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Upper-bound solutions for face stability of circular tunnel in purely cohesive soil using continuous rotational velocity field

机译：连续旋转速度场在纯粘性土中圆形隧道面稳定性的上限解

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摘要

This paper presents a 2D analysis model based on limit analysis and slip-line theories for the face stability of a circular tunnel in purely cohesive soil. The analysis model depends on the ratio of cover depth C to tunnel diameter D. When C/D is equal to 0.5, the mechanism consists of three blocks, namely, Zone I, Zone II, and Zone III. When C/D is greater than 0.5, the mechanism consists of four blocks, namely, Zone I, Zone II, Zone III, and a possible Zone IV. Zone II is a transition zone satisfying the normality conditions. The possible Zone IV is a Rankine zone that is subjected to the influence of the vertical soil arching effect appearing at the top of Zone III. The criterion for the collapse thickness limit of the tunnel is proposed based on Terzaghi's theory of relative soil pressure. The results show that significant improvements have been made to the existing solutions using the proposed failure mechanism for the face stability of circular tunnels in purely cohesive soil. (C) 2018 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：本文提出了一种基于极限分析和滑移线理论的纯粘性土中圆形隧道面稳定性的二维分析模型。分析模型取决于覆盖层深度C与隧道直径D的比率。当C / D等于0.5时，该机制由三个块组成，即I区，II区和III区。当C / D大于0.5时，该机构由四个块组成，即I区，II区，III区和可能的IV区。 II区是满足正态性条件的过渡区。可能的IV区是一个朗肯区，受到III区顶部出现的垂直土拱效应的影响。基于Terzaghi的相对土压力理论，提出了隧道坍塌厚度极限的判据。结果表明，使用建议的破坏机制对纯粘性土中圆形隧道的面板稳定性进行了重大改进。 （C）2018年由Elsevier B.V.代表日本岩土工程学会制作和托管。

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