Table 2 presents the results of twenty-five specimens were
tested according to the methodology and experiment design
outlined above. Water penetrates vertically downward
through seepage pathways in the site which is within the
groundwater recharge zone. All tested samples were penetrated
centrally to a depth of 0.5 cm to simulate a point of
weakness through which the water permeates preferentially.
The thicknesses of sample (not include the hole
length) in Table 2 are 1, 1.5, 2, 2.5, 4.5 cm. The initial
water head was 2 m, increasing at 0.5 m intervals until
subsequent soil failure and each water level was maintained
for 4 h as water seep through the sample in 2 h with
water head 2 m. The infiltration volume, particle precipitation
and variation of the water head was recorded every
hour. When one or more of the critical phenomena was
observed, such as water turbidity (Fig. 7) or soil damage
(Fig. 8) the test was stopped.
The anti-permeability strength lies between the pressure
at which soil damage occurs and the immediately preceding
pressure before failure. Statistically, the anti-permeability
strength is calculated as the average of two
pressures, calculated from the water head. The water head
is converted from height to pressure by P = qgh, where
g = 9.81 m/s2.
Table 2 presents the results of twenty-five specimens weretested according to the methodology and experiment designoutlined above. Water penetrates vertically downwardthrough seepage pathways in the site which is within thegroundwater recharge zone. All tested samples were penetratedcentrally to a depth of 0.5 cm to simulate a point ofweakness through which the water permeates preferentially.The thicknesses of sample (not include the holelength) in Table 2 are 1, 1.5, 2, 2.5, 4.5 cm. The initialwater head was 2 m, increasing at 0.5 m intervals untilsubsequent soil failure and each water level was maintainedfor 4 h as water seep through the sample in 2 h withwater head 2 m. The infiltration volume, particle precipitationand variation of the water head was recorded everyhour. When one or more of the critical phenomena wasobserved, such as water turbidity (Fig. 7) or soil damage(Fig. 8) the test was stopped.The anti-permeability strength lies between the pressureat which soil damage occurs and the immediately precedingpressure before failure. Statistically, the anti-permeabilitystrength is calculated as the average of twopressures, calculated from the water head. The water headis converted from height to pressure by P = qgh, whereg = 9.81 m/s2.
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