The Analysis of Surface Subsidence Caused by Pipe Roof Reinforcement Method Construction in Hunhe Underdrain

2012 ◽  
Vol 256-259 ◽  
pp. 535-542
Author(s):  
Xiang Dong Zhang ◽  
Qing Wen Li ◽  
Xue Bing Gu ◽  
Gui Xiu Li
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Surface Subsidence ◽  
Constitutive Relationship ◽  
Stress And Strain ◽  
Nonlinear Finite Element Method ◽  
Finite Element Software ◽  
Coulomb Model ◽  
Element Theory ◽  
Method Construction

This paper is used to study on analysis and prediction of surface subsidence caused by pipe roof reinforcement method construction. Take one of the Shenyang's sewage disposal projects to be investigated, it monitored on field surface subsidence in construction of underdrain. During the measurement and monitoring, except for conventional measurement of surface subsidence according to code and peripheral convergence and so on, in order to analysis changes of stress and strain of the pipe roof in whole construction of underdrain. it respectively arranges JMZX-212 intelligent string type of strain gauge in both internal and external sides of vault and hance. It used the Element Birth/Death of finite element software basing on field data, using elastic-plastic and nonlinear finite element method. Material constitutive relationship used mohr-coulomb model, simulating process of tunnel of excavation and support, researching and stimulating surface subsidence. Value of surface settlement was calculated via numerical simulation in applying finite element theory, it based on prototype of engineering, which was in accord with measurement value in field. The correctness of soil constitutive model chosen and boundary conditions used is verified, meanwhile, numerical simulation shows validity of method.

The Bearing Capacity of Excavated Pile under Load Test and Finite Element Analysis

2012 ◽  
Vol 256-259 ◽  
pp. 388-393
Author(s):  
Feng Shan Hao ◽  
Ying Guo ◽  
Yu Huang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Surface Subsidence ◽  
Load Test ◽  
Constitutive Relationship ◽  
Element Analysis ◽  
Finite Element Software ◽  
Finite Theory ◽  
Coulomb Model ◽  
Method Construction

This paper is used to study on the analysis and prediction of surface subsidence caused by pipe roof reinforcement method construction. Take one of the Shenyang's sewage disposal projects to be investigated, it monitored on field surface subsidence in the construction of under drain. During the measurement and monitoring, except for conventional measurement of surface subsidence according to code and peripheral convergence and so on, in order to analysis changes of stress and strain of the pipe roof in the whole construction of under drain. It also respectively arranges JMZX-212 intelligent string type of strain gauge in both internal and external sides of vault and hence. It used the Element Birth/Death of finite element software basing on the field data, using elastic-plastic and nonlinear finite element method. Material constitutive relationship used moor-coulomb model, simulating the process of tunnel of excavation and support, researching and stimulating the surface subsidence. The surface settlement of value was calculated applying finite theory via the numerical simulation, it based on prototype of engineering, which was approximately in accord with the measured value in field. The correctness of soil constitutive model chosen and boundary conditions used is verified, meanwhile, the numerical simulation shows the validity of the method .the results provide reference to similar construction method in the future.

Analysis of Pipe-Soil Interaction for a Miniature Pipejacking

2006 ◽  
Vol 22 (3) ◽  
pp. 213-220 ◽  
Author(s):  
K. J. Shou ◽  
F. W. Chang
Keyword(s):  
Finite Element ◽  
Failure Mechanism ◽  
Physical Modeling ◽  
Driving Force ◽  
Numerical Models ◽  
Surface Subsidence ◽  
Finite Element Software

AbstractIn this study, physical and numerical models were used to analyze pipe-soil interaction during pipejacking work. After calibrating with the physical modeling results, the finite element software ABAQUS [1] was used to study the pipejacking related behavior, such as surface subsidence, failure mechanism, pipe-soil interaction, etc. The results show that the driving force in the tunnelling face is very important and critical for pipejacking. Surface subsidence is mainly due to the lack of driving force, however, excessive driving force could cause the unfavorable surface heaving problem. It also suggests that the depth of the pipe is critical to determine a proper driving force to stabilize the tunnelling face.

