关键词: 风化砂, 大坝填筑, 坝型选择, 分区利用

Abstract: The Mengdui reservoir project in Yunnan is located in granite area. Deep weathering occurred on both sides of the dam foundation, resulting in only earth rockfill dam can be constructed. The nearby weathered granite sand are widely distributed with large thickness and reserves and are easy to mine. Therefore, the research on the feasibility of using granite weathered sand mined in nearby area as dam building material is of great significance to building economic, safe and environment-friendly dam. Through investigating and collecting the successful experience of some projects at home and abroad in dam building using weathered sand as the dam filling material, this paper studied the physical properties, weathering cause, long-term stability, dynamic properties of the weathered sand and the dam stability built by weathered sand. The results showed that: both in theory and in practice, it is feasible to use the weathered sand as zoned dam filling materials. It is suggested that the engineering properties of weathered sand should be fully given into play in the design and construction to build economic and safe zoned dam.

Key words: weathered sand, dam filling, dam type selection, zoning utilization