3D effects of turning corner on stability of geosynthetic-reinforced soil structures |
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Authors: | Fei Zhang Yufeng Gao Dov Leshchinsky Shangchuan Yang Guangyu Dai |
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Affiliation: | 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, 210098, China;2. Jiangsu Province''s Geotechnical Research Center, Nanjing, 210098, China;3. Department of Civil and Environmental Engineering, University of Delaware, Newark, DE, 19716, USA;4. ADAMA Engineering, 12042 SE Sunnyside Rd., Suite 711, Clackamas, OR, 97015, USA;5. Department of Geotechnical Engineering, School of Civil Engineering, Southwest Jiaotong University, 610031 Chengdu, China |
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Abstract: | Current design procedures of Geosynthetic-Reinforced Soil Structures (GRSS's) are for walls/slopes with long straight alignments. When two GRSS segments intersect, an abrupt change in the alignment forms a turning corner. Experience indicate potential instability problems occurring at corners. The purpose of this study is to explore the effects of turning corner on the stability of reinforced slopes. Three-dimensional (3D) slope stability analysis, based on limit equilibrium, resulted in the maximum tensile force of reinforcement. Parametric studies required numerous computations considering various geometrical parameters and material properties. The computed results produced efficient practical format of stability charts. For long-term stability of reinforced slopes with turning corner, the influences of pore water pressure and seismic loading are also considered. Turning corner can improve the stability of reinforced slopes by virtue of inclusion of end effects. However, localized increase of pore water pressure or directional seismic amplification may decrease locally thus stability requiring strength of reinforcement larger than in two-dimensional (2D) plane-strain. While using 2D analysis for non-localized conditions may require stronger reinforcement, it also requires shorter reinforcement than in 3D analysis; i.e., 2D analysis may be unconservative in terms of reinforcement length. |
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Keywords: | Geosynthetics Reinforced soil Corner Slope stability Three dimension Limit equilibrium |
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