Investigation of Failure Mechanism in Earth Dam upon Triggered Liquefaction
Subject Areas :
Analytical and Numerical Methods in Mechanical Design
Farzad Peyman
1
1 - Department of Civil Engineering, QazvinBranch, Islamic Azad University Qazvin, Iran
Received: 2023-04-09
Accepted : 2023-04-09
Published : 2022-12-01
Keywords:
Liquefaction,
Earth-dam,
Elastic-plastic,
Multi-plane,
Abstract :
The behavior of the earth-dam body as a soil structure made of cohesive soil in the core and non-cohesive soil as the core supports, including water interaction upstream through earthquake upon multi-line constitutive equations, is the aim of this paper. A multi-plane mechanism-based approach is successfully employed for assigning post-liquefaction displacement of earth-dam structures. This approach is derived from total stress procedures with two major advantages:1) the triggering and post-liquefaction responses have been multi-lined into one analysis.2) the modeling of post-liquefaction element behavior is greatly improved.To sum up, a multi-plane-based framework is employed. The strength effects on integrated sampling planes and the resultant of this simulated multi-lined behavior are implemented for each finite element gauss point. This multi-plane-based model can also predict the effects of induced and inherent anisotropy plus the rotation of principal stress/strain axes through the plastic behavior of both cohesive and non-cohesive soils.The approach is presented through the simulation of the case history as the response of the lower San Fernando dam to the 1971 San Fernando earthquake. The magnitude and pattern of the predicted displacements are shown to be in good agreement with the measured values
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