古贤水利枢纽两种代表坝型土石方平衡比较

Earthwork Balance Comparison of Two Dam Type Schemes of Guxian Hydropower Project

土石方动态调配优化平衡是大型土石方工程施工的关键[1]。针对古贤水利枢纽如分别采用混凝土重力坝和混凝土面板堆石坝这两种不同坝型,进行了土石方等工程量的比较。混凝土面板堆石坝方案的土石方开挖量较大,扰动地表面积多373hm^2,产生的弃渣多3989万m^3,新增水土流失比重力坝方案多14.1万t,水土保持投资需增加20110万元。经综合其他因素考虑,推荐混凝土重力坝作为古贤水利枢纽工程的坝型。

The dynamic optimization and balancing of the earth and rock material allocation is the key to the construction of earthwork projects.In Guxian Hydropower Project, two dam type schemes, the concrete gravity dam and the concrete face rockfill dam, are considered.The earthwork balance of these two schemes are compared.The results show that the earthwork excavation work of the concrete face rockfill dam scheme is larger than the gravity dam scheme.The concrete face rockfill dam scheme will generate 373 hm^2 more disturbed ground surface area, 39.89 million m^3 more waste slag, 141,000 tons more soil erosion, and require extra 201.1 million yuan soil and water conservation investment.Therefore, the concrete gravity dam is recommended as the dam type for Guxian Hydropower Project.