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Centrifuge modeling of tunneling-induced ground surface settlement in sand

Underground Space 2019年第4期4卷 302-309页

作者： Hu Lu Jiangwei Shi Yu Wang Rong Wang Shenzhen Polytechnic No.7098 Liu Xian AvenueNanshan DistrictShenzhenChina Key Laboratory of Geomechanics and Embankment Engineering of the Ministry of Education Geotechnical Research InstituteHohai University1 Xikang RoadNanjing 210098China Department of Architecture and Civil Engineering City University of Hong KongTat Chee AvenueKowloonHong KongChina China Harbour Engineering Company Ltd. No.9Chunxiu RoadDongzhi GateDongcheng DistrictBeijingChina

Stress changes in the soil induced by tunnel excavation may cause excessive ground ***,high-quality experimental data on ground settlement due to tunnel excavation are *** this study,centrifuge tests are conducted to investigate the threedimensional ground surface settlement,considering different intersection angles and cover-to-tunnel diameter *** results indicate that the major influence zone along the longitudinal direction on the ground surface settlement is±1.25D,where D is the tunnel *** the monitoring section is perpendicular to the tunneling direction,the transverse ground settlement due to the tunnel excavation is symmetrical with respect to the tunnel *** contrast,an asymmetric ground settlement profile is observed when the monitoring section intersects the tunneling direction at an angle of 60.Applying a Gaussian curve to fit the ground surface settlement curve,the width parameter,K(i.e.,the distance between the tunnel centerline and the inflection point of the settlement trough to the tunnel burial depth),varies from 0.33 to *** ground surface settlement induced by twin tunnel excavation can be captured reasonably by superimposing two identical Gaussian *** the cover to tunnel diameter ratios(C/D)are 1.5 and 2.7,the maximum ground surface settlements are 0.67%of D and 0.35%of D,*** is clear that the maximum ground surface settlement decreases with an increase in the C/D ratio.

关键词： Ground settlement Centrifuge modeling Intersection angle cover-to-tunnel diameter Three-dimensional

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