莫尔-库仑土不排水孔洞扩展研究:有限膨胀的考虑

IF 3.6 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
He Yang, Xu Wang, Shengli Chen, Pei-Zhi Zhuang, Hai-Sui Yu
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引用次数: 0

摘要

在无限膨胀的莫尔-库仑土中,不排水孔洞膨胀时,有效应力不断增大。本文重新研究了这一问题,并提出了一种新的解决方案,进一步考虑了有限土体膨胀。土体模型为非关联的莫尔-库仑模型,土体的极限膨胀由有限塑性体应变控制,超过该极限后土体的膨胀角降为零。辅助变量法和总应变法都适用于解的推导,因为前者有助于给出更简洁的解,而后者在计算给定时间的应力和变形时更有效。基于新解进行了一系列参数化研究,重点研究了有限土胀的影响。有限膨胀土在停止膨胀后,有效应力瞬间保持稳定,而不是继续增加,超水压和总内腔压力逐渐增加到稳定状态。如果不考虑土的极限膨胀,则会严重高估空腔极限压力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Revisiting Undrained Cavity Expansion in Mohr–Coulomb Soils: Consideration of Limited Dilation

The effective stresses are found to continually increase for undrained cavity expansion in Mohr–Coulomb soils with unlimited dilation. This paper revisits this problem and presents a new solution with further consideration of limited soil dilation. The soil is modelled as a non-associated Mohr–Coulomb model, and the limited dilation is controlled by the limited plastic volumetric strain, beyond which the soil dilation angle drops to zero. Both the auxiliary variable approach and total strain approach are leveraged for solution derivation, as the former helps to give more concise solutions while the latter is more efficient in calculating the stresses and deformation at a given time. A series of parametric studies is conducted based on the new solution, with highlighting on the influence of limited soil dilation. When dilation ceases for soils with limited dilation, it is found that the effective stresses remain steady instantly rather than keep increasing, and the excess water pressure and total inner cavity pressure gradually increase to steady states. The limit cavity pressure will be heavily overestimated if the limited soil dilation is neglected.

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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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