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Seismic ground amplification induced by box-shaped tunnels

Earthquake Engineering and Engineering Vibration 2022年第3期21卷 697-714页

作者： Damoon Feizi jafar asgari marnani Hamid Alielahi Mehdi Panji Department of Civil Engineering Faculty of Civil and Earth Resources EngineeringCentral Tehran BranchIslamic Azad UniversityTehranIran Department of Civil Engineering Zanjan BranchIslamic Azad UniversityZanjanIran

The growing use of underground structures,specifically to facilitate urban transportation,highlights the need to scrutinize the effects of such spaces on the seismic ground response as well as the surrounding *** this regard,the seismic ground amplification variations in the vicinity of single and twin box-shaped tunnels subjected to SV waves have been investigated by the finite difference *** evaluate the effects,generalizable dimensionless diagrams based on the results of parametric numerical analysis considering factors such as variations in the tunnels′depth,the distances between the tunnels,tunnel lining flexibility,and input wave frequency,have been *** addition,to assess the effects of underground box-shaped tunnels on the response spectrum of the ground surface,seven selected accelerograms have been matched based on a specific design spectrum for the stiff soil condition of Eurocode 8(CEN,2006).The results underline the significant amplification effect of the box-shaped tunnels on the ground motions,specifically in the case of horizontal twin tunnels,which should be given more attention in current seismic design practices for surface structures.

关键词： seismic amplification box-shaped tunnels response spectra numerical method parametric studies buried depth

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Stability analysis of shallow tunnels subjected to eccentric loads by a boundary element method

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第4期8卷 480-488页

作者： Mehdi Panji Hamid Koohsari Mohammad Adampira Hamid Alielahi jafar asgari marnani Department of Civil Engineering Zanjan Branch Islamic Azad University Department of Civil Engineering Science and Research Branch Islamic Azad University Department of Civil Engineering Technical and Engineering Faculty Central Tehran Branch Islamic Azad University

This paper presents the results of the shear strength（frictional strength） of cemented paste backfillcemented paste backfill（CPB-CPB） and cemented paste backfillerock wall（CPB-rock） interfaces. The frictional behaviors of these interfaces were assessed for the short-term curing times（3 d and 7 d） using a direct shear apparatus RDS-200 from GCTS（Geotechnical Consulting ＆ Testing Systems）. The shear（friction） tests were performed at three different constant normal stress levels on flat and smooth interfaces. These tests aimed at understanding the mobilized shear strength at the CPB-rock and CPB-CPB interfaces during and/or after open stope filling（no exposed face）. The applied normal stress levels were varied in a range corresponding to the usually measured in-situ horizontal pressures（longitudinal or transverse） developed within paste-filled stopes（uniaxial compressive strength, s c 150 k Pa）. Results show that the mobilized shear strength is higher at the CPB-CPB interface than that at the CPB-rock interface. Also, the perfect elastoplastic behaviors observed for the CPB-rock interfaces were not observed for the CPB-CPB interfaces with low cement content which exhibits a strain-hardening behavior. These results are useful to estimate or validate numerical model for pressures determination in cemented backfill stope at short term. The tests were performed on real backfill and granite. The results may help understanding the mechanical behavior of the cemented paste backfill in general and, in particular, analyzing the shear strength at backfillebackfill and backfill-rock interfaces.

关键词： Cemented paste backfill(CPB) Shear tests Backfill-rock wall interface Shear strength Adhesion Apparent cohesion Interface friction angle

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