云南勐堆水库利用花岗岩风化砂筑坝可行性研究

云南保山勐堆水库工程位于花岗岩地区，坝址区方圆数千米内均是花岗岩，坝基两岸岩体全风化深度大，只适合修建土石坝。坝址附近花岗岩风化砂分布广泛，厚度大、储量多、易于开采。通过调查、收集国内外一些工程利用花岗岩风化砂作为大坝填筑料的成功经验，对勐堆水库工程及周边的花岗岩风化砂物理力学性质、风化机制及长期稳定性、动力特性及风化砂坝体稳定性等进行了研究。研究表明：无论从理论上或是实践上，勐堆水库工程及周边的花岗岩风化砂作为分区坝填筑料使用均是可行的。建议通过合理的设计和施工充分发挥勐堆水库工程及周边的花岗岩风化砂特性，修建既经济又环境交好安全的分区坝。

Feasibility study on dam built by granite weathered sand: case of Mengdui Reservoir in Yunnan Province

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.