| 摘要 |
<p>The barrier (2) comprises sheet steel elements pile-driven into an aquifer (3). The elements form two walls (24, 28) side by side. The elements are sealed to each other whereby each wall is leakproof. The space between the walls is divided into compartments (9). Each compartment can be monitored for water level, presence of leaked-in contaminants, etc. The walls are wide (30 cm or more) apart, to prevent leakage through gaps underneath the barrier. The compartments (9) are of large area (3000 sq cm or more), to ensure that no blockages are present in the compartment, which could give a false impression that the barrier was leakproof.</p> |
