| 章青,刘攀勇,顾鑫,乔延赫.土壤干缩开裂和卷曲分析的数值模型与若干进展Ⅰ：基本方程与网格类数值方法[J].水利学报,2025,56(1):42-55 |
| 土壤干缩开裂和卷曲分析的数值模型与若干进展Ⅰ：基本方程与网格类数值方法 |
| Advances in numerical model of soil desiccation cracking and curling Ⅰ： Foundational equations and mesh-based numerical methods |
| 投稿时间：2024-05-16 |
| DOI：10.13243/j.cnki.slxb.20240292 |
| 中文关键词: 土壤干缩开裂 土层卷曲 多物理场耦合作用 力学机制 网格类数值模型 |
| 英文关键词: soil desiccation cracking curling multi-physical field coupling mechanical mechanism mesh-based numerical method |
| 基金项目:国家自然科学基金项目(12472200，12172121，12002118);湖南省水利科技项目(XSKJ2023059-16) |
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| 中文摘要: |
| 随着全球气候环境的变化和极端干燥天气的多发，土壤干缩开裂和卷曲问题愈加受到关注。土壤干缩裂缝和卷曲的产生破坏了土体结构的完整性，容易引起各种潜在的自然灾害。土壤干缩开裂和卷曲问题极为复杂，涉及水分蒸发、土体收缩、裂纹演化、空气侵入以及土层卷曲等过程，耦合了热-水-力-化等多物理场的相互作用。发展土壤干缩开裂和卷曲分析的数值模型和高效算法，再现蒸发条件下土壤的水分演化、体积收缩、裂纹扩展和土层卷曲的全过程，仍然面临着复杂的科学挑战。本文重点论述了土壤水分蒸发过程中水分演化、体积收缩、裂纹萌生和土层卷曲的力学机制，分析了致使土壤干缩开裂和卷曲的主要影响因素，给出了土壤开裂和卷曲分析的基本方程，评述了网格类数值方法在土壤干缩开裂和卷曲分析领域的发展与应用情况。分析表明，常规的网格类数值方法受到变形连续性假定和网格的约束，难以解决多裂纹和三维复杂裂纹的扩展问题。无网格粒子类方法直接在离散点集上构造插值基函数，在捕捉复杂土体的开裂和卷曲行为上具有很大的潜力。 |
| 英文摘要: |
| Soil desiccation cracking and curling is widely concerned by people，especially with the vagaries of climate and the frequent occurrence of extreme dry weather.The desiccation cracks and curling weaken the strength of soil structure，causing various potential natural disasters.However，the problem of soil desiccation cracking and curling presents a certain level of complexity.Specifically，it is coupled with the process of moisture evaporation，soil shrinkage，dry cracking，air intrusion and soil curl，and involves the interaction of many physical fields such as heat-water-mechanics-chemistry.Therefore，it is still a great scientific challenge to develop a numerical model with efficient algorithm，capable of realizing the calculation of moisture evolution，volume shrinkage，crack growth and curling under evaporation conditions.The authors intend to discuss the aforementioned issues in two papers.In this paper，the mechanical mechanism of desiccation cracking and curling is analyzed with the main influencing factors，and the foundational equations of moisture diffusion and the elastic-plastic constitutive are provided for numerical calculation.In addition，the development and application of mesh-based method in the soil desiccation cracking and curling are reviewed，including the advantage and existing problems of grid numerical method.Through analysis and comparison，the conventional mesh-based numerical methods are constrained by the assumptions of deformation continuity，making it difficult to address issues of multi-crack and three-dimensional complex crack propagation.In contrast，mesh-free particle methods directly construct interpolation basis functions on a set of discrete points，showing great potential in capturing the complex soil desiccation cracking and curling behavior. |
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