  A search is presented for particles that decay producing a large jet
multiplicity and invisible particles. The event selection applies a veto on the
presence of isolated electrons or muons and additional requirements on the
number of b-tagged jets and the scalar sum of masses of large-radius jets.
Having explored the full ATLAS 2015-2016 dataset of LHC proton-proton
collisions at $\sqrt{s}=13~\mathrm{TeV}$, which corresponds to 36.1 fb$^{-1}$
of integrated luminosity, no evidence is found for physics beyond the Standard
Model. The results are interpreted in the context of simplified models inspired
by R-parity-conserving and R-parity-violating supersymmetry, where gluinos are
pair-produced. More generic models within the phenomenological minimal
supersymmetric Standard Model are also considered.
