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《Chinese Journal of Underground Space and Engineering》 2012-01
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3D Numerical Analysis of Deep Station Excavation Constructed in Round Gravel Strata

Li Jiayu1,Zhang Zixin2,(1.Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;2.Key Laboratory Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China)  
Based on the excavation of the Guangxi University Station of the Nanning Metro Line 1,this paper employs the numerical analysis software FLAC3D to simulate the complex excavation process.By implementing a deep comparison between the numerical results and the monitoring data,the research draws a general conclusion about the deformation characteristics of diaphragm walls and surrounding ground surface of subway station excavations in round gravel strata.The analysis results indicate that:(1) the influential range of the surrounding ground by excavation is about 0~4H(H——the depth of excavation);(2) the overall settlement is relatively small,and the maximum value usually occurs in places within about 0.6H from the excavation border;(3) the primary influential range is 0~2H,and the secondary influential range is 2~4H;(4) for such sites rich in round-gravels,Mohr-Coulomb model can give satisfactory predications within the 3H range,but cannot reasonably be applied outside this range because of the divergence which would produce considerable errors between numerical results and monitoring data.
【Fund】: 长江学者和创新团队发展计划资助(IRT 1029)
【CateGory Index】: U231.3
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Chinese Journal Full-text Database 7 Hits
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