Study on Influencing Factors of Tunnel in Seismic Performance of Adjacent Underground Pipeline

2013 ◽  
Vol 807-809 ◽  
pp. 1823-1828
Author(s):  
Run Lin Yang ◽  
Jie Kong ◽  
Juan Hua Zhou
Keyword(s):  
Influencing Factors ◽  
Seismic Performance ◽  
Significant Influence ◽  
Relative Position ◽  
Axial Stress ◽  
Numerical Results ◽  
Underground Pipeline ◽  
Flexible Joint ◽  
Underground Pipelines

The existing tunnels may have an influence on seismic performance of adjacent underground pipelines. However, most of previous relevant studies are separately focused on seismic performance of the pipeline or the tunnel. In this paper, the major influencing factors of the existing tunnel in the seismic performance of adjacent underground pipelines, including joint types of the pipeline, the different angles and the distances between the pipeline and tunnel, were discussed. Numerical results show that flexible joint is the important factor which is helpful to decrease the settlement difference and the axial stress of the pipeline. Meanwhile, the relative position between the pipeline and the tunnel may also have a significant influence on seismic performance of pipelines.

Study on Influence of Tunnel Excavation on Seismic Performance of Underground Pipeline

2011 ◽  
Vol 90-93 ◽  
pp. 1801-1806
Author(s):  
Run Lin Yang ◽  
Tian Yuan Zhang
Keyword(s):  
Ground Motion ◽  
Seismic Performance ◽  
Seismic Action ◽  
Underground Pipeline ◽  
Buried Pipelines ◽  
Tunnel Excavation ◽  
Modeling And Analysis ◽  
Underground Pipelines ◽  
Earthquake Resistant ◽  
Before And After

It is often necessary to study on the seismic performance of the buried pipelines subjected to tunnel excavation, because the ground motion will inevitably endanger the nearby underground pipelines. In this paper, modeling and analysis of earthquake-resistant performance of tunnel excavation to the upper underground pipeline have been carried out. The changes of stress and displacement of the upper underground pipeline under action of the same seismic wave before and after tunnel excavation was compared. It is showed that there’s a greater impact on the stress and displacement of upper underground pipeline under seismic action, and a tunnel with reasonable supporting would support the underground pipeline to some extent.

The Influencing Factors and Assessment Rule of Fatigue Life of Shaft Based on Product Lifecycle Management

2007 ◽  
Vol 561-565 ◽  
pp. 2253-2256 ◽  
Author(s):  
You Tang Li ◽  
Ping Ma ◽  
Jun Tian Zhao
Keyword(s):  
Fatigue Life ◽  
Influencing Factors ◽  
Axial Stress ◽  
Assessment Method ◽  
Product Lifecycle Management ◽  
Product Lifecycle ◽  
Fatigue Design ◽  
Main Factors ◽  
Set Up ◽  
Lifecycle Management

Product lifecycle management is one of the main developmental aspects of advanced manufacturing technology. Anti-fatigue design is the key content in product lifecycle management. For designing the fatigue life of shaft exactly and determining the assessment method, the influencing factors must be realized roundly. The mechanical model of shaft is set up at first, and then the main factors that affect the fatigue life of shaft is discussed, the interrelations of the main factors and the framework are founded. The assessment equation of fatigue life for shaft is put forward and the influencing coefficient of multi-axial stress to fatigue life is analyzed. The results of this paper will establish the base of anti-fatigue and assessment life of shaft.

scholarly journals Study on droplet nucleation position and jumping on structured hydrophobic surface using the lattice Boltzmann method

2021 ◽  
pp. 149-149
Author(s):  
Gaojie Liang ◽  
Lijun Liu ◽  
Haiqian Zhao ◽  
Cong Li ◽  
Nandi Zhang
Keyword(s):  
Lattice Boltzmann Method ◽  
Significant Influence ◽  
Lattice Boltzmann ◽  
Hydrophobic Surface ◽  
Numerical Results ◽  
Nucleation Mode ◽  
Droplet Nucleation ◽  
Simulation Results ◽  
The Individual ◽  
Boltzmann Method

In this study, droplet nucleation and jumping on the conical microstructure surface is simulated using the Lattice Boltzmann Method (LBM). The nucleation and jumping laws of the droplet on the surface are summarized. The numerical results suggest that the height and the gap of the conical microstructure exhibit a significant influence on the nucleation position of the droplet. When the ratio of height to the gap of the microstructure(H/D) is small, the droplet tends to nucleate at the bottom of the structure. Otherwise, the droplet tends to nucleate towards the side of the structure. The droplet grown in the side nucleation mode possesses better hydrophobicity than that of the droplet grown in the bottom nucleation mode and the droplet jumping becomes easier. Apart from the coalescence of the droplets jumping out of the surface, jumping of individual droplets may also occur under certain conditions. The ratio of the clearance to the width of the conical microstructure(D/F) depends on the jumping mode of the droplet. The simulation results indicate that when the D/F ratio is greater than 1.2, the coalescence jump of droplets is likely to occur. On the contrary, the individual jump of droplets is easy to occur.

The Design and Establishment of 3D Urban Underground Pipeline Plan Aid System

2013 ◽  
Vol 475-476 ◽  
pp. 1546-1550
Author(s):  
Ying Chun Tao ◽  
Lian Zhao ◽  
Guo Jiang Zheng ◽  
Bo Gang Yang
Keyword(s):  
Decision Making ◽  
Normal Operation ◽  
Underground Pipeline ◽  
Planning Commission