新型排洪方式在尾矿库扩容工程中的应用分析

某尾矿库加高扩容采用模袋筑坝工艺，现有排洪设施不能满足扩容后的排洪要求，需要对现有排洪方式进行改造。根据尾矿库扩容方案特点，通过对阶梯式和分区两种排洪方式的比较，从排洪安全、施工难度及工期、运行管理、工程造价等多方面进行分析后，确定采用在库内新建模袋坝上设置钢筋混凝土结构的溢洪道阶梯式排洪。为解决模袋坝上的溢洪道在排洪过程中可能出现不均匀沉降引起的开裂问题，将溢洪道整体设计成多个Z型板自由搭接的实用新型结构，能很好地适应模袋坝沉降变形，该实用新型成果可为类似工程的排洪设计提供借鉴。

Application analysis on new utility drainage mode in tailings pond expansion project

A tailings pond adopts a geofabriform method for raising and capacity expansion, the existing flood control infrastructure can not meet flood discharge requirements after capacity expansion, and the existing flood discharge methods need to be improved. According to characteristics of the tailings pond expansion scheme, through comparison of the stepped and zoned flood discharge methods, and after analysis of the aspects of flood discharge safety, construction difficulty, construction period, operation management, and project cost, it is determined to adopt the stepped flood discharge of spillway with the reinforced concrete structure on new geofabriform dam in the tailings pond. To solve the problem that the spillway on a geofabriform dam may crack due to uneven settlement during flood discharge, the spillway is designed as a practical new structure with multiple Z-shaped plates freely overlapped, which can well adapt to the settlement deformation of the geofabriform dam. The utility model achievements provide a reference for flood discharge design of similar projects.