INVESTIGATION ON CONCRETE MICROSTRUCTURAL EVOLUTION AND SLOPE STABILITY BASED ON COUPLED FRACTAL FLUID–STRUCTURE MODEL

Fractals Pub Date : 2024-04-01 DOI:10.1142/s0218348x24500555
Tingting Yang, Yang Liu, Guannan Liu, Boming Yu, Mingyao Wei
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Abstract

Slope instability is a common type of damage in embankment dams. Analyzing its microstructural changes during water transport is beneficial to identify the critical damage point in more detail. To this end, we closely link both diffused water molecule and damaged concrete. On the basis of the original research on fractal theory, the fractal permeability model for the pore system is established. At the same time, considering the pore structure characteristics of concrete, the models for fluid–solid coupling inside and outside the embankment are established in this work. The simulated results and experimental data agree well, thus verifying the correctness of the proposed models. The changes of concrete pore structures under different water pressure and different initial porosities are simulated by numerical methods. The results show that: (1) with the increase of the safety factor, the slope of the embankment begins to be damaged at the critical point and then completely destabilized; (2) with the increase of the pressure head, the change of the fractal dimension of the embankment’s porosity from the top to the bottom changes from linear to nonlinear. (3) The initial porosity of concrete is proportional to the evolution of concrete pore structure. From a technical point of view, this study can contribute the effective technical guidance for related professional practitioners in the analysis of embankment slope stability from a microscopic point of view.
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基于分形流固耦合模型的混凝土微结构演化与边坡稳定性研究
边坡失稳是堤坝常见的一种破坏类型。分析其在输水过程中的微观结构变化有利于更详细地确定临界破坏点。为此,我们将扩散水分子与受损混凝土紧密联系起来。在原有分形理论研究的基础上,建立了孔隙系统的分形渗透模型。同时,考虑到混凝土的孔隙结构特点,建立了堤坝内外的流固耦合模型。模拟结果与实验数据吻合良好,从而验证了所建模型的正确性。通过数值方法模拟了不同水压和不同初始孔隙率下混凝土孔隙结构的变化。结果表明(1) 随着安全系数的增加,堤坡在临界点开始破坏,然后完全失稳;(2) 随着压力水头的增加,堤坝孔隙率的分形维数变化从顶部到底部由线性变为非线性。(3)混凝土的初始孔隙率与混凝土孔隙结构的演变成正比。从技术角度看,本研究可为相关专业从业人员从微观角度分析堤坡稳定性提供有效的技术指导。
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