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Proteção contra fluxos de detritos - Galerie Maachi - BLS 2017

The UX160-H4 debris flow system is filled following installation. In the picture, the ROCCO®-ring net R16/3/300 can be seen together with the secondary mesh TECCO® G65/3 used for the pre-filled application. The bottom slab, the lateral rock and the lateral shotcrete finish (not visible) are durably effective against the regressive erosion. The stability of the gallery is thus cost-effectively ensured.

Proteção contra fluxos de detritos - Galerie Maachi - BLS 2017

The gallery after the two floods and before installation of any protection measures. The regressive erosion endangers the BLS gallery due to the waterfall (photo source: Geoplan AG).

Proteção contra fluxos de detritos - Galerie Maachi - BLS 2017

The Maachi catchment area is between 10 and 15 km². With the Wiwannihorn it extends up to 3001 m above sea-level (picture source: modified according to swisstopo).

Proteção contra fluxos de detritos - Galerie Maachi - BLS 2017

Detailed view of the erosion gully before the measures. The drainage shaft clearly shows the original height of the terrain (photo source: Geoplan AG)

Proteção contra fluxos de detritos - Galerie Maachi - BLS 2017

The gallery prior to the measures. The edge of the erosion is hardly 2 metres away from the gallery wall.

Proteção contra fluxos de detritos - Galerie Maachi - BLS 2017

The UX160-H4 debris flow protection net. All brake rings are installed on the valley side, so they can function in case of future incidents. During overflow tests in the Illgraben (VS), it was demonstrated that no direct pressure shock acts on the net. Only the weight and the shear forces of the overflowing debris flow act upon the net. Thus it is not considered likely that the brakes will undergo major stresses.

Proteção contra fluxos de detritos - Galerie Maachi - BLS 2017

The system was filled as planned. In order that the filling material (diameter >= 10 cm) is not flushed out of the net (ring diameter 30 cm), a secondary mesh (TECCO® G65/3) was utilised.

Proteção contra fluxos de detritos - Galerie Maachi - BLS 2017

Detailed view of the spiral cable anchor: The vertical cables are guided through the loops of the spiral cable anchor.

Proteção contra fluxos de detritos - Galerie Maachi - BLS 2017

In order to avoid lateral erosion, the loose rock side was braced. The support cables are secured for future events by abrasion protection - even if the landslide net was back-filled during the construction phase.

 

Sistemas

 

Comprimento do sistema

15 m - 15 m

 

Ano de instalação

2017

Situação inicial

After the flooding in July and August 2015 of the Maachi (a mountain torrent in the Canton of Valais under the mountain Wiwannihorn in the municipalities of Ausserberg and Raron), considerable damage from erosion occurred on the valley side of the avalanche gallery of the BLS Southern Ramp (Bern-Lötschberg-Simplon railway line).

Until now, the mountain torrent Maachi had been lead through pipes under the gallery and through the erosion slope. However, the existing inlet already clogged up even with a small amount of debris. Alternatives were therefore sought.

Descrição

The office of Geoplan AG, Steg, VS was commissioned by the BLS AG to draw up immediate measures for securing the erosion slope and also the gallery.

The best option provides for the following:

During normal water level, the Maachi torrent will continue to flow down the existing inlet shaft of the Maachi pipe system. As a result, the erosion slope is not affected.

In case of flooding with debris or debris flow, the water will in future be intentionally fed over the gallery. This generates a sort of waterfall with a greater drop onto the erosion slope. This creates regressive erosion problems.

  • On the mountain-side of the crater (water-filled hollow), the slope is secured by a nailed-up supporting wall.
  • On the valley side of the waterfall impact, a debris flow net is installed and pre-filled.

The nailed-up supporting wall and the UX160-H4 debris flow system stops the regressive erosion. The solution is at the same time inexpensive.

Promotor

BLS AG

Contratante

SILEX Felstechnik AG

Objecto protegido

Caminho de ferro

Proteção contra a corrosão

GEOBRUGG SUPERCOATING

Empreteiro

Alp Bauingenieure AG

Outras empresas envolvidas

Geoplan AG

O seu contacto local

Roger Moor
   

Roger Moor

Country Manager Ost- und Zentralschweiz, Liechtenstein

Riscos naturais
Engenharia Hidráulica
Mineração / Túneis
Geobrugg AG,Aachstrasse 11,8590 Romanshorn / Suíça Country Manager Ost- und Zentralschweiz, Liechtenstein

E-mail

René Müller
   

René Müller

Country Manager Kantone AG BE BL BS FR GE JU NE SO VD VS

Riscos naturais
Engenharia Hidráulica
Mineração / Túneis
Geobrugg AG,Industriestrasse 21,5200 Brugg / Suíça Country Manager Kantone AG BE BL BS FR GE JU NE SO VD VS

E-mail

Alexander Bittendorfer
   

Alexander Bittendorfer

Project Manager Inspection Services

Riscos naturais
Geobrugg AG,Aachstrasse 11,8590 Romanshorn / Suíça Project Manager Inspection Services

E-mail

Isacco Toffoletto
   

Isacco Toffoletto

Ticino Country Manager

Riscos naturais
Engenharia Hidráulica
Mineração / Túneis
Geobrugg AG Ticino,Stabile Cometal, via Pizzante 7,6595 Riazzino / Suíça Ticino Country Manager

E-mail