Measured short-term ground surface response to EPBM tunnelling in London Clay
| العنوان: | Measured short-term ground surface response to EPBM tunnelling in London Clay |
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| المؤلفون: | Jamie Standing, Michael S. P. Wan, David M. Potts, John Burland |
| المساهمون: | Engineering & Physical Science Research Council (EPSRC), Geotechnical Consulting Group |
| المصدر: | Géotechnique. 67:420-445 |
| بيانات النشر: | Thomas Telford Ltd., 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | Technology, Engineering, 0211 other engineering and technologies, 020101 civil engineering, 02 engineering and technology, Geological & Geomatics Engineering, 0905 Civil Engineering, 0201 civil engineering, settlement, field instrumentation, Earth and Planetary Sciences (miscellaneous), Surface response, Geotechnical engineering, Engineering, Geological, ground movements, tunnels & tunnelling, Quantum tunnelling, 021101 geological & geomatics engineering, Science & Technology, CONSTRUCTION, business.industry, Settlement (structural), Levelling, 0914 Resources Engineering and Extractive Metallurgy, Geotechnical Engineering and Engineering Geology, Term (time), monitoring, 0907 Environmental Engineering, Volume loss, business |
| الوصف: | Earth-pressure-balance machines (EPBMs) were used for the construction of Crossrail tunnels in London, providing opportunities for field investigation of consequent ground response. Analysed results from an instrumented research site in Hyde Park with extensive surface and subsurface monitoring arrays are presented and discussed. The Crossrail tunnels at the site are 34·5 m below ground, deeper than those in most case histories of tunnelling in stiff clay in the UK. This paper characterises the tunnelling-induced ground response, both ‘greenfield’ and in the proximity of the existing Central Line tunnels, dealing with measurements at the ground surface. A companion paper covers the subsurface ground response. Vertical and horizontal ground surface displacements were obtained from manual precise levelling and micrometer stick measurements. Several key findings will benefit future tunnelling projects involving EPBMs. Volume loss values measured at the instrumented site were low, being less than 0·8% and 1·4% for the first and second tunnel drives respectively, higher values being associated with ground softening from the first tunnel construction. Smaller volume losses were recorded in the vicinity of the existing Central Line tunnels, compared with the greenfield location, suggesting that their presence inhibited the development of ground movements. Asymmetric settlement troughs developed due to either the nearby pre-existing tunnels or the construction of the first tunnel. Marginally smaller values of trough width parameter, Ky, were determined for these deeper tunnels compared with previous greenfield ground case histories. Resultant vectors of ground surface displacement were directed to well-defined point-sinks above the tunnel axis level. |
| تدمد: | 1751-7656 0016-8505 |
| DOI: | 10.1680/jgeot.16.p.099 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d1123dac8eb7ce01acc01fc59d89bba1 https://doi.org/10.1680/jgeot.16.p.099 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....d1123dac8eb7ce01acc01fc59d89bba1 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 17517656 00168505 |
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| DOI: | 10.1680/jgeot.16.p.099 |