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into it through an infiltration tube. The water saturates the sand as it rises. Calculate
the ultimate position of the phreatic level. How thick should the top impermeable
clay cover be to resist the final gas pressure?
Unit weight of sand core
= 19.5 kN/m
3
, initial water content of sand core
w
0
=
15%, unit weight of sand solids
s
= 26.5 kN/m
3
, unit weight of clay shell
= 18
kN/m
3
, width resp. height of sand core 10m, 5m, amount of water entering the core
1m
3
/ m.
Hint: Calculate dry porosity, initial degree of saturation, initial free porosity,
volume necessary to accommodate incoming water. Initial gas pressure = 100 kPa.
Use Boyle's gas law.
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