Civil Engineering Reference
In-Depth Information
Figure 6.22
Piezometric head distribution acting on a rock block located in a rock slope
The force resulting from the dynamic pressure component is denoted as the“seepage
force” {F
S
} and the force resulting from the hydrostatic pressure component is called
the “uplift force” or “hydrostatic uplift” {F
U
} (Wittke 1990):
{F
S
} =
γ
w
· {I} · V,
(6.79)
{F
U
} =
γ
w
· {e
z
} · V,
(6.80)
where V is the volume of the rock block and is the unit vector in the z direction,
which is oriented opposite to gravity (cf. Fig. 6.22). The direction of {F
S
} coincides with
the direction of the hydraulic gradient {I}, while {F
U
} is oriented opposite to gravity.
The three-dimensional hydrostatic uplift and seepage force acting on a rock mass block
bounded by six discontinuities of three discontinuity sets are illustrated in Fig. 6.24.
Search WWH ::
Custom Search