Danba Hydropower Station will be the first gate dam project in China with a dam height of more than 40 m on the deep overburden. The dam site area is dominated by deep Quaternary over burdenlayer with a maximum thickness of 127.66 m. The foundation of the retaining right #1 dam section is divid-ed into 5 cover layers with low deformation modulus and large compressibility. Such geological conditionscould result in uneven settlement on the dam and foundation,which has a direct impact on the stabilityand safet...