Written question asked by Cheryl Gillan (Conservative) on Tuesday, 3 July 2018, in the House of Commons. It was due for an answer on Friday, 6 July 2018 (named day). It was answered by Nusrat Ghani (Conservative) on Friday, 6 July 2018 on behalf of the Department for Transport.
High Speed 2 Line: Chilterns
- Question
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To ask the Secretary of State for Transport, whether the tunnelling of High Speed Two under the Chilterns is planned to involve Bentonite under pressure.
- Answer
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The operation of the Chiltern tunnel Tunnel Boring Machine will not use bentonite. As HS2 Ltd have always made clear, they will not begin works in the area until the Environment Agency is satisfied with their final approach.
However, it is currently proposed that Bentonite will be used in the construction of the diaphragm walls for the 5 intermediate shafts. Prior to the use of bentonite in these locations the construction methodology dictates that the ground surrounding the diaphragm walls will be grouted, therefore sealing and protecting the ground water from the bentonite.
Secondary information
- Type
- Written question
- Reference
- 160054
- Session
- 2017-19
- Related items
- Subjects
- Construction Tunnels High Speed 2 line Chilterns Clay
- Link
- View this Written question on www.parliament.uk
Librarians' tools
- Timestamp
- 2025-02-21 15:16:32 +0000
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- http://data.parliament.uk/writtenparliamentaryquestion/commons/2017-19/160054
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