  In this paper, a novel hybrid FEM and Peridynamic modeling approach proposed
in Ni et al. (2020) is used to predict the dynamic solution of hydro-mechanical
coupled problems. A modified staggered solution algorithm is adopted to solve
the coupled system. A one-dimensional dynamic consolidation problem is solved
first to validate the hybrid modeling approach, and both -convergence and
-convergence studies are carried out to determine appropriate discretization
parameters for the hybrid model. Thereafter, dynamic fracturing in a
rectangular dry/fully saturated structure with a central initial crack is
simulated both under mechanical loading and fluid-driven conditions. In the
mechanical loading fracture case, fixed surface pressure is applied on the
upper and lower surfaces of the initial crack near the central position to
force its opening. In the fluid-driven fracture case, the fluid injection is
operated at the centre of the initial crack with a fixed rate. Under the action
of the applied external force and fluid injection, forerunning fracture
behavior is observed both in the dry and saturated conditions.
