4
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DOI: https://doi.org/10.1007/s00603-022-03013-4