Climate-induced rises in air temperature and humidity on the Qinghai-Tibet Plateau modify the hydrothermal conditions of closed crushed-rock embankments (CRE). This alternation arises from the infiltration of summer rainfall, which is closely correlated with the cooling performance of the crushed-rock layers (CRL). Nevertheless, the cooling performance of the closed CRL during the summer rainfall season remains unexplored. In these present, physical models were employed to examine the convective properties and hydrothermal response processes. The results reveal that summer rainfall greatly diminishes the natural convection intensity within the closed CRL. Conversely, cycle-average temperatures showed an upward trend under these conditions. Moreover, based on fluctuations in the thawing/freezing index, the cooling capacity of the CRL weakens post-summer rainfall, with a maximum decline of 27.3% compared with the initial cycle. Additionally, the humidity in the subsoil layer experiences a stepwise growth followed by a gradual decrease owing to concentrated rainwater percolation. After enduring four rainfall events, the volumetric water content in the subsoil layer presents an upward trajectory. Overall, infiltrated water introduces additional heat, modifying the hydrothermal and convective properties of closed CRE, consequently impairing the cooling efficacy of the CRL.

气候引起的青藏高原气温和湿度上升改变了封闭碎石路堤（CRE）的水热条件。这种交替是由夏季降雨的渗透引起的，这与碎岩层（CRL）的冷却性能密切相关。尽管如此，封闭式CRL在夏季雨季的冷却性能仍有待探索。在这些研究中，物理模型被用来检查对流特性和热液响应过程。结果表明，夏季降雨极大地削弱了封闭CRL内的自然对流强度。相反，在这些条件下，周期平均温度呈现上升趋势。此外，基于融冰指数的波动，CRL的降温能力减弱了夏后降雨，与初始周期相比最大下降了27.3%。此外，由于集中雨水渗滤，地下土层的湿度经历了逐步增加然后逐渐减少的过程。经过四次降雨事件后，地下土层体积含水量呈现上升趋势。总体而言，渗透水引入了额外的热量，改变了封闭 CRE 的水热和对流特性，从而损害了 CRL 的冷却效率。