Numerical investigations of the mechanical properties and energy characteristics of sandy cobble strata considering its internal stochastic structures

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Fan Wang , Pengfei Li , Xiuli Du , Jianjun Ma , Lin Wang
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引用次数: 0

Abstract

Investigating the mechanical properties of sandy cobble strata is essential for optimizing the design and construction of urban tunnels, thereby controlling ground deformation and ensuring tunnel stability. This paper aims to comprehensively investigate the mechanical properties and energy characteristics of heterogeneous sandy cobble strata. Numerical simulations are employed to examine the stress–strain behavior and energy evolution mechanism in scenarios with and without interfaces between the soil matrix and blocks. Subsequent analysis focuses on elucidating the effects of the internal stochastic structures, which characterize heterogeneity, on the overall strength and energy characteristics. The results indicate that the presence of interfaces significantly compromises the overall strength, while exacerbating the occurrence of a tortuous plastic zone around blocks. The volumetric block proportion (VBP), which represents the volumetric content of cobbles, has a significant impact on the overall mechanical behaviour. In the context of high VBP, block sizes, counts and orientations play substantial roles. Finally, the discussion reveals that when blocks are modelled using the elastic model, the overall strength is significantly overestimated compared to the strain-softening and Mohr-Counlomb models, especially in scenarios with high VBP and in-situ stress. It provides an unsafe evaluation (i.e., overestimation) of tunnel stability.
考虑内部随机结构的砂卵石地层力学性能和能量特征的数值研究
研究砂卵石地层的力学特性对于优化城市隧道的设计和施工,从而控制地面变形和确保隧道稳定性至关重要。本文旨在全面研究异质砂卵石地层的力学特性和能量特征。本文采用数值模拟的方法,研究了土体基质与砌块之间有界面和无界面情况下的应力应变行为和能量演化机制。随后的分析侧重于阐明内部随机结构对整体强度和能量特征的影响,而内部随机结构正是异质性的特征。结果表明,界面的存在极大地影响了整体强度,同时加剧了砌块周围迂回塑性区的出现。体积块比例(VBP)代表鹅卵石的体积含量,对整体机械性能有显著影响。在 VBP 较高的情况下,砌块的尺寸、数量和取向都起着重要作用。最后,讨论表明,与应变软化模型和莫尔-库伦模型相比,使用弹性模型对鹅卵石进行建模时,整体强度被明显高估,尤其是在高 VBP 和原位应力的情况下。这提供了对隧道稳定性的不安全评估(即高估)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Computers and Geotechnics
Computers and Geotechnics 地学-地球科学综合
CiteScore
9.10
自引率
15.10%
发文量
438
审稿时长
45 days
期刊介绍: The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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