基于应变软化的弱夹层膨胀土边坡失稳机理研究

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Shuai Xu, Hanjing Jiang, Yongfu Xu, Aoxun Wang, Shunchao Qi
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引用次数: 0

摘要

膨胀土在世界范围内广泛存在,并且与人类活动频繁的地区相吻合。膨胀土边坡深层失稳的主要原因是开挖和渗流造成的软化。本研究以非饱和土理论为基础建立了一个综合数值模型,通过水力机械耦合数值模拟研究了膨胀土边坡的应力和位移分布特征。研究分析了边坡在开挖卸荷和蓄水渗流作用下的演变规律,揭示了膨胀土边坡深层失稳的机理。研究结果表明膨胀土边坡的失稳始于坡脚,并沿夹层传播,影响整个边坡。开挖导致膨胀土夹层软化和剪应力传递。在蓄水期间,土壤强度的减弱会导致沿薄弱夹层滑动的斜坡失稳。膨胀土夹层的软化促进了斜坡剪力的重新分布,并改变了深层塑性区的分布规律。过度放缓斜坡会导致大量开挖卸荷,不利于斜坡的稳定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation on the Instability Mechanism of Expansive Soil Slope With Weak Interlayer Based on Strain Softening

Expansive soils are widespread in the world and coincide with areas of high human activity. The main cause of deep instability of expansive soil slopes is due to their softening caused by excavation and seepage. By developing a comprehensive numerical model based on the theory of unsaturated soil, this study examines the characteristics of stress and displacement distribution of expansive soil slopes through hydraulic-mechanical coupled numerical simulation. This study analyzes the evolution patterns of slopes with excavation unloading and seepage of water storage to reveal the mechanisms of deep-seated instability of expansive soil slopes. The findings demonstrate that: The instability of expansive soil slopes begins at the foot of the slope and propagates along the interlayer, affecting the entire slope. Excavation leads to the softening of the expansive soil interlayer and the transfer of shear stress. During water storage, the weakening of the soil strength results in slope instability along the weak interlayer slip. Softening of the expansive soil interlayer facilitates the redistribution of shear forces in the slope and alters the distribution law of the plastic zone in the deep layer. Overly slowing down the slope leads to significant excavation unloading, which is detrimental to the slope's stability.

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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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