A method of determining monitoring indexes for spatial deformation of super high arch dam based on extreme value theory

Abstract

In the long service of arch dam, deformation is one of the main performance parameters which can directly reflect the working behavior of the dam. In order to effectively monitor the safety of dam operation, it is necessary to determine the monitoring control value of deformation. The traditional dam deformation monitoring control values only consider the single point, ignoring the spatial correlation between the measurement points. In order to overcome this limitation, this paper focuses on the spatial distribution characteristics of deformation measuring points of the arch dam, then by building dam deformation field and using the Projection Pursuit Analysis (PPA) project high-dimensional data to low dimensional space. On this basis, the POT model proposed to determine the monitoring control values. The PPA-POT model is applied to practical engineering, and the feasibility and applicability of the method in this paper are tested by comparing with the traditional methods, so as to provide a new analysis technique for the long-term service status safety evaluation of arch dams.