为研究南水北调工程关键技术“膨胀土地段渠道破坏机理及处理技术”问题，开展了膨胀岩试验段工程（潞王坟段）现场试验。根据现场试验成果，从渠坡稳定性监测、防护监测两方面，提出了膨胀岩土渠坡失稳 2 种破坏模式，综合评价渠坡处理措施防护效果，推荐渠坡处理方案。建议膨胀岩渠坡处理应优选土工格栅加筋处理措施；对于处理断面为出口段、扭曲面等适宜点状作业的施工面，可采用土工袋处理措施；土工膜处理措施由于没有压重效果，可用于低地下水位且侧向补给较差的一级马道以上渠坡处理。

Field tests have been made in the expansive rock test section(Luwangfen Section) to study the failure mechanism of and the treatment measures for expansive soil canal slope, which is considered as a key technology of the South-to-North Water Diversion Project. Based on the test results, two failure modes of unstable canal slope are put forward according to the stability monitoring and protection survey. The effects of the treatment measures are comprehensively evaluated, and treatment plans for the canal slope are proposed. Reinforced geogrid is recommended first and foremost in the treatment ； while soilbag can be used at the outlet or twisted section where spot treatment is required ； and composite geo  membrane, as it has no weights effect, can be used at the canal slope above the first berm with low groundwater level and little lateral recharge.