  We construct a one-parametric family of the double-scaling limits in the
hermitian matrix model $\Phi^6$ for 2D quantum gravity. The known limit of
Bresin, Marinari and Parisi belongs to this family. The family is represented
by the Gurevich-Pitaevskii solution of the Korteveg-de Vries equation which
describes the onset of nondissipative shock waves in media with small
dispersion. Numerical simulation of the universal Gurevich-Pitaevskii solution
is made.
