The effect of clay swelling on crack generation in red stratum soft rock during water-induced disintegration: a matrix-based discrete element simulation study
Shiqi Li, Zhongping Yang, Yuhao Gao, Xinrong Liu, Xiaoguang Jin
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引用次数: 0
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.
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.