This paper is devoted to the initial-boundary value problem for the
time-fractional analogues of Korteweg-de Vries-Benjamin-Bona-Mahony-Burgers,
Rosenau-Kortweg-de Vries-Benjamin-Bona-Mahony-Burgers, Ostrovsky and
time-fractional modified Korteweg-de Vries-Burgers equations on a bounded
domain. Sufficient conditions of the blow-up of global solutions in finite time
of above equations are considered. We also study the maximum principle and
influence of gradient non-linearity on the global solvability of
initial-boundary value problems for the time-fractional Burgers equation. In
closing, we provide the some exact examples. The proof of the results is based
on the Mitidieri-Pohozhaev nonlinear capacity method.