Geoscience Reference
In-Depth Information
In the United States, seismic design of municipal solid waste containment
systems became mandatory in 1993 as regulated by the Resource Conservation
and Recovery Act Subtitle D. The seismic impact zone, which is defined as an
area having a 10% or larger probability that the peak acceleration in lithified earth
material will exceed 0.1 g in 250 years, has to be designed against earthquake
loading. Figure 9 gives the seismic map typically used for landfill design.
Richardson et al. (1995) and Anderson and Kavazanjian (1995) describe in detail
the seismic design of landfill.
In this session, the Koerner-Hwu approach is extended to include seismic
loading. The approach assumes limit equilibrium analysis for a cover, which is of
length and thickness L and H, respectively. These formulations are based on a
two-part wedge mechanism with the interwedge force acting parallel to the slope
angle, b ( Fig. 10) . The earthquake inertia force is considered using horizontal and
vertical seismic coefficients, k h and k v , respectively. Note that the positive
vertical acceleration is assumed to act upward. The geometry of landfill cover is
referred to Fig. 10.
The factor of safety of
the cover soil
to resist direct sliding is
determined as
T A þ
P
þ
k v W A sin b
þ
C a
F ds ¼
ð
19
Þ
W A ð
k h cos b
þ
sin b
Þ
Figure 9 EPA seismic map. (From Sharma and Lewis, 1994.)
Search WWH ::




Custom Search