Simulation Calculation and Construction Control of Xiaolan Channel Super Large Bridge

2013 ◽  
Vol 655-657 ◽  
pp. 1893-1896
Author(s):  
Jun Jiang ◽  
Hong Ye Gou ◽  
Jun Ming Wang
Keyword(s):  
High Speed ◽  
Control Method ◽  
Three Dimensional ◽  
Calculation Model ◽  
Construction Control ◽  
Construction Process ◽  
Railway Line ◽  
Whole Process ◽  
Simulation Calculation ◽  
Control Research

Xiaolan channel super large bridge is a stucture type adopted in the passenger dedicated railway line for the first time, and the longest span bridge of the passenger dedicated railway line, also the longest span bridge of the high-speed railway in the world with a total length of 7686.57m.. At first, the author compiles APDL command flow program by using the unit birth-death technique, establishes simulation calculation model in the construction process. The creep characteristics of concrete are also taken into account. The whole process of beam first-to-arch later stage construction are calculated and studied. Simulation Calculation and construction control research of Xiaolan channel super large bridge shows that construction control method is reasonable, the calculation program which is used in the paper is right, and using three dimensional substantiality finite element method and “element birth and death” to simulate construction process conform to reality. The bridge is safe in the construction of beam first and arch late.

Study on Spatial Mechanical Characteristic of High-Speed Railway Ballastless Slab Track on Subgrade

2012 ◽  
Vol 503-504 ◽  
pp. 1010-1015 ◽  
Author(s):  
Qing Yuan Xu ◽  
Bin Li
Keyword(s):  
Temperature Gradient ◽  
Mechanical Characteristic ◽  
High Speed ◽  
Three Dimensional ◽  
Calculation Model ◽  
Slab Track ◽  
Combined Load ◽  
Railway Line ◽  
Spring Element ◽  
Ballastless Track

By using beam element to model rail, spring element to model fastener, solid element to model different components of ballastless track, contact element to model the connection between each component of ballastless track, a statics three-dimensional nonlinear finite element mechanical model for calculating the forces transmission among rail, fastening and different component of ballastless slab track on subgrade was established. Experimental data of Suining-Chongqing railway line was given to validate the calculation model. Force of ballastless slab track on subgrade under gravity load, train load, uneven settlement load, temperature gradient load as well as combined load was analyzed. Results show that: spatial forces characteristic of ballastless slab track is very notable under train load; uneven settlement load as well as temperature gradient load has significant influence on the mechanical characteristic of ballastless slab track; force of ballastless slab track increases significantly under combined load than that of under any single load.

Study on the Construction Control of Long-Span V-Shape Rigid Frame Composite Arch Bridges

2011 ◽  
Vol 255-260 ◽  
pp. 1043-1047
Author(s):  
Hong Ye Gou ◽  
Qian Hui Pu ◽  
Jun Ming Wang ◽  
Guo Wei Hu ◽  
Ze Yu Chen
Keyword(s):  
Structural Alignment ◽  
Internal Force ◽  
Constant Load ◽  
Calculation Model ◽  
Construction Control ◽  
Whole Process ◽  
Long Span ◽  
Rigid Frame ◽  
Simulation Calculation ◽  
Arch Bridges

The construction scheme of long-span V-shape rigid frame composite arch bridge is discussed. In process of simulation calculation of the construction, the author compiles APDL command flow program by using the unit birth-death technique, establishes simulation calculation model in the construction process. The creep characteristics of concrete are also taken into account. The whole process of beam first-to-arch later stage construction are calculated and studied.By researching on construction control of Xiaolan channel super large bridge, the feasibility of the construction program is evaluated, the alignment and displacement in each construction ideal state are determined and the alignment and displacement in the following construction state are predicted. The stress controling results of the critical sections are researched on to make the construction go along well as designed, make sure the safety during construction, the structural internal force under constant load and structural alignment are complied with the design requirements and the construction quality and safety are ensured.

scholarly journals Impacts of a railway tunnel on the streams baseflow verified by means of numerical modelling

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Leonardo Piccinini ◽  
Valentina Vincenzi
Keyword(s):  
Numerical Modelling ◽  
High Speed ◽  
Three Dimensional ◽  
Tracer Tests ◽  
Maximum Flow ◽  
Mitigation Strategies ◽  
Railway Tunnel ◽  
Flow Measurements ◽  
Railway Line ◽  
The Impact

The high-speed railway line between Bologna and Florence (Italy) is mostly developed underground through the Tuscan-Emilian Apennine, and the tunnels severely impacted groundwater and surface water. The 15-km-long Firenzuola tunnel crosses siliciclastic turbidites: during drilling, water inrushes occurred at fault and fracture zones, and the tunnel continues to drain the aquifer. The water table dropped below the level of the valleys, and gaining streams transformed into losing streams or ran completely dry, as did many springs. Hydrological observations and two multitracer tests have previously characterized the stream-tunnel connections and the impact processes. In the framework of planning mitigation strategies to minimize impacts on stream baseflow, three-dimensional numerical modelling with MODFLOW (the EPM approach) is applied to evaluate the artificial minimum flow needed to maintain flow continuity along the stream during the recession phase. The establishment of the two presented models is based on hydrogeological monitoring data and the results of flow measurements and tracer tests. Maximum flow rates subtracted from stream baseflow by the tunnel along the connection structures are calculated for two streams with major impacts.

