The soft surrounding rock in tunnels has the characteristics of low strength. easy softening after soaking. and poor self-stability. which makes the inverted arch structure in soft rock tunnels prone to uplift deformations. https://www.lightemupsequences.com/flash-pick-Tiki-Luau-Shaped-Thank-You-Cards-Tropical-Hawaiian-Summer-Party-Thank-You-Note-Cards-with-Envelopes-Set-of-12-top-super