کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
311938 534160 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Analysis of loading effects on reinforced shotcrete ribs caused by weakness zone containing swelling clay
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
Analysis of loading effects on reinforced shotcrete ribs caused by weakness zone containing swelling clay
چکیده انگلیسی

Tunneling in weakness zones containing swelling clay represents one of the most difficult conditions in hard rock tunneling. Evaluation of rock support requirements in such zones is normally empirical, i.e. mainly based on experience. In this paper, rock supports in a major weakness zone containing swelling clay is analysed based on monitoring results and numerical analysis in order to enrich the experience of support evaluation under such conditions. The Finnfast subsea road tunnel is used as a case. Laboratory tests of the gouge material from the actual zone indicate that the swelling pressure is moderate. All instrumentation data and simulation results show that the loading on the sprayed concrete is far less than its compressive strength, even for the rock support without the reinforced sprayed concrete rib. This suggests that such zones may often be excessively supported when the swelling clay is not very active. It is also found that for reliable stability control through such zones the instrumentation should be installed as close to the excavation face as possible.

Research highlights
► Swelling clay in weakness zones considerably increases the loading on rock supports.
► In terms of tunnel stability the area close to the excavation face is more critical.
► Instrumentation close to the excavation face is more reliable for stability control.
► Weakness zones containing swelling clay may often be excessively supported.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tunnelling and Underground Space Technology - Volume 26, Issue 3, May 2011, Pages 472–480
نویسندگان
, , ,