**6. Summary and conclusion**

Great advancements in constructing high rockfill dams on thick overburden layers have been achieved in China over the past 20 years. Successful practice can be attributed to progresses in geological and geotechnical investigation techniques, proper designing and connection of the watertight systems, as well as the careful foundation improvement measures. It can be expected that even challenging geological conditions may be encountered in the future, which poses pressing needs in the following aspects:

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