Water level behavior evaluation in upstream tailing dam

摘要

Among the main building methods of railings dams,the upstream method is undoubtedly the most vulnerable to the occurrence of the failure originated by the power of seepage groundwater through the embankment. In a reservoir-dam system having low cohesion slimes,such as tailings dams,the power of seepage groundwater benefits the installation of internal erosive processes of piping and liquefaction,the most responsible for the failure already registered. For reduction of failure risks in tailings dams built through upstream method,the assessment of water level behavior must be constant. In this context,the survey presents an instrumental and monitored program composed by piezometer,rainy,downstream outlet,reservoff level of water measures and benchmark providing the increase of safety in these works.The execution of a methodological procedure based on the instrumental and monitored program above mentioned makes possible the assessment of water level behavior in these dams. Relevant aspects for correlation of instrumental data with the limit-values defined for the project are described,meaningful criterion for the success of an instrumental program. Therefore,the methodological procedure showed efficiency in the obtain of indispensable patterns for the water level variation accompaniment and its behavior forecast according to the embankment foundation.