Multi-Step Forward Finite Element Method for the Numerical Simulation of Sheet Metal Forming

2011 ◽  
Vol 474-476 ◽  
pp. 251-254
Author(s):  
Jian Jun Wu ◽  
Wei Liu ◽  
Yu Jing Zhao
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Deep Drawing ◽  
Metal Forming ◽  
Mapping Method ◽  
Constitutive Relationship ◽  
Element Method

The multi-step forward finite element method is presented for the numerical simulation of multi-step sheet metal forming. The traditional constitutive relationship is modified according to the multi-step forming processes, and double spreading plane based mapping method is used to obtain the initial solutions of the intermediate configurations. To verify the multi-step forward FEM, the two-step simulation of a stepped box deep-drawing part is carried out as it is in the experiment. The comparison with the results of the incremental FEM and test shows that the multi-step forward FEM is efficient for the numerical simulation of multi-step sheet metal forming processes.

Nonlinear Dynamic Response of Buoys under the Collision Load with Ships

2012 ◽  
Vol 204-208 ◽  
pp. 4455-4459 ◽  
Author(s):  
Liu Hong Chang ◽  
Chang Bo Jiang ◽  
Man Jun Liao ◽  
Xiong Xiao
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Analysis Software ◽  
Element Analysis ◽  
Nonlinear Dynamic Response ◽  
Dynamic Finite Element ◽  
Simulation Results ◽  
Collision Force ◽  
Explicit Dynamic ◽  
Element Theory

The explicit dynamic finite element theory is applied on the collision of ships with buoys for computer simulation. Using ANSYS/LS-DYNA finite element analysis software, the numerical simulation of the collision between the ton ship and the buoy with different structures and impact points. The collision force, deformation, displacement parameters and the weak impact points of a buoy are obtained. Based on the numerical simulation results, analysis of buoys and structural collision damages in anti-collision features are discussed, and several theoretical sugestions in anti-collision for the design of buoy are provided.

scholarly journals Numerical simulation of blanking process

2018 ◽  
Vol 157 ◽  
pp. 02038
Author(s):  
Peter Pecháč ◽  
Milan Sága
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Steel Sheet ◽  
Plastic Material ◽  
Material Model ◽  
Rolled Steel ◽  
Finite Element Software ◽  
History Of ◽  
Cold Rolled ◽  
Blanking Process

This paper presents numerical simulation of blanking process for cold-rolled steel sheet metal. The problem was modeled using axial symmetry in commercial finite element software ADINA. Data obtained by experimental measurement were used to create multi-linear plastic material model for simulation. History of blanking force vs. tool displacement was obtained.

scholarly journals Development Trend and Stability Analysis of Creep Landslide With Obvious Slip Zone Under Rainfall-Taking Xinchang Xiashan Basalt Slope as an Example

2022 ◽  
Vol 9 ◽  
Author(s):  
Chunyan Bao ◽  
Lingtao Zhan ◽  
Yingjie Xia ◽  
Yongliang Huang ◽  
Zhenxing Zhao
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Stability Analysis ◽  
Soil Layer ◽  
Heavy Rain ◽  
Development Trend ◽  
Sliding Surface ◽  
Landslide Area ◽  
Finite Element Software ◽  
Sliding Zone

The creep slope is a dynamic development process, from stable deformation to instability failure. For the slope with sliding zone, it generally creeps along the sliding zone. If the sliding zone controlling the slope sliding does not have obvious displacement, and the slope has unexpected instability without warning, the harm and potential safety hazard are often much greater than the visible creep. Studying the development trend of this kind of landslide is of great significance to slope treatment and landslide early warning. Taking Xiashan village landslide in Huishan Town, Xinchang County, Zhejiang Province as an example, the landslide point was determined by numerical simulation in 2006. Generally, the landslide is a typical long-term slow deformation towards the free direction. Based on a new round of investigation and monitoring, this paper shows that there are signs of creeping on the surface of the landslide since 2003, and there is no creep on the deep sliding surface. The joint fissures in the landslide area are relatively developed, and rainfall infiltration will soften the soft rock and soil layer and greatly reduce its stability. This paper collects and arranges the rainfall data of the landslide area in recent 30 years, constructs the slope finite element model considering rainfall conditions through ANSYS finite element software, and carries out numerical simulation stability analysis. The results show that if cracks appear below or above the slope’s sliding surface, or are artificially damaged, the sliding surface may develop into weak cracks. Then, the plastic zone of penetration is offset; In the case of heavy rain, the slope can unload itself under the action of rainfall. At this time, the slope was unstable and the landslide happened suddenly.

