Seismic Response and Damage Analysis of Large Inverted Siphon Structure

Abstract

Large-scale inverted siphon is a key hydraulic structure for building a national water network and realizing the spatial balance of water resources, and its safety under the action of earthquakes has become the focus of trans-basin water transfer projects. In this paper, Xiazhuang inverted siphon of water diversion in Central Yunnan is taken as the research object. Viscoelastic artificial boundary was used to simulate seismic waves spread in the soil, which include the natural site seismic waves and the waves fitted manually according to the site conditions. A three-dimensional finite element model of soil-structure-fluid interaction was established by software of ABAQUS, in which the fluid-structure interaction was simulated by user-defined element (UEL) built on additional Mass Method. Seismic response and damage analysis of large inverted siphon structure are carried out by the model. The results show that the dynamic displacement of the inverted siphon pipe is mainly horizontal sloshing, and the dynamic response of the pipe increases due to the water in the pipe; even the dynamic stress value in some areas is close to the design value of the concrete tensile strength. The damage analysis of inverted siphon pipe shows that the plastic deformation and the damage area develop rapidly with the increase of the peak ground acceleration (PGA), and the tensile damage area is generally larger than the compression damage area. The damage factor of the pipe under the working condition of the water is obviously larger relative to the working condition of no water. Therefore, it is suggested that the damage effect of earthquake should be considered in the design of large inverted siphon in high-intensity area.

Structure Modelling of Underground Structure for Faults and Failure Detection Using Sesmic Condition

“…Ground improvement measures, including soil densification, grouting, and slope stabilization, may be implemented to mitigate the effects of liquefaction, landslides, and fault rupture. During the construction phase, appropriate techniques and methodologies are employed to minimize ground disturbances and control groundwater [19]. The installation of monitoring systems allows for continuous assessment of the tunnel's performance and the surrounding ground during seismic events.…”

Summary of Research on Seismic Vulnerability of Tunnel Structures

“…Luo Gang [6] generated consistent ground shaking based on the triangular level method and wave loads based on wave theory for the seismic performance of suspension tunnels under the coupled action of earthquakes and waves. Shi [7] established a soil-structure-fluid interaction model for an inverted siphon pipe based on the additional mass method. Consistent seismic waves were fitted artificially according to the site conditions, and the seismic response and damage analysis were performed for large inverted siphon structures to investigate the degree of damage in various parts of the pipe under different seismic intensities.…”