Inverted Siphon Research Articles

Design and Research of Digital Twin Construction Platform Based on Xiazhuang Inverted Siphon Project

Design and Research of Digital Twin Construction Platform Based on Xiazhuang Inverted Siphon Project

Seismic Response and Damage Analysis of Large Inverted Siphon Structure

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.

Calculation And Analysis Of Gully-Buried Prestressed Inverted Siphon Structure

Inverted siphon is a kind of cross-channel building, in order to study the stress distribution law of the buried prestressed inverted siphon structure. The force and deformation characteristics of Xinanpu inverted siphon are analysed by finite element software. In the establishment of finite element calculation model, the arrangement of inverted siphon prestressed reinforcement and the setting of pier are considered. A separate reinforcement calculation model is used to simulate the effect of prestressed reinforcement by applying initial strain, the boundary condition of inverted siphon structure is simulated by the fixed constraint between inverted siphon and pier. By numerical simulation analysis of inverted siphon structure, the cloud maps of stress and displacement and path charts of inverted siphon under various cases are given, then the results are analysed to check the safety performance of inverted siphon, the research results provide a theoretical basis for construction organisation design.

Моделирование дюкера с воздушной подушкой

The article considers the problem of silting-up of sewage inverted siphons. A review of modern methods of hydraulic flushing is presented. To ensure reliable and energy-efficient operation of the inverted siphon, it is proposed to use the air cushion effect. To ensure the stable operation of the structure, a simulation of the inverted siphon installation was performed, consisting of two sections with nodes for receiving runoff from the drop risers, a node that provides water removal and a node for regulating the pressure in the air cushion. As a result of the simulation, there has been obtained the distribution of the volume fraction of the water phase and the gas phase, the pressure distribution in the horizontal and vertical inverted siphon pipelines and the values of the flow velocity during the formation of the air cushion. The use of separation partition walls at the ends of horizontal siphon pipelines allows creating autonomous air cushions and regulating the work for each section separately. The adaptation of the air cushion inverted siphon technology in relation to the main sewer system is considered to be promising.

Calculation and analysis of gully-buried prestressed inverted siphon structure

Calculation and analysis of gully-buried prestressed inverted siphon structure

Application of Model Predictive Control for Large-Scale Inverted Siphon in Water Distribution System in the Case of Emergency Operation

The emergency control of Menglou~Qifang inverted siphon, which is about 72 km long, is the key to the safety of the Northern Hubei Water Transfer Project. Given the complicated layout of this project, traditional emergency control method has been challenged with the fast hydraulic transient characteristics of pressurized flow. This paper describes the application of model predictive control (MPC), a popular automatic control algorithm advanced in explicitly accounting for various constraints and optimizing control operation, in emergency condition. For the fast prediction to the pipe-canal combination system, a linear model for large-scale inverted siphon proposed by the latest research and the integrator-delay (ID) model for open canals are used. Simulation results show that the proposed MPC algorithm has promising performance on guaranteeing the safety of the project when there are sudden flow obstruction incidents of varying degrees downstream. Compared with control groups, the peak pressure can be reduced by 17.2 m by MPC under the most critical scenario, albeit with more complicated gates operations and more water release (up to 9.75 × 104 m3). Based on the linear model for long inverted siphon, this work highlights the applicability of MPC in the emergency control of large-scale pipe-canal combination system.

Linear model of water movements for large-scale inverted siphon in water distribution system

Abstract This paper proposes a linear model that relates the pressure head variations at the downstream end of an inverted siphon to the flow rate variations at two ends. It divides the pressure head variations in the inverted siphon into low-frequency part and high-frequency part. The two parts are caused by the deformation of the siphon wall and the reflection of acoustic wave, respectively. In order to build a simplified relation between wall deformation and low-frequency pressure head variations, the Preissmann slot method (PSM) is adopted in this paper. The linear model can also be used in other forms of structures, such as pipes and tunnels, where a pressurized flow condition is present. In comparison with simulation results using the finite volume method, the linear model shows an L2 norm of 0.177 for a large-scale inverted siphon and 0.044 for a PVC pipe. To this end, the linear model is adopted to model a large-scale inverted siphon in a virtual water delivery system. Simulation results show that the inverted siphon can reduce water fluctuations. An equation to quantify this effect is proposed based on the linear model.

The Response Property of Inverted Siphon in Long Distance Water Distribution System

In order to design controllers for canals with inverted siphon especially for very long siphon, it is necessary to learn its response property. Compared to open canals, the water movement in inverted siphon is very different due to the fast travelling speed of wave and high water pressure. It is impossible to use openchannel model describe invert siphon section, and the delay caused by the siphon haven’t been discussed in existing literature. This paper proposes a response model of inverted siphon which contains a delay and an integrator in low frequencies, a constant gain in high frequencies. By comparing the response model to the results of simulation, this paper shows the response model is a good approximation. This paper studies a water distribution project consists of two canals and one inverted siphon. The result shows that the water level change at downstream end is significantly smaller than water change at upstream end. By applying response model of inverted siphon, this paper shows it is due to the delay of flow rate change from upstream end to downstream end.

