Restoration and reinforcement of a scarp

摘要

The method for the restoration and reinforcement of scarps and a resulting reinforced structure is provided. The method includes of clearing the scarp surface under restoration, and of creating a pit (an excavation). The bottom of the pit is filled with mineral soil and is compacted as a foundation of a retaining wall. A protective filter made from draining mineral soil is installed on the foothill of the scarp, where the protective filter is surrounded by draining geotextile. The geogrid is placed on the surface of the regressed scarp and then anchored to the soil of the scarp by tensile ropes. A rigid support, such as a crib (grillage), is created on the protective filter and batter piles are driven under the rigid support. Then the retaining wall is constructed, consisting of layers of compacted soil that are surrounded by draining geotextile. The retaining wall is covered by erosion control mats, anchored to the draining geotextile of the soil layers of the retaining wall. Protrusion in the scarp is covered with large granite boulders or concrete elements.

主权项

1. A method for restoration and reinforcement of a scarp comprising a surface, a front edge, a foothill, and a firm soil layer, said method comprising the steps of:
a) preparation of the surface of the scarp by removing weathered soil; b) creating a pit below the foothill and filling the pit with a layer of mineral soil with coarse-grain granulometric composition, and compacting the mineral soil to the subsoil to form a foundation for a retaining wall, with a minimum downward gradient of two percent away from the scarp; c) creating a horizontal protective filter at the foothill and being formed of compacted draining mineral soil and surrounded by pre-tensioned draining geotextile, wherein the horizontal protective filter comprises soil sections with different seepage coefficients and the soil sections of different seepage coefficients being separated from one another by a pre-tensioned geotextile; d) installing a geogrid of inert material on the surface of the scarp and anchoring the geogrid to the firm soil layer of the scarp with tensile ropes; e) installing a draining geotextile under the geogrid; f) creating a rigid support on top of the horizontal protective filter; g) sinking batter piles under the rigid support and intersecting the piles at a horizontal line parallel to the front edge of the scarp and at a vertical plane running through a center of gravity of the rigid support to act on pull and pressure, and supporting the piles on firm soil layer in the subsoil; h) creating a retaining wall containing multiple layers filled with compacted mineral soil surrounded by pre-tensioned geotextile, wherein each soil layer is formed of an internal, an external and at least one middle soil layer section with different granulometric compositions, and the external and the internal soil layer sections of the retaining wall being formed of draining mineral soil and constituting vertical protective filters of restored scarp, and the middle sections of the retaining wall being formed of fine-grain soil; i) covering the retaining wall with erosion control mats secured to the geotextile surrounding the mineral soil layers of the retaining wall with clamps of inert material; and j) creating a support for the retaining wall at the foothill of the scarp by installing a counterweight.