Stability of an unsupported vertical circular excavation in clays under undrained condition

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• 作者：Vishwas N. Khatri ; Jyant Kumar
• 关键词：Axisymmetric problems ; Excavation ; Limit analysis ; Optimization ; Plasticity
• 刊名：Computers and Geotechnics
• 出版年：2010
• 出版时间：April 2010
• 年：2010
• 卷：37
• 期：3
• 页码：419-424
• 全文大小：587 K

文摘

By using the axisymmetric finite elements static limit analysis formulation, proposed recently by the authors, the stability numbers (γH/c_o) for an unsupported vertical circular excavation in clays, whose cohesion increases with depth, have been determined under undrained condition; γ = unit weight, H = height of the excavation and c_o = cohesion along ground surface. The results are obtained for various values of H/b and m; where b = the radius of the excavation and m = a non-dimensional parameter which accounts for the rate of the increase of cohesion with depth. The values of the stability numbers increase continuously both with increases in H/b and m. The results obtained in this study compare well with those available in literature.