| 摘要 |
A trench (18) is excavated from the top surface of an earthen dike (10), all the way down to the foundation below the base of the dike. Dry powder, partially hydrolyzed polyacrylamide (PHPA) is mixed with fresh water and soda ash in proportions of 20 pounds PHPA to 4 pounds soda ash to 68 barrels (2856 gallons) fresh water to form a slurry (40) having a funnel viscosity of at least 45 seconds/quart. As the trench is being excavated, the slurry is pumped into the trench immediately. A section of geo-membrane (20) having a thickness of 0.080 inch is placed in the trench all the way to the bottom of the trench, overlapping at the top of the membrane onto the top surface (11) of the dike. Dry sand (42) is then pumped into the trench to displace the slurry in the trench.
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