This preview shows page 1. Sign up to view the full content.
59
∫
+
=
=
=
m
z
z
dz
z
z
10
0
4000
5000
10
ρ
Let u = 5000 + 4000z
then z = (u – 5000)/4000 and dz = du/4000, and
()
4000
.
400
/
5000
45000
5000
du
u
u
∫
−
=
=
du
u
∫
⎟
⎠
⎞
⎜
⎝
⎛
−
45000
5000
16000
50
1600000
1
=
⎥
⎦
⎤
⎢
⎣
⎡
−
16000
)
ln(
.
50
1600000
45000
5000
u
u
(settlement in metres)
Thus
= (0.028 – 0.033) – (0.003 – 0.027) m = 0.019 m
or
ρ
= 19 mm
Q4.7 Figure 4.42 shows the ground conditions at the site of the Jubilee Line Extension station
at Canary Wharf, in East London. During construction of the station, it was necessary to
lower the groundwater level at the top of the Thanet Sands to 84m above site datum.
(a) Assuming that the groundwater level in the Thames Gravels is unaffected, and that the
groundwater level at the top of the Chalk is reduced by only 35kPa, construct a table for the
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 12/28/2011 for the course CHM 4302 taught by Professor Stuartchalk during the Fall '11 term at UNF.
 Fall '11
 StuartChalk
 Analytical Chemistry

Click to edit the document details