Aerodynamic Comfort Analysis of High-Speed Trains Passing each other at the same Speed through a Tunnel

2011 ◽  
Vol 90-93 ◽  
pp. 2147-2151
Author(s):  
Ya Guang Yan ◽  
Qing Shan Yang ◽  
Jian Zhang
Keyword(s):  
High Speed ◽  
Three Dimensional ◽  
Pressure Change ◽  
Unsteady State ◽  
Transient Pressure ◽  
Tunnel Length ◽  
Simulation Calculation ◽  
Aerodynamic Effect ◽  
High Speed Trains ◽  
Volume Method

On the basis of the three-dimensional,compressible,unsteady-state,viscous N-S Equation and k-ε turbulence model,the simulation calculation is made with the finite volume method on the aerodynamic effect of two high-speed trains passing each other at the same speed through a tunnel,simulating the pressure change,analysising regularity of the pressure,researching comfort in the train.The following conclusions have been drawn from research:The maximum of transient pressure is concerned with the meeting point,when the two high-speed trains meet in tunnel.When the length,the speed and the sealing factor of the train are same,the transient pressure is maximum with the trains meeting at the midpoint of tunnel.When the tunnel length,the speed of the train,the sealing factor and the point of meeting are same,the transient pressure of the longer train is maximum.When the sealing factor is greater than 15s,the standard of permissible pressure (1250Pa\3s) can be satisfied with all circumstances.

Characteristics of Settlement and Assessment Methods of Engineered Structures under Certain High-Speed Railway Tracks in China

2012 ◽  
Vol 446-449 ◽  
pp. 1869-1879
Author(s):  
Shi Guo Xiao ◽  
Qing Rong Yan ◽  
Wen Chen
Keyword(s):  
High Speed ◽  
Construction Process ◽  
Small Magnitude ◽  
High Speed Railway ◽  
Railway Line ◽  
Railway Tracks ◽  
Analysis Methods ◽  
Predictive Methods ◽  
Engineered Structures ◽  
Line Construction

The assessment of settlement deformation of engineered structures under high-speed railway tracks is an important control link in high-speed railway line construction. This paper discusses characteristics of settlement deformation of sections of subgrade, bridges and tunnels, and analyzes the suitability of predictive methods in currently available technical codes and standards based on measured data of settlement deformation. Currently available assessment analysis methods have good applicability for subgrade sections but are not suitable for sections of bridges and tunnels. Suitable assessment analysis methods are proposed and have been successfully applied to settlement deformation of engineered structures under the tracks of high-speed railway lines. The methods suit the characteristics of “small magnitude and large fluctuation” changes of measured settlement deformations taking account of the construction process of the engineered project.

Rigidity calculation model for transverse joint of prefabricated utility tunnel based on physical guidance

2021 ◽  
pp. 62-73
Author(s):  
Tang Ruihua ◽  
◽  
Ding Weimin ◽  
Qian Yun ◽  
◽  
...  
Keyword(s):  
Flexural Rigidity ◽  
Three Dimensional ◽  
Internal Force ◽  
Calculation Model ◽  
Shear Rigidity ◽  
Three Dimensional Model ◽  
Whole Process ◽  
Transverse Joint ◽  
Utility Tunnel ◽  
Loading Methods

The rigidity calculation model for transverse joint of prefabricated utility tunnel is established by Midas FEA software based on physical guidance.Taking the prefabricated multi-utility tunnel of South Kemugong road of Guangzhou Intelligent City as the experimental object, the position of its transverse joint is analyzed from the aspects of construction and internal force. Midas FEA is used to establish and analyze the three-dimensional model for the transverse joint of the utility tunnel, and the calculation parameters, boundary conditions and loading methods of the materials are obtained, so that the calculation models for the bending and axial rigidity of the transverse joint are established.The results show that the theoretical calculation value of the model is consistent with the experimental value, and it can accurately describe the deformation and internal force state of the joint in the whole process of stress. The shear rigidity of the transverse joint is 3.524×106 kN/m and the flexural rigidity of transverse joint is 1.001×105 kN×m/rad under the condition of 500 kN/m horizontal axial force per linear meter.

