Provision of Preliminary Civil Engineering Consultancy Services for FCC Study

Description of the Procurement: The required Services consist of, but are not limited to, the following activities:

1. Numerical analysis of subsurface structures such as caverns, pre-cast lined tunnels, and

shafts. Analysis to be carried out using the latest geotechnical data. Results to be presented

in a report, along with drawings, showing optimised geometries and material properties;

2. Assessment of the risk of TBM entrapment during excavation of the tunnels. Means of

reducing the entrapment risk through the specification of TBM requirements shall be

presented;

3. Technical feasibility of using a permanentshotcrete lining to replace the insitu concrete lining

of subsurface structures. Report to summarise the feasibility of permanent shotcrete lining

with benefits and risks presented;

4. Risks and mitigation measures arising from tunnelling through water bearing molasse

(faulted zones beneath watercourses). To include an assessment of the tunnel drainage

requirements, use of waterproof linings and drainage weep holes. Report to summarise

potential case studies, tunnelling methods, and application to the FCC project;

5. Feasibility of using a single TBM to drive through both molasse and limestone geology.

Report to cover TBM specifications, case studies where possible, and project requirements,

risks and benefits;

6. Risk and mitigation measures for tunnelling through karstic limestone with a TBM. Reporting

on case studies, TBM requirements, risks and mitigations;

7. Review of the FCC feasibility study construction schedule and associated costs. Analysis of

the existing cost and construction schedule and a report to present the analysis, findings and

recommendations;

8. Assessment of the interactions between the FCC tunnel and existing surface infrastructure

(for example highways, railways and bridges). Report to conclude assessment and

recommendations for risks and mitigation measures.

9. Desktop study of existing Swiss tunnelling projects through molasse geology. Report to

summarise a selection of case studies and to discuss the lessons learned from any difficulties

encountered during construction. Additional information: Please note that even after the ‘official’ stated deadline on the market survey has passed, the contract remains open until the Invitation to Tender is issued. A Market Survey is merely an expression of interest and does not in any way constitute a commitment to bid. If you are interested in this contract, we encourage you to submit the Pre-Qualification Questionnaire and you are welcome to later