کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
311734 534125 2016 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Lining structural monitoring in the new underground service of Naples (Italy)
ترجمه فارسی عنوان
نظارت بر نظارت بر ساخت و ساز در سرویس زیرزمینی ناپل (ایتالیا)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
چکیده انگلیسی


• Tunnelling for underground railways by NATM through unsaturated pyroclastic silty sand.
• Monitoring the internal forces arising in two instrumented steel ribs.
• Interpretation and numerical back-analysis of measurements via FEM.

A new underground stretch connecting two existing lines of the urban railway underground system was built in Naples. The tunnel was excavated by NATM through unsaturated pyroclastic silty sand at relatively large depths, ranging between thirty to eighty metres. The geometry of the section is rather typical with a top part shaped as half a circle and a rectangular bottom. The tunnel was conventionally built with a staged construction: after the full face excavation, a temporary lining composed by horse-shoe steel ribs and sprayed concrete was put in place. Two steel ribs, spaced about one hundred metres apart and located about sixty metres below the ground surface, were instrumented with twenty-four vibrating wire strain gauges, installed at six symmetric locations. Nearly two years of measurements were collected. In the paper the measured strains and the back-calculated internal forces are reported. The results of FE 3D and 2D back-analyses are also shown allowing to throw a light on the observed behaviour.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tunnelling and Underground Space Technology - Volume 51, January 2016, Pages 152–163
نویسندگان
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