METHOD AND DEVICE FOR DRAINING OFF THE WATER SEEPED INTO A SOIL BENEATH HYDRAULIC STRUCTURES

摘要

A method and a device for draining off water seeped in a soil underlying a hydraulic structure (10), such as a canal, basin, dams and the like. A protective and waterproofing covering (13, 14), is laid down on the bottom wall (11) and side walls (12) of the hydraulic structure (10), by providing the covering (13, 14) with one-way gravity drainage valves (17). The waterproof covering (14) along the side walls (12), is anchored by a concrete ballast (18A) within a longitudinal trench (15), and by one or more tiltable concrete slabs (18) overlapping the waterproof covering (14), in which the slab or slabs (18) downwards extend from the anchoring ballast (18A). The water seeped in the soil, having a level higher than that of the water in the hydraulic structure, flows off by gravity towards the one-way valves (17), along an interface between the waterproof geomembrane (14) and the soil, slightly raising the tiltable concrete slab or slabs (18) by pressure of the same water seeped into the soil, having a level greater than the level of the water into the hydraulic structure (10).