Certain general rules about the effect of impact angle on coefficients of restitution in rockfall simulation hold regardless of the laboratory test scales and conditions. Increasing impact angle will induce reductions in
Rn and
RE, whereas it will have a trivial impact on
Rt. A small impact angle will likely cause the rebound angle to exceed the impact angle, which usually causes a higher
Rn and lower
RE. This leads to extreme scatter results of restitution and hinders the trajectory prediction.
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