Stabilisation of excavation slopes along the A1 Motorway

Project Type

Geotechnics and Pre-Stressing

Construction Company

Tecnovia

Location

A1 Motoway – São João da Talha, Alverca, Mainland Portugal

Description

Carried out for Brisa in 2017, the project for the stabilisation of the excavation slopes at km 7+200 (N/S) and 12 +250 (S/N) along the São João da Talha / Sta Iria da Azóia / Alverca subsections of the A1 Motorway, included the following work:

Km7+200 (N/S)

Demolition of the reinforced concrete and slope re-profiling, as the latter was showing signs of wasting and collapse.

Placement of 32 mm diameter pins, distributed length- and height-wise over the entire surface of the slope.

Installation of geodrains at two levels up the slope.

Waterproofing of the entire slope using a 15 cm thick layer of reinforced pigmented shotcrete, and installation of a new rainwater drainage system on the crest of the slope and the platform.

Km12+250(S/N)

Demolition of the existing shotcrete and slope re-profiling, as the latter was showing signs of waisting and collapse.

Construction of a buttressing wall in cyclopean concrete. Installation of a new rainwater drainage system on the crest of the embankment and the platform.

Installation of geodrains.

Wall surface finishing with pigmented roughcast.