Civil Engineering Reference
In-Depth Information
(11.10)
Figure 11.6
Two-dimensional rock wedge supported by one discontinuity loaded by self-weight and
water pressure
Figure 11.7 shows the forces acting on a two-dimensional rock wedge that is supported
by one discontinuity D and loaded by self-weight, water pressure and an external force
P. P may include surface loads such as traffi c loads, external water loads not acting on
the sliding surface and earthquake loads. The stability of the wedge against sliding is
then assessed by the following utilization factor:
(11.11)
where P
N
and P
T
are the components of P acting normal and parallel to D (Fig.
11.7). Since sliding on D can occur both downwards and upwards and (11.11) must
be positive, the absolute value of the force components parallel to D needs to be
determined for safety assessment. Upwards sliding can occur if PT
T
is larger than
and directed opposite to GT.
T
.
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