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Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Lenk, Bernese Alps 2017

The custom designed debris flow barrier based on Geobrugg's technology of flexible barriers

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Lenk, Bernese Alps 2017

Flood from 1930 - the village of Lenk in the Bernese alps was completely under water. Afterdebris flows, the Simme river bed was blocked and the village remained flooded for several weeks

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Lenk, Bernese Alps 2017

Overview of the debris flow accumulation area above the village

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Lenk, Bernese Alps 2017

Accumulation area and the barrier localization (red). Source: swisstopo, 2017

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Lenk, Bernese Alps 2017

Concrete pillars foundation during installation - visible huge scale of the project

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Lenk, Bernese Alps 2017

Another view of the concrete pillars foundation during installation - totally ca. 130 m³ of concrete were used. The stream water was by-passed using a temporary piping (black pipe visible on the left)

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Lenk, Bernese Alps 2017

Concrete pillars foundation during installation - view from the top. Walls of the deep cut are stabilized with anchored retaining walls

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Lenk, Bernese Alps 2017

View of the almost finished riverbed barrier with rock blocks covering the winglet area of the barrier. That solution perfectly covers heavy concrete foundations and prevents erosion during the event

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Lenk, Bernese Alps 2017

To provide extra protection for the concrete pillars, they are covered with tree trunks (easy and cheap in maintenance) Also visible Geobrugg's brake rings, which absorb a large part of the impact energy.

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Lenk, Bernese Alps 2017

Side view of this exceptional protective ringnet installation in the Bernese Alps.

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Lenk, Bernese Alps 2017

Overview towards the valley - people standing on the right show the enormous size of the barrier equipped with Geobrugg's technology

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Lenk, Bernese Alps 2017

View from below the huge protective structure in the Bernese alps

 

Zastosowane systemy

Specjalne rozwiązania

 

Dlugosc systemu od

40 m - 40 m

 

Rok Instalacji / Montazu

2017

Sytuacja początkowa

The village of Lenk in Simmental valley (Bernese Oberland) was already affected by debris flows in the past. For example, mudflows in summer 1930 from side streams clogged the bed of the river Simme what caused a deluge in the village. Access to this mountain village - street and rail - was also blocked. During this large event, the quantity of debris flow was estimated as 135'000 m³.

Many other minor to medium events were observed in the following decades. After a flood in 2005 (with minor damage), the danger map was revised and the present project was launched.

The origin of the debris flow mobilization area is mainly a slump in the Bühlgraben as well as the strong gut erosion of the alluvial soils below it. The catchment area covers an area of ​​around 20 km². It is assumed that the debris flows occur in several discharges. The location of the barrier is at the end of a winding stream.

Based on a 3D debris modeling (RAMMS DEBRIS FLOW, carried out by Emch + Berger AG from Bern), the input parameters for the dimensioning flexible barriers were obtained. The final solution is dimensioned with a retaining capacity of 70'000 m³ (in four to five bays of 15'000 m³ each) and flow velocities up to 9 m/s.

Opis zastosowanego rozwiazania

To prevent medium size debris flows reach the riverbed of the Simme, a restraint system for sludge and driftwood was created in geologically very demanding terrain. The annual normal water discharge with smaller solid particles can easily pass through the basal opening.

Due to the required spans and the specified loads, a design with concrete slabs was chosen. For this purpose, Geobrugg dimensioned the nets and ropes between the concrete slabs (based on the Geobrugg standard barrier VX160-H6). The design of the concrete slabs was developed by Emch + Berger AG Bern.

The six foundations of the concrete slabs were securely deeply seated using 15 m deep reinforced pails.

Nevertheless, in the case of a major event, this retention volume could be exceeded. Then the remaining debris material passes via the overflow section in the middle of the barrier.

Inwestor

Community of Lenk

Wykonawca

Steiger Ingenieure + Planer AG

Chroniony Objekt

Road, Railway, Building, Touristic infrastructure, Residential area, Infrastructure, Other

Ochrona przeciwerozyjna

GEOBRUGG SUPERCOATING

Projektant

Emch+Berger AG Bern

Inne przedsiębiorstwa

Burn & Künzi AG

Osoba kontaktowa na miejscu

Kevin H. Coyle
 

Kevin H. Coyle

Regional Manager Northeast

Zagrożeniami naturalnymi
Nżynieria hydrauliczna
Geobrugg North America, LLC,3 Beaudet Terr,Columbia CT 06237 / USA Regional Manager Northeast

Formularz kontaktowy

Saleh Feidi
 

Saleh Feidi

Regional Manager California

Zagrożeniami naturalnymi
Nżynieria hydrauliczna
Geobrugg North America, LLC,8921 Emperor Ave.,San Gabriel, California 91775 / USA Regional Manager California

Formularz kontaktowy

John Kalejta
 

John Kalejta

Regional Manager Central US

Zagrożeniami naturalnymi
Nżynieria hydrauliczna
Geobrugg North America, LLC,3215 67th Avenue Pl,Greeley CO 80634 / USA Regional Manager Central US

Formularz kontaktowy

Bob Lyne
 

Bob Lyne

Regional Manager Southeast

Zagrożeniami naturalnymi
Nżynieria hydrauliczna
Geobrugg North America, LLC,8004 Windspray Drive,Summerfield NC 27358 / USA Regional Manager Southeast

Formularz kontaktowy

Pierce Runnels, Civil Engineer
   

Pierce Runnels

General Manager Geobrugg North America

Zagrożeniami naturalnymi
Geobrugg North America, LLC,22 Centro Algodones , Civil Engineer General Manager Geobrugg North America

Formularz kontaktowy

Tim Shevlin
 

Tim Shevlin

Sales Director

Zagrożeniami naturalnymi
Geobrugg North America, LLC,Salem OR 97302 / USA Sales Director

Formularz kontaktowy