  Results of a search for decays of massive particles to fully hadronic final
states are presented. This search uses 20.3 fb$^{-1}$ of data collected by the
ATLAS detector in $\sqrt{s} = 8$ TeV proton--proton collisions at the LHC.
Signatures based on high jet multiplicities without requirements on the missing
transverse momentum are used to search for $R$-parity-violating supersymmetric
gluino pair production with subsequent decays to quarks. The analysis is
performed using a requirement on the number of jets, in combination with
separate requirements on the number of $b$-tagged jets, as well as a
topological observable formed from the scalar sum of the mass values of
large-radius jets in the event. Results are interpreted in the context of all
possible branching ratios of direct gluino decays to various quark flavors. No
significant deviation is observed from the expected Standard Model backgrounds
estimated using jet-counting as well as data-driven templates of the
total-jet-mass spectra. Gluino pair decays to ten or more quarks via
intermediate neutralinos are excluded for a gluino with mass $m_{\tilde{g}} <
1$ TeV for a neutralino mass $m_{\tilde{\chi}^0_1} = 500$ GeV. Direct gluino
decays to six quarks are excluded for $m_{\tilde{g}} < 917$ GeV for
light-flavor final states, and results for various flavor hypotheses are
presented.
