Description Usage Format Details Source References Examples
Samples of concrete used in the construction of an opencast tunnel are obtained and several properties are measured. Two boreholes of different depths are taken at the same 20 positions. This leads to two datasets.
1 |
Two data frames with 240 and 412 observations, respectively, on the following variables.
section
Section of the tunnel profile,
with levels d.1
and d.2
for decks 1 and 2, and
w.1
and w.2
for walls 1 and 2
diameter
Diameter of bore hole, 68mm for
d.tunnel1
and 50mm for d.tunnel2
n
Number of ...???
position
Position, factor with levels A
to V
layer
Layer, factor with levels
layer.1
: ...,
layer.2
: ...,
layer.3
: ...,
d.tunnel1
only contains the first 3 layers
strength
Compressive strength of the concrete [MPa]
density
Density []
perm.O2
Permeability for oxigen ???[m2]
(only d.tunnel1
)
cond.CL
???
(only d.tunnel1
)
pores.total
Pores [m2]
(only d.tunnel2
)
pores.air
Pores for air [m2]
(only d.tunnel2
)
pores.H2O
Pores for water [m2]
(only d.tunnel2
)
water
???
(only d.tunnel2
)
cond.H2O
???
(only d.tunnel2
)
The samples for the two datasets are bore kernels of 68 and 50 mm
diameter, respectively. The samples with the same
position
and layer
are taken near each other.
Leemann, A., Hoffmann, C., Malioka, V. and Faber, M. (2006). Variability of concrete properties in structures, Technical Report 611, Bundesamt f\:ur Strassen (ASTRA), Bern, Switzerland.
Stahel, W.A., Moro F. and Luco, L.F. (2015). “Statistical Procedures for Performance-based Specification and Testing”. In:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | data(d.tunnel1)
showd(d.tunnel1)
data(d.tunnel2)
showd(d.tunnel2)
## merge
d.tunnel <- merge(d.tunnel1, d.tunnel2,
by=c("section","position","layer"), all.x=TRUE,
suffixes=c(".68",".50"))
## compare densities in neighboring boreholes
plot(density.50~density.68,d.tunnel)
## regression model to explain permeability
r.lm <- lm(log10(pmax(1e-11,perm.O2))~log10(pmax(cond.CL,0.5))+
density.68+section, data=d.tunnel)
summary(r.lm)
plot(r.lm)
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