Metamaterials are extensively utilized to manipulate ground surface waves for vibration isolation within the bandgap frequency ranges whereas topological crystals allow the creation of robust edge states immune to scattering by defects. In this work, we propose a topological surface wave metamaterial working in the Hertz frequency range, constituted of triangle shape concrete pillars arranged in a honeycomb lattice and deposited on the soil ground. Based on the analogue of quantum valley Hall effect, a non-trivial bandgap is formed from the degeneracy lifting of the Dirac cone at the K point of the Brillouin zone by breaking the inversion symmetry of the two pillars in each unit cell. A topological interface is created between two different crystal phases and a topological edge state based on surface acoustic wave propagation is demonstrated. The robustness of the topologically protected edge state is quantitatively analyzed in presence of various defects and disorders. Finally, we take advantage of the robust and compact topological edge state for designing a harvesting energy device. The results demonstrate the functionality of the proposed structure for both robust 2 surface vibration reduction as well as energy harvesting by designing proper topological waveguides.
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