摘要: The Heathrow Express project will provide a high speed rail link into Airport, and includes two stations to be constructed at the airport in bored tunnels. paper describes NATM trial tunnel built as part of project. first section gives principle reasons for choice construction tunnel. It details design extensive instrumentation installed. methods durations main activities are described discussed. second concentrates on information available from ground monitoring installed around Movements below existing surface summarized presented various graphical formats facilitate comparison with current standard settlement prediction allow trends established. General conclusions drawn which it is hoped value movements future tunnels similar geology. (A)
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