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San Francisco Tunnel Los Bronces Access Protection

Debris Flow & Shallow Landslide Protection - San Francisco Tunnel Los Bronces Access Protection 2018

South Portal, Line 1 (60 m SL150)

Debris Flow & Shallow Landslide Protection - San Francisco Tunnel Los Bronces Access Protection 2018

Engineering study

Debris Flow & Shallow Landslide Protection - San Francisco Tunnel Los Bronces Access Protection 2018

General view, South Sector

Debris Flow & Shallow Landslide Protection - San Francisco Tunnel Los Bronces Access Protection 2018

South Portal Line (60 m SL150)

Debris Flow & Shallow Landslide Protection - San Francisco Tunnel Los Bronces Access Protection 2018

South Portal line 2 (114 m SL150)

Debris Flow & Shallow Landslide Protection - San Francisco Tunnel Los Bronces Access Protection 2018

Work in progress, South Portal line 1

Debris Flow & Shallow Landslide Protection - San Francisco Tunnel Los Bronces Access Protection 2018

Work in progress, South Portal line 2

Debris Flow & Shallow Landslide Protection - San Francisco Tunnel Los Bronces Access Protection 2018

General view, north sector

Debris Flow & Shallow Landslide Protection - San Francisco Tunnel Los Bronces Access Protection 2018

First works North Portal

Debris Flow & Shallow Landslide Protection - San Francisco Tunnel Los Bronces Access Protection 2018

Work in progress, North Portal

Debris Flow & Shallow Landslide Protection - San Francisco Tunnel Los Bronces Access Protection 2018

North Portal barrier (66 m, SL150)

 

Systems

 

System length

- 240 m

 

Year of installation

2018

Initial situation

The San Francisco River is one of the main tributaries of the Mapocho River that crosses the city of Santiago. This river originates and passes the surroundings of the mining site Los Bronces de Anglo American, located in the middle of the Andes Mountain Range. Within its route, the river crosses a tunnel that makes a bypass through the old tailings pond of the mining site.

In summer, this sector is prone to rainfall, producing landslides that block the entrance and exit portals of the tunnel, affecting the riverbed and generating a significant environmental impact when it comes into contact with the tailings pond material.

Description

To protect the portals, a long-term plan has been designed. It begins with mitigation works for the landslides that occurred in the vicinity of the portal. For this purpose, an engineering project was initially developed to model the water flows in the streams and then implement a solution with multiple shallow landslide barriers protecting both portals of the tunnel. The barriers will avoid future environmental impacts due to the diversion of the river waters.

Customer

Anglo American - Los Bronces

Engineering

Geotest

Contractor

Pucará

Protected object

Mine / Quarry, Infrastructure, Other

Corrosion protection

GEOBRUGG SUPERCOATING

Your local contact

René Müller
   

René Müller

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

Natural Hazards
Hydraulic Engineering
Mining / Tunnels
Geobrugg AG,Industriestrasse 21,5200 Brugg / Switzerland Country Manager Kantone AG BE BL BS FR GE JU NE SO VD VS

E-Mail

Olivia Sartorius
   

Olivia Sartorius

Natural Hazards
Hydraulic Engineering
Mining / Tunnels
Geobrugg AG

E-Mail

Alexander Bittendorfer
   

Alexander Bittendorfer

Project Manager Inspection Services

Natural Hazards
Geobrugg AG,Trucks via road 14 or 13 only!, Aachstrasse 11,8590 Romanshorn / Switzerland Project Manager Inspection Services

E-Mail

Isacco Toffoletto
   

Isacco Toffoletto

Natural Hazards
Hydraulic Engineering
Mining / Tunnels
Geobrugg AG Ticino,Via Brusada 5,6933 Muzzano / Switzerland

E-Mail