کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
311810 534142 2016 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Examining the influence of TBM-ground interaction on electrical resistivity imaging ahead of the TBM
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
Examining the influence of TBM-ground interaction on electrical resistivity imaging ahead of the TBM
چکیده انگلیسی


• Electrical resistivity predicts changing ground conditions during tunnel construction.
• We model the integration of electrical resistivity to TBM tunnel construction.
• TBM type can influence prediction distance ahead of the TBM.
• Use of cutting tools as electrodes offers prediction further ahead of TBM.
• Electrical resistivity can predict five TBM diameters in front of TBM.

Tunnel excavation by means of tunnel boring machines (TBMs) is susceptible to unknown changes ahead of the tunnel face. Geophysics offers a technique called electrical resistivity that can continuously, in real-time, spatially map the formation in front of the TBM. Electrical resistivity has been successfully established for many applications including vadoze zone hydrology, oil/gas location, mineral location and failure detection in geo-structures. Yet it has not been well-established for TBM excavations. This is in part due to the complexity of the TBM tunneling environment and the uncertain influence this environment may have on the success of TBM-integrated-electrical resistivity to predict changes ahead of the tunnel face. One significant uncertainty lies in the interface region that exists around the TBM created during the modification of the virgin formation by a mechanical mixing action of the rotating cutterhead and the injection of additives used to aid in the extraction of the muck and protect the cutting tools from frictional wear. In this study, we investigate the influence of this interface region on TBM-integrated-electrical resistivity for both hard rock and soft ground tunneling conditions through finite element modeling. Regarding the performance of TBM-integrated-electrical resistivity to detect changes ahead of the cutting face, the interface region holds significant influence for both earth pressure balance (EPB) and open mode tunneling conditions. Electrical resistivity for slurry based tunneling is not influenced by the interface region. Simulations suggest that TBM-integrated-electrical resistivity can be sensitive to a formation change that is located up to five diameters in front of the TBM.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tunnelling and Underground Space Technology - Volume 58, September 2016, Pages 82–98
نویسندگان
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