Optimal Design Analysis on the Retaining Structure of Shield Work Shaft Excavation
Author(s): Cheng Chihao, Liao Shaoming, Pan Xuezheng, Liu jing, Department of Geotechnical Engineering, Tongji University, Hangzhou Highway Administration, Tianjin Urban Construction Design Institute
Pages: 1300-1307
Year: 2016 Issue: 5
Journal: Chinese Journal of Underground Space and Engineering
Keyword: deep foundation pit; optimization; numerical analysis; deformation control;
Abstract: The design of deep excavation needs to meet the requests of various aspects,such as safety,economic,sustainability and so on. Based on a shield work shaft excavation engineering in Hangzhou area,a series of parametric studies were performed with the finite element analysis software Plaxis to investigate the effect of some main factors on the stability of excavation,surface settlement,strut axial forces,displacement and internal forces of diaphragm walls. These main factors include reinforcement depth and its insert ratios、the thickness and the number of inner support of diaphragm walls. On the basis of the numerical analysis results,Some major findings were obtained:( 1) the optimized penetration ratio of diaphragm wall is between 0.8 and 1.0;( 2) the optimized thickness of diaphragm wall is between 0.9 and 1.1meters;( 3) the optimal number of inner support is 6;( 4) the optimal reinforcement depth of soil is 4 meters.
Pages: 1300-1307
Year: 2016 Issue: 5
Journal: Chinese Journal of Underground Space and Engineering
Keyword: deep foundation pit; optimization; numerical analysis; deformation control;
Abstract: The design of deep excavation needs to meet the requests of various aspects,such as safety,economic,sustainability and so on. Based on a shield work shaft excavation engineering in Hangzhou area,a series of parametric studies were performed with the finite element analysis software Plaxis to investigate the effect of some main factors on the stability of excavation,surface settlement,strut axial forces,displacement and internal forces of diaphragm walls. These main factors include reinforcement depth and its insert ratios、the thickness and the number of inner support of diaphragm walls. On the basis of the numerical analysis results,Some major findings were obtained:( 1) the optimized penetration ratio of diaphragm wall is between 0.8 and 1.0;( 2) the optimized thickness of diaphragm wall is between 0.9 and 1.1meters;( 3) the optimal number of inner support is 6;( 4) the optimal reinforcement depth of soil is 4 meters.
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