Safety of small and medium dams in permafrost regions

作     者：Rudolf V.Zhang Sergey A.Velikin 

作者机构：Melnikov Permafrost Institute Siberian Branch of the Russian Academy of SciencesYakutsk 677010 Russia Vilyui Permafrost Research Station Melnikov Permafrost Institute Siberian Branch of the Russian Academy of SciencesChernyshevsky 678185 Russia 

出 版 物：《Research in Cold and Arid Regions》 (寒旱区科学（英文版）)

年 卷 期：2014年第6卷第4期

页      面：331-339页

核心收录：

学科分类：081504[工学-水利水电工程] 08[工学] 0815[工学-水利工程] 

主　　题：permafrost dam safety hydraulic structure geocryological process safety criteria safety declaration 

摘      要：Safe operation and performance of dams is one of the key issues in permafrost regions. At present, the existing dams are 40–45 years old and they are reaching their design life limit. Intensive geocryological processes（thermokarst, thermal erosion, frost heaving, suffosion, concentrated seepage along the voids left by melt ice and others） begin to develop at the early stages of construction. These processes are even more intensive under severe climatic conditions of the permafrost zone due to the large thermal and moisture gradients and the resulting complex thermal stress-strain state in the structures. Determining safety criteria is a critical and difficult task in dam safety management. The existing procedures need to be continuously refined and improved depending on dam importance class. Some researchers recommend introducing process development criteria（stability, destabilization, and extremality） for more objective assessment of dam safety, in addition to the existing two condition criteria. In other words, they call for a multi-factor dam – environment interaction system. A case study of safety declaration for an existing dam is presented.