重庆野茶水库大坝坝体分区方案研究

Study on dam zoning scheme of Yecha Reservoir dam in Chongqing

摘要

重庆奉节野茶水库大坝最大坝高90 m,坝型为混凝土面板堆石坝，大坝料场位于水库右侧支沟九洞溪库尾，料场地层岩性为灰岩夹角砾岩，其中灰岩为硬岩，角砾岩为软岩。坝体分区及坝料设计是高面板堆石坝设计的关键内容，为了合理利用料场资源，减少料场弃方量进而降低工程投资，利用有限元应力应变分析，研究在主堆石区和次堆石区采用硬岩与软岩混合料的可行性及适宜配比。研究结果表明，野茶水库面板堆石坝的主堆石区应选用灰岩作为坝料，次堆石区坝料选用灰岩：角砾岩≥60%∶40%的混合料，次堆石上部干燥区采用枢纽区弱风化砂页岩开挖料。

Abstract

The maximum dam height of the Yecha Reservoir Dam in Fengjie, Chongqing is 90 m. The dam is designed as a concrete face rockfill dam. The material field for the dam is located at the tail end of Jiudongxi Creek, a tributary on the right side of the reservoir. The geological formations in the material field consist of limestone interbedded with breccia, where limestone is classified as hard rock and breccia as soft rock. The zoning and material design of the dam are crucial aspects in designing high concrete face rockfill dams. To optimize the utilization of material resources and reduce the amount of material waste, thereby lowering project costs, finite element stress-strain analysis was employed to study the feasibility and appropriate mixing ratios of hard and soft rock materials in the primary and secondary rockfill zones. The research findings indicate that limestone should be used as the dam material in the primary rockfill zone of the Yecha Reservoir Dam. In the secondary rockfill zone, a mixture of limestone and breccia with a ratio of at least 60% limestone to 40% breccia is recommended. Additionally, excavation material from the weakly weathered sandstone and shale in the core area should be used in the dry upper section of the secondary rockfill zone.

关键词

面板堆石坝 / 大坝分区 / 灰岩 / 混合料

Key words

concrete face rockfill dam / zoning design of dams / limestone / mixture of limestone and breccia

Author summay

郑太文(1985—), 男, 高级工程师, 学士, 主要从事水利水电工程规划、设计、咨询及管理工作。E-mail: [e-mail]