Environmental Engineering Reference
In-Depth Information
(a)
(b)
(c)
Figure 3.21.
Waco Dam, pore pressure plots and cross section through embankment as rebuilt. (a) pore
pressures prior to slide; (b) pore pressures after reconstruction; (c) embankment as recon-
structed (Stroman et al., 1984).
near Sydney, a trial road pavement built using ripped and trafficked shale has performed
satisfactorilly for 20 years (Won, 1985). The shale is weak to medium strong. Re-
sampling and testing of the material showed that there had been little breakdown in
service.
Siltstones in the medium strong to very strong range have been used successfully as
rockfill for some years. Near the site of Sugarloaf Dam excavation of test pits into 100
year old tunnel spoil dumps comprising such materials, showed that slaking had not
occurred in the rock below the near-surface two metres, i.e. in a near constant humidity
environment.
To the knowledge of the authors no mudrocks have been used successfully as rip-rap.
We would not expect it.
Random fills, earthfills and cores for embankment dams have been built successfully
using mudrocks in various conditions ranging from fresh to extremely weathered
(Vaughan 1994).
3.5.8
Mudrocks - check list of questions
- Slaking or disintegration on exposure?
- Swelling on exposure?
-Valley bulging?
- Soluble minerals in beds or veins?
-Presence of sulphide minerals?
- Slickensided fissures?
-Progressive shear failure?
- Bedding surface faults or shears?
 
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