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2. Loose gravel deposit: mixed with laterite; 3 to 10 cm in diameter;
round.
3. Hard clay: brown; clayey material; 2 to 3 m in thickness; sloping; weak
plane with dip angle of 30
8
to 35
8
east; strike of the weak plane is
E.
4. Dense gravel deposit: mixed with soil with low plasticity; round to
subround; gravel size is larger than that in loose gravel deposit.
approximately N30
8
toward
east, was first identified at the site during the slope failure in 1995. The weak
plane was considered a dip slope for most of the reinforced slope. The
groundwater level at the slope area is approximately 55 m to 60 m below the
ground surface based on the boring results.
The hard clay, forming a weak plane with slope angle of 30
8
to 35
8
5 DYNAMIC SIMULATION OF THE REINFORCED SLOPE
Dynamic simulation of the reinforced slope subjected to seismic forces is
conducted to better understand the process of the failure. The computer program
PLAXIS (Plaxis, 1998), which is based on the finite-element method, is used for
the dynamic simulation of the reinforced slope during the earthquake. The time
history of acceleration, shown in
Fig. 5
,
recorded at the Nan-Kuan elementary
school in Pu-Li during the Chi-Chi earthquake is used for the seismic source in
Figure 7
Finite-element mesh for dynamic simulation of the reinforced slope during the
1999 Chi-Chi earthquake (Remark: The arrow symbol shown on the bottom of the mesh is
the source of the seismic force).
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