Reinforcement capabilities of a thin polymeric liner under flexural loading applied in hydrostone plaster beams
Publication Name
New Challenges in Rock Mechanics and Rock Engineering - Proceedings of the ISRM Rock Mechanics Symposium, EUROCK 2024
Abstract
Polymeric liners provide resistance to the shearing of exposed rock layers/ blocks of an excavation. Understanding the reinforcement mechanism of liner through laboratory experiments and numerical models is the key to measure its performance for field applications. A lined beam exhibited strain hardening behaviour under flexural load with an increased capacity as compared to an unlined beam showing tensile-brittle failure. The substrate material and the interface was then modelled numerically to understand the damage behaviour of the samples. The results showed that micro-cracks developed at the interface due to shearing and the growth of micro-cracks was restricted in lined sample. Plastic shear strain distribution in numerical models showed that the material started failing in shear from the supporting rollers. A distinct diagonal shear crack started to form between the loading and the support roller points, causing the ultimate failure. Cracks also propagated laterally along the interface as found during experiments.
Open Access Status
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First Page
1050
Last Page
1056