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

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.