膨胀岩的边坡稳定主要受地层岩性、地质结构和构造、膨胀等级、地下水环境等因素控制，由于岩和土的生成历史不同，导致它们的矿物成分、胶结强度也有所不同。根据南水北调中线工程新乡潞王坟膨胀岩现场试验段裸坡试验区的人工降雨试验，分析了膨胀岩渠坡的变形和滑动特征。试验成果显示：膨胀岩渠坡的变形和破坏特征主要表现为雨淋沟、坡面隆起和局部浅层滑动；造成破坏的主要外在因素是施工卸荷、干旱半干旱气候和降雨。研究成果为膨胀岩渠坡设计和破坏机理的分析提供了基础。

The slope stability of expansive rock is essentially controlled by the rock properties, geological structure, the expansion grade and ground water environment. The mineral composition and cementation strength between the rock and soil vary because of their different formation histories. The artificial rainfall tests have been carried out at the experimental canal slopes at the Middle Route of the South to North Water Diversion Project at Xinxiang, Henan Province. The characteristics of the deformation and slide characteristics are analyzed on the basis of the above tests. The test results show that the main characteristics of deformation and failure of expansive rock slop are the ditches formed by rainfall, slope heave, local shallow sliding, and that the primarily external factors are construction unloading, arid and semi-arid climates and precipitation. The research production is a basis to the engineering design and the investigation for the failure mechanism of the expansive rock slope.