Numerical Simulation of Inner Support for Excavation Based on FEM Software ABAQUS

2012 ◽  
Vol 236-237 ◽  
pp. 632-635
Author(s):  
Yue Sun ◽  
Yue Nan Chen ◽  
Zhi Yun Wang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Computational Model ◽  
Dimensional Space ◽  
General Purpose ◽  
Two Dimensional ◽  
Clay Layer ◽  
Finite Element Software ◽  
Spring Element

In two-dimensional space, an elasto-plastic finite element computational model was established to simulate inner support for excavation on the basis of the general-purpose finite element software ABAQUS. The soil was assumed to be a uniform and normally consolidated clay layer and strut was discreted by spring element. Compared with published case study, it can be concluded that FEM software AQAQUS can present one reliable simulation progress of inner support for excavation.

Numerical Simulation of the Kinetic Energy Projectile Oblique Penetration into the Concrete

2014 ◽  
Vol 989-994 ◽  
pp. 982-985
Author(s):  
Jun Chen ◽  
Xiao Jun Ye
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Kinetic Energy ◽  
Three Dimensional ◽  
Test Results ◽  
Destruction Process ◽  
3D Finite Element ◽  
Finite Element Software ◽  
Simulation Results ◽  
Target Characteristics

ANSYS-LS/DYNA 3D finite element software projectile penetrating concrete target three-dimensional numerical simulation , has been the target characteristics and destroy ballistic missile trajectory , velocity and acceleration and analyze penetration and the time between relationship , compared with the test results , the phenomenon is consistent with the simulation results. The results show that : the destruction process finite element software can better demonstrate concrete tests revealed the phenomenon can not be observed , estimated penetration depth and direction of the oblique penetration missile deflection .

Statics Analysis of Integral Impeller Based on Finite Element

2013 ◽  
Vol 753-755 ◽  
pp. 1124-1127
Author(s):  
Li Da Zhu ◽  
Shuai Xu ◽  
Wen Wen Liu ◽  
Ji Jiang Wu ◽  
Jian Shi ◽  
...  
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Stress And Strain ◽  
Total Deformation ◽  
Suction Surface ◽  
Maximum Deformation ◽  
Blade Tip ◽  
Tip Position ◽  
Element Theory ◽  
The Finite Element Model

Aim at the problem of machining integral impeller, a method of using finite element theory to carry out the statics analysis of impeller in this paper is studied. The finite element model is established, and then the nephogram of the impeller stress, strain and total deformation are obtained. The result is attained: in the case of impeller rotation and statics load, the maximum of stress and strain occur at the root of suction surface, the maximum of total deformation occurs on the blade tip position of suction surface, while the maximum deformation position has not changed, which increases with the increasing of rotation and statics load. The data results provide a theoretical reference for the machining of integral impeller.

Methods, Models, and Assumptions Used in Finite Element Simulation of a Pilger Metal Forming Process

2003 ◽  
Author(s):  
John Martin
Keyword(s):  
Finite Element ◽  
Process Parameters ◽  
Manufacturing Process ◽  
Defect Formation ◽  
Process Parameter ◽  
Stress And Strain ◽  
Finite Element Software ◽  
Sensitivity Studies ◽  
Modelling Techniques ◽  
Thin Walled

The pilger process is a cold-worked mechanical process that combines the elements of extrusion, rolling, and upsetting for the formation of thin-walled tubes. This complex manufacturing process relies on the results of trial and error testing programs, experimental parameter sensitivity studies, and prototypical applications to advance the technology. This finite element modelling effort describes the methods, models, and assumptions used to assess the process parameters used to manufacture thin-walled tubing. The modelling technique breaks down the manufacturing process into smaller computer generated models representing fundamental process functions. Each of these models is linked with the overall process simulation. Simplified assumptions are identified and supporting justifications provided. This work represents proof of principle modelling techniques, using large deformation, large strain, finite element software. These modelling techniques can be extended to more extensive parameter studies evaluating the effects of pilger process parameter changes on final tube stress and strain states and their relationship to defect formation/propagation. Sensitivity studies on input variables and the process parameters associated with one pass of the pilger process are also included. The modelling techniques have been extended to parameter studies evaluating the effects of pilger process parameter changes on tube stress and strain states and their relationship to defect formation. Eventually a complex qualified 3-D model will provide more accurate results for process evaluation purposes. However, the trends and results reported are judged adequate for examining process trends and parameter variability.

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