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.
• 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.
To create better fundamental conditions for improved design of rock tunnels than today, in a long term perspective.
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
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.
Per Tengborg, BeFo
Susanna Andrén, SKB
Tommy Ellisson, BESAB
Ulf Håkansson, SKANSKA
Henrik Jonsson, Vattenfall
Svensk kärnbränslehantering AB (SKB)
Stiftelsen Bergteknisk Forskning (BeFo)
NCC Construction AB
Sveriges geologiska undersökning (SGU)
CBI Betonginstitutet AB
Swerea KIMAB AB
Thomas Concrete Group AB
Sweco Environment AB