关键词: 粗粒料, 防渗体系, 土石坝安全, 特高土石坝

Abstract: With the rapid progress of water resources utilization, a series of High Earth and Rockfill Dams (HERDs) higher than 200 m are being built or to be built at the sites with increasingly complex construction conditions and severe operation environments. Successful construction and long-term safety of these super-HERDs are of great importance to national economic growth, social development and public security. In this paper, theoretical and technological challenges to be faced during the construction and long-term operation of HERDs are analyzed. The key scientific and technological issues involved are put forward, and the important issues that deserve great research efforts are pointed out. Multi-scale experiments with coarse dam materials and structures, back analyses of dam behavior using monitoring data and development of advanced numerical methods should be performed to study the scale effect in testing coarse granular materials, the deformation and failure of interfaces, and the long-term performance of impervious systems within dams. By doing these works, the long-term safety evaluation theory can be established for super-HERDs, so as to improve the accuracy of deformation and seepage predictions. New structures, materials, equipment and criteria should be developed to solve the deformation compatibility problems and anti-seepage problems for HERDs in complex canyon conditions and severe operation environments. Innovation in these areas will form the technological systems for constructing super-HERDs under increasingly complex conditions. Advanced satellite remote sensing techniques and safety evaluation criteria should be introduced into the online monitoring platform for reservoirs and dams, with the aim of realizing real-time monitoring, risk warning, information publication and emergency treatment for super-HERDs. Fulfillment of the above goals will take a further step forward to improve the levels of construction and long-term safety assurance for super-HERDs.

Key words: coarse granular materials, anti-seepage system, safety of earth and rockfill dams, super-high earth and rockfill dams