Passive boundary layer control of oblique disturbances by finite-amplitude streaks

2014 ◽  
Vol 749 ◽  
pp. 1-36 ◽  
Author(s):  
Shahab Shahinfar ◽  
Sohrab S. Sattarzadeh ◽  
Jens H. M. Fransson
Keyword(s):  
High Speed ◽  
Passive Control ◽  
Control Method ◽  
Three Dimensional ◽  
Finite Amplitude ◽  
Transition To Turbulence ◽  
Spanwise Direction ◽  
Passive Flow Control ◽  
Tollmien Schlichting ◽  
Streamwise Streaks

AbstractRecent experimental results on the attenuation of two-dimensional Tollmien–Schlichting wave (TSW) disturbances by means of passive miniature vortex generators (MVGs) have shed new light on the possibility of delaying transition to turbulence and hence accomplishing skin-friction drag reduction. A recurrent concern has been whether this passive flow control strategy would work for other types of disturbances than plane TSWs in an experimental configuration where the incoming disturbance is allowed to fully interact with the MVG array. In the present experimental investigation we show that not only TSW disturbances are attenuated, but also three-dimensional single oblique wave (SOW) and pair of oblique waves (POW) disturbances are quenched in the presence of MVGs, and that transition delay can be obtained successfully. For the SOW disturbance an unusual interaction between the wave and the MVGs occurs, leading to a split of the wave with one part travelling with a ‘mirrored’ phase angle with respect to the spanwise direction on one side of the MVG centreline. This gives rise to $\Lambda $-vortices on the centreline, which force a low-speed streak on the centreline, strong enough to overcome the high-speed streak generated by the MVGs themselves. Both these streaky boundary layers seem to act stabilizing on unsteady perturbations. The challenge in a passive control method making use of a non-modal type of disturbances to attenuate modal disturbances lies in generating stable streamwise streaks which do not themselves break down to turbulence.

The Applicable Development of Steel-Construction Process Dynamic Visual Simulation Software

2014 ◽  
Vol 501-504 ◽  
pp. 2567-2570
Author(s):  
Hua Jiang ◽  
Liang Tong ◽  
Yang Qiuye Gao
Keyword(s):  
Three Dimensional ◽  
Simulation Software ◽  
Visual Simulation ◽  
Construction Project Management ◽  
Construction Process ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Whole Process ◽  
Rapid Construction ◽  
Management Project

In this paper, steel-trussed bridging method is combined with the whole process of the construction-management project with an aim to develop a visual simulation software, whose database requires a three-dimensional model of dynamic visual simulation. This application can quickly realize the rapid construction of various types of data and retrieval data-management digitization. The software system achieves the management visualization of various types of integrated data, which are easy to use, intuitive to understand. The system is suitable for all types of steel works automation and some refinement of modern construction project management.

Analysis of the Construction of New Metro Impact on the Existing Subway Station

2014 ◽  
Vol 1030-1032 ◽  
pp. 1966-1969
Author(s):  
Sheng Jun Miao ◽  
Guan Lin Huang ◽  
Fei Chen ◽  
Li Chao Shi
Keyword(s):  
Three Dimensional ◽  
Calculation Model ◽  
Subway Station ◽  
Construction Process ◽  
Ansys Software ◽  
Stress Variation ◽  
Main Structure ◽  
Construction Scheme ◽  
Building Project ◽  
Station Structure

Taking a new subway going through under the existing subway station as the engineering background, based on geological exploration data in the field, the deformation influence for the station structure of the existing subway when the main structure station constructs could be studied. It constructed a three dimensional calculation model by Ansys software to simulate the transverse and vertical deformation and the stress variation of new building line station's main structure, Through the analysis of the results,it put forward the predictive analysis to control the risk. To ensure the safety in construction process through adjust the construction scheme timely. It provided the corresponding reference for the such subway building project.

Application of Virtual Reality Technology in Construction Control and Management

2013 ◽  
Vol 427-429 ◽  
pp. 2851-2854 ◽  
Author(s):  
Yu Ping Qin
Keyword(s):  
Virtual Reality ◽  
Three Dimensional ◽  
Advanced Technology ◽  
Construction Control ◽  
Construction Process ◽  
Virtual Reality System ◽  
Virtual Reality Technology ◽  
Engineering Construction ◽  
Virtual Construction ◽  
Control And Management

The virtual reality is an advanced technology in the modern man-made environment. A three-dimensional virtual reality world is produced by computer simulation to make users feel as if they were personally on the scene. By building the virtual model and virtual construction process, construction control and management based on the virtual reality system can be used to improve efficiency of project management and construction, ensure construction progress, save cost, improve safety and reduce engineering risk, so as to provide guidance for engineering construction.

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