2.4 Framtagning av funktionsanpassade kriterier för grundvattenpåverkan vid underjordisk infrastruktur i urban miljö

2.4 Development of functionality based criteria for the groundwater chemical environment in underground infrastructure projects

 

Underground infrastructure facilities affects the surrounding environment. Primarily the hydrological conditions are changed, but also the groundwater chemistry is affected due to interactions between the facility and the surrounding rock. In order to minimize the effects properties of the construction material should be taken care of already in the design phase. Examples of such properties are functionality of the material, the interaction between the material and the groundwater and the durability of the chosen material. All three factors are highly affected by the underground environment, where the groundwater is acting as the media transporting what is introduced to the underground to the underground.

 

Construction material is often cement based or a combination by concrete and steel, such as shotcrete. Rock bolts are most often made of steel. In a number of work packages within the project hydrochemical expertise will be used for studying the effect on both cement based construction material and the corrosion process on steel rock bolts.

 

The overall aim is to further develop standards aiming to fulfill the design criteria on underground facilities with respect to the groundwater chemical environment. The project results also aims to be used for safer tunnel design and a more cost efficient long term maintenance of tunnels.

 

The project is a collaboration between a large number of partners: Chalmers, Swerea KIMAB, CBI, NCC, SGU, Sweco, and Nova R&D.

 

 

Work Packages:

 

• Desk and literature study to define State of the art in the field. Use of water chemical databases at SGU (Swedish Geological Survey) and TRV (Swedish Road Administration).

• Hydrocehmical numerical modelling in order to predict water chemical changes caused by geological conditions

• Study of different shotcretes – how do they react on different groundwater chemical changes

• Laboratory leaching tests on concrete. Different water chemistry and temperature effects will be studied.

• Corrosion tests on rock bolts in laboratory

• Field study on rock bolt quality in existing tunnels

The different work packages will produce their own reports, which in the end will be incorporated in a final total final report.

 

 

 

 

Vision

 

To create better fundamental conditions for improved design of rock tunnels than today, in a long term perspective.

Team

 

Fredrik Mossmark - contact Chalmers/Sweco

Johan Ahlström, Swerea KIMAB

Lars-Olof Dahlström, Chalmers/NCC

Lars O Ericsson, Chalmers

Leif Fjällberg, CBI Betonginstituet

Mariusz Kalinowski, CBI Betonginstituet

Lars-Ove Lång, Chalmers/SGU

Frédéric Mathurin, Nova

Urs Mueller, CBI Betonginstituet

Malin Norin, Chalmers/NCC

Bror Sederholm, Swerea KIMAB

Anders Selander, CBI Betonginstitutet

Jan Trädgårdh, CBI Betonginstituet

 

Aims

To further improve standards concerning functional demands on underground infrastructure facilities, governed by the chemical effects induced by the change of the groundwater properties during construction. An effect will be safer and more cost efficient maintenance of the tunnels.

W H E R E I N D U S T R Y M E E T S A C A D E M I A

Reference Group

 

Per Tengborg, BeFo

Susanna Andrén, SKB

Tommy Ellisson, BESAB

Ulf Håkansson, SKANSKA

Henrik Jonsson, Vattenfall

Funding

 

FORMAS

SBUF

Cementa AB

Svensk kärnbränslehantering AB (SKB)

Stiftelsen Bergteknisk Forskning (BeFo)

Energiforsk AB

NCC Construction AB

Nova FoU

Besab

Trafikverket

Sveriges geologiska undersökning (SGU)

CBI Betonginstitutet AB

Swerea KIMAB AB

Thomas Concrete Group AB

Sweco Environment AB