Numerical study of Tallinn storm-water system flooding conditions using CFD simulations of multi-phase flow in a large-scale inverted siphon

The numerical experiments are carried out for qualitative and quantitative interpretation of a multi-phase flow processes associated with malfunctioning of the Tallinn storm-water system during rain storms. The investigations are focused on the single-line inverted siphon, which is used as under-road connection of pipes of the storm-water system under interest. A multi-phase flow solver of Computational Fluid Dynamics software OpenFOAM is used for simulating the three-phase flow dynamics in the hydraulic system. The CFD simulations are performed with different inflow rates under same initial conditions. The computational results are compared essentially in two cases 1) design flow rate and 2) larger flow rate, for emptying the initially filled inverted siphon from a slurry-fluid. The larger flow-rate situations are under particular interest to detected possible flooding. In this regard, it is anticipated that the CFD solutions provide an important insight to functioning of inverted siphon under a restricted water-flow conditions at simultaneous presence of air and slurry-fluid.

Engineering Design and Recheck Computation of Trench-Buried Inverted Siphon

This paper provides design scheme for Guodi river trench-buried inverted siphon engineering, and universal finite element calculation software is adopted to carry out force analysis inverted siphon, researching variation law of the inverted siphon’s stress and displacement in operating process. The calculation results further shown design scheme’s rationality and safety, this provide the reliable basis for engineering design.

Study on Structure Analysis of Prestressed Reinforced Concrete Inverted Siphon

This paper adopt universal finite element calculation software to carry out force analysis for Shayubeigou prestressed reinforced concrete inverted siphon,computer is applied in analysis of prestressed reinforced concrete inverted siphon. Deducing variation law of the inverted siphons stress and displacement in construction process and operating process. The calculation results further shown design schemes rationality and safety. which provide reliable reference of design and construction for the prestressed reinforced concrete inverted siphon.

Application of Finite Element Method for Prestressed Reinforced Concrete Trench-Buried Inverted Siphon Analysis

This paper adopt universal finite element calculation software to carry out simulation analysis for Jinliang river of Mianyou canal trench-buried inverted siphon. Deducing variation law of the inverted siphons stress and displacement in construction process and operating process. The calculation results further shown design schemes rationality and safety. Which provide reliable reference of design and construction for the trench-buried inverted siphon.

Recheck Calculation of Dahedong Trench-Buried Inverted Siphon Structure

Inverted siphon structure is a common water conveyance buildings, computer as a efficient computational tool is used, this paper adopt finite element method to carry out three-dimensional finite element simulation analysis for Dahedong inverted siphon structure. Deducing variation law of the inverted siphons stress and displacement in construction process and operating process. Analysis results further verified that design scheme is reasonable and safe, it has certain application value.

Force Analysis of Qiaoshitan Reinforced Concrete Inverted Siphon

This paper adopts finite element software to carry out finite element force analysis for Qiaoshitan reinforced concrete inverted siphon engineering. Researching distribution laws of stress and deformation for inverted siphons typical sections and paths under various cases in construction and operating process. Research results provide reliable theory references for safe operation of Qiaoshitan reinforced concrete inverted siphon engineering.

A brief discussion on the design idea of improving the durability of large inverted siphon structure in corrosive environment

A brief discussion on the design idea of improving the durability of large inverted siphon structure in corrosive environment

Research on Finite Element Analysis of Nanping Inverted Siphon Engineering

This paper adopts universal finite element calculation software to carry out force analysis for Nanping trench-buried inverted siphon,computer is applied in analysis of trench-buried inverted siphon. Deducing variation law of the inverted siphons stress and displacement in construction process and operational process. The calculation results further shown design schemes rationality and safety. which provide reliable reference of design and construction for the trench-buried inverted siphon.

Analysis and Research of Luo River Inverted Siphon Structure

This paper adopts general finite element software to analyse Luo River bridge-type inverted siphon structure, researching variation law of the inverted siphons stress and displacement in construction process and operational process. Research results further verified rationality and security of the design scheme, which provides reliable reference for construction and operational of inverted siphon structure.

Simulation Analysis of Bridge-Type Reinforced Concrete Inverted Siphon

This paper adopts finite element software to carry out finite element simulation analysis for Wenjiawan reinforced concrete inverted siphon engineering. Researching distribution laws of stress and deformation for inverted siphons typical sections and paths under various cases in construction and operating process. Research results provide reliable theory references for safe operation of Wenjiawan reinforced concrete inverted siphon engineering.

Structure Force Analysis of Kongzou River Trench-Buried Inverted Siphon

nverted siphon structure is a common water conveyance buildings, computer as a efficient computational tool is used, this paper adopts finite element method to carry out three-dimensional finite element simulation analysis for Kongzou river trench-buried inverted siphon structure. Deducing variation law of the inverted siphons stress and displacement in construction process and operational process. Analysis results further verified that design scheme is reasonable and safe, it has certain reference value.

Finite Element Analysis of Tianerya Trench-Buried Inverted Siphon

This paper adopts universal finite element calculation software to carry out finite element analysis for Tianerya trench-buried inverted siphon. Researching variation law of the inverted siphons stress and displacement in construction process and operational process. The calculation results further shown design schemes rationality and safety. The analysis results provide a certain reference for design of trench-buried inverted siphon structure.