3.2 Optimering av förstärkningsbehov

3.2 Design of rock support according to Eurokod using reliability-based design methods

 

Major parts:

 

• Senior project aiming to learn which rock mechanical problems that are the most suitable for reliability based design

• PhD project: Develop applicable methods for design of rock reinforcement according to Eurokod 7 using reliability based methods

 

Design of rock tunnels and rock caverns will since 2009 be carried out according to SS-EN 1997-1 in combination with SS-EN 1990. The basis is that every single design/load case will be verified to such an extent that no relevant limit state will be reached. According to SS-EN 19901-1 limit states have to be verified by one or a combination of methods, where one of the available methods is reliability based methods. Because of the large uncertainties in geotechnical and rock mechanical design, and the fact that limit states are complex and based on integration of rock reinforcement and rock mass, design methods based on reliability-based methods are often welcome. Guidelines for how to use reliability based design according to Eurokod 7 is however missing in the building industry, and hence there is a need for research aiming to clarify in which design/load cases reliability based design methods are useful and how to carry out the design according to this.

 

The TRUST 3.2 project consists of two sub projects - a Sr research project aiming to define for which design cases reliability-based design methods are suitable, and a PhD project aiming to develop applicable methods for design of rock support according to Eurokod 7.

 

The researchers share their time between the industry and KTH.

Total budget: 5 mill SEK

 

 

 

 

 

Vision

 

To develop methods that will support an optimal design of rock support in tunnel construction focusing on safety and total cost.

Team

 

Fredrik Johansson - contact

Bitr. Lektor, Jord- och Bergmekanik, KTH

Håkan Stille

Professor Emeritus, Jord och Bergmekanik, KTH

Stefan Larsson

Professor, Jord och Bergmekanik, KTH

William Bjureland

Doktorand, Jord och Bergmekanik, KTH

Aims

 

•Identify which rock mechanical properties that are best suited for reliability based design methods

•Develop practically applicable reliability based methods for design of rock support according to Eurocode

 

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

 

Lars-Olof Dahlström, NCC/Chalmers

Tommy Ellison, BESAB

Mats Holmberg, Tunnel Engineering

Fredrik Johansson, KTH

Stefan Larsson, KTH

Isabelle Olofsson, SKB

Jonny Sjöberg, Itasca/LTU

Håkan Stille, KTH

Robert Sturk, Skanska

Per Tengborg, BEFO

 

Funding