The effect of clay swelling on crack generation in red stratum soft rock during water-induced disintegration: a matrix-based discrete element simulation study

IF 3.7 2区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL
Shiqi Li, Zhongping Yang, Yuhao Gao, Xinrong Liu, Xiaoguang Jin
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Abstract

Red stratum soft rock, which is prevalent in the deep backfill regions of southwest China, exhibits water-induced disintegration characteristics that significantly impact the bearing capacity and deformation behaviours of the foundation. To further examine its damage evolution after encountering water, a numerical simulation study was conducted utilising the particle discrete element method, based on immersion testing. The water-induced disintegration of soft rock is characterised by the expansion of clay mineral particles and a reduction in breaking force and residual strength coefficient. The findings indicate that the disintegration of red stratum soft rock can be categorised into three stages: Surface Erosion, Crack Development, and Crack Penetration. Natural cracks enhances permeability, while any increase in clay mineral content heightens hydration sensitivity. These factors decrease the slaking durability index, exacerbating failure and potentially altering the disintegration mode. The excellent simulation outcomes in this case indicate that the discrete element method effectively simulates the disintegration process of red stratum soft rock. The work thus enhances understanding of disintegration mechanisms and paves the way for further elucidation of the complex behaviours of soft rock.

Abstract Image

水诱导崩解过程中粘土膨胀对红色地层软岩裂缝生成的影响:基于矩阵的离散元模拟研究
红层软岩普遍存在于中国西南地区的深层回填地区,具有水诱发的崩解特征,对地基的承载力和变形行为有重大影响。为了进一步研究其遇水后的破坏演化,我们在浸水试验的基础上,利用颗粒离散元法进行了数值模拟研究。水引起的软岩崩解的特点是粘土矿物颗粒膨胀,破坏力和剩余强度系数降低。研究结果表明,红层软岩的崩解可分为三个阶段:表面侵蚀、裂缝发展和裂缝渗透。自然裂缝会提高渗透性,而粘土矿物含量的增加会提高水化敏感性。这些因素都会降低坍塌耐久性指数,加剧坍塌并可能改变崩解模式。本案例中出色的模拟结果表明,离散元方法可有效模拟红色地层软岩的崩解过程。因此,这项工作增强了对崩解机制的理解,为进一步阐明软岩的复杂行为铺平了道路。
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来源期刊
Bulletin of Engineering Geology and the Environment
Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合
CiteScore
7.10
自引率
11.90%
发文量
445
审稿时长
4.1 months
期刊介绍: Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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