水—力作用下膨胀性黏土岩结构性退化研究进展

Advances in Structural Degradation of Expansive Claystone Under Coupled Hydro-Mechanical Condition

摘要:

膨胀性黏土岩的结构退化特性引起的工程问题已经引起了国内外广泛关注。综述了国内外针对不同水—力作用下膨胀性黏土岩的结构性退化的宏微观表征、退化机理和模型等方面现阶段取得的重要成果；分类梳理了室内试验结果，将其汇总为宏观指标（物理、力学指标）与微观指标（定性分析、定量指标）；厘清退化机理，将其总结为水致退化与力致退化；归纳退化模型构建方法，将其提炼为经验修正法、弹塑性损伤法与结构简化法。针对尚未攻克的难题，在膨胀性黏土岩结构性退化的评价指标完善、机理深化和模型建立等方面给出了具体的建议及未来研究方向，以期为含黏土岩的工程实际应用、研究提供参考与借鉴。

Abstract:

The structural degradation characteristics of expansive claystone have led to engineering problems that have attracted widespread attention both domestically and internationally. This paper reviews the significant achievements currently obtained in the macroscopic and microscopic characterization， degradation mechanisms， and modeling of the structural degradation of expansive claystone under different hydro-mechanical conditions. The experimental results are classified and summarized into macroscopic indicators （physical and mechanical properties） and microscopic indicators （qualitative analysis and quantitative indicators）. The degradation mechanisms are clarified and summarized as hydro-induced degradation and force-induced degradation. The methods for degradation models are summarized and refined into empirical correction methods， elastoplastic damage methods， and structural simplification methods. To address unsolved problems， this paper provides specific suggestions and future research directions from the perspective of improving the evaluation indicators， deepening the mechanisms， and establishing models for the structural degradation of expansive claystone， in order to provide references and insights for practical engineering applications and research of claystone-containing projects.