The Xinhua slope of Dagangshan Reservoir is taken as an example to study the potential for reservoir landslides under the combined effects of rainfall and water level fluctuations. Through field investigation, monitoring analysis by global navigation satellite system and numerical simulation, the hydraulic response and stability of the accumulated deposits on the Xinhua slope were evaluated. Three occurrences of large deformations were recorded by real-time monitoring. By comparing the deformation records with the hydrological records, it was found that the first one was caused by water storage, and the last two were due to the coupling effect of rainfall and water level drawdown. Deformation of the reservoir overburden cannot simply be thought of as the sliding of a single block (geology survey showed deep sliding surfaces with depths of 50–70 m), but shallow sliding (less than 5 m) is also much likely to occur revealed by a supporting evidence from deformation records. In cases where hydrostatic pressure and transient osmotic forces are favorable for shear resistance, softening may play a major role in the process of impoundment leading to deformation. The deformation pattern of the slope deposits changes as it enters operation. A drawdown of water level during flood season accelerates the deformation, while a following rise of water level inhibits this acceleration. More extensive monitoring (i.e. pore water pressure sensor and inclinometer) and more in-depth analysis are needed in the future, and this article is a synthesis of limit equilibrium and infinite slope analysis to better understand the deformation patterns and response mechanisms of reservoir accumulation.

以大港山水库新华坡为例，研究降雨和水位涨落共同作用下水库滑坡的可能性。通过野外调查，全球导航卫星系统监测分析和数值模拟，评价了新华山斜坡堆积物的水力响应和稳定性。通过实时监控记录了3次大变形的发生。通过将变形记录与水文记录进行比较，发现第一个是由于蓄水引起的，最后两个是由于降雨和水位下降的耦合作用引起的。储层覆盖层的变形不能简单地认为是单个块的滑动（地质调查显示，深度为50-70 m的深滑动面），但是变形记录的辅助证据也表明，很可能发生浅滑动（小于5 m）。如果静水压力和瞬态渗透力有利于抗剪力，则软化在蓄水过程中可能会起主要作用，导致变形。斜坡沉积物的变形模式随其进入运行而变化。洪水期间水位的下降会加速变形，而随后水位的上升会抑制这种加速。未来需要更广泛的监测（即孔隙水压力传感器和测斜仪）和更深入的分析，本文是极限平衡和无限边坡分析的综合，以更好地理解储层的变形模式和响应机制。