Affiliation:
1. Department of Civil & Environmental Engineering, Dongguk University, Seoul 04620, Republic of Korea
2. Department of Civil & Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
Abstract
The Sliding Safety Factor (SSF) is a crucial criterion for the sliding stability evaluation of concrete dam structures. A concrete gravity dam subjected to strong earthquakes undergoes progressive fractures, in addition to pre-existing fractures, at the dam–foundation interface, which causes a reduction in the shear strength against sliding. In this study, a new SSF is suggested to take account of the progressive fractured area at the dam–foundation interface. A contact and sliding model for the dam–foundation system is also suggested to compute the dynamically varying normal forces and sliding motions for the suggested SSF. To investigate the effect of the progressively fractured area on the sliding safety evaluation, the conventional, improved, and newly suggested SSFs are compared using the dynamic seismic analysis results of a concrete gravity dam. The conventional formulation of the SSF, in which the fractured area is not represented, yields extremely overestimated sliding safety judgements when a dam is subjected to strong earthquakes. On the other hand, the newly suggested SSF with the proposed contact–sliding model provides more realistic and conservative sliding safety evaluation results than the others.
Funder
Basic Science Research Program through the National Research Foundation of Korea
Ministry of Education
Subject
Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science
Reference32 articles.
1. Wang, S., Xu, B., Zhu, Z., Li, J., and Lu, J. (2022). Reliability Analysis of Concrete Gravity Dams Based on Least Squares Support Vector Machines with an Improved Particle Swarm Optimization Algorithm. Appl. Sci., 12.
2. Earthquake response of concrete gravity dams including base sliding;Fenves;J. Struct. Eng.,1995
3. Stability of straight Concrete Gravity Dams;Henry;Trans. ASCE,1933
4. Nicholson, G.A. (1983). Design of Gravity Dams on Rock Foundations: Sliding Stability Assessment by Limit Equilibrium and Selection of Shear Strength Parameters, Army Engineer Waterways Experiment Station. Technical Report GL-83-13.
5. Headquarters, U.S. (2005). Army Corps of Engineers. Stability Analysis of Concrete Structures, U.S. Army Corps of Engineers. EM 1110-2-2100.