  We study the strong correlation effects in the vicinity of the Mott
metal-insulator transition using coupled clean or disordered Hubbard chains
with a infinitely large coordinate number $D_{\perp}\to\infty$ in the direction
perpendicular to the chains and with a long-range transverse hopping. Strong
electron correlation effects are treated partially non-perturbatively with the
use of the exact results for the 1D Hubbard model. In the case of clean
systems, the thermodynamic and transport quantities which characterize the Mott
transition from the Fermi liquid state, such as the specific heat coefficient,
the Drude weight, and the compressibility, are obtained as functions of
hole-doping $\delta=1-n$ ($n$, electron density) by the systematic expansion in
terms of the inverse of the transverse hopping range $l_{\perp}$. We find that
the $\delta$-dependence of these quantities shows non-universal behaviors with
exponents depending on the strength of electron-electron interaction. In the
presence of disorder, it is shown that the frequency-dependence of the
dynamical conductivity obeys the Mott's law, implying the possibility of {\it
Mott glass state} for $\delta \to 0$, provided that there exists a finite range
interaction.
