两河口水电站多源复杂防渗土料勘察研究

Investigation and Research on Multi-source Complex Impervious Soil Material in Lianghekou Hydropower Project

两河口水电站是已完建的世界第二高土石坝,大坝对心墙防渗土料的需求量大,质量要求高。防渗土料料源具有料源多、成因类型多、颗粒级配宽、物理力学性质差异大、土料不均一等工程地质问题,为此,设计院对防渗土料开展了系统的勘察研究,梳理和总结了一套两河口多源复杂防渗土料勘查评价体系。两河口工程实践表明:该勘察评价体系有效地解决了防渗土料面临的问题。目前大坝心墙变形、渗漏等监测成果表明,心墙防渗效果良好,大坝运行正常。

The dam in Lianghekou Hydropower Station is the second highest completed embankment dam in the world.The dam filling requires a large amount of high-quality impervious soil for the core wall.Geological problems such as the multi-source,multi-genesis,board gradation,mechanical property difference and nonuniformity exist in impervious soil material.In view of these problems,the design institute carried out systematic investigation and research on the impervious soil,and a set of investigation and evaluation system for multisource complex impervious soil material in Lianghekou Project was summarized and concluded.The practice in Lianghekou Project has proved that this system can effectively solve the problems mentioned above.Up to now,the impervious core wall and the dam work in good condition according to the monitoring data of deformation and seepage.