  In the framework of topcolor-assisted technicolor(TC2) model, there exist
tree-level flavor-changing (FC) couplings which can result in the loop-level FC
coupling $tcg$. Such $tcg$ coupling can contribute significant clues at the
forthcoming Large Hadron Collider (LHC) experiments. In this paper, based on
the TC2 model, we study some single t-quark production processes involving
$tcg$ coupling at the Tevatron and LHC: $pp(p\bar{p})\to t\bar{q}(q=u,d,s),tg$.
We calculate the cross sections of these processes. The results show that the
cross sections at the Tevatron are too small to observe the signal, but at the
LHC it can reach a few pb. With the high luminosity, the LHC has considerable
capability to find the single t-quark signal produced via some FC processes
involving coupling $tcg$. On the other hand, these processes can also provide
some valuable information of the coupling $tcg$ with detailed study of the
processes and furthermore provide the reliable evidence to test the TC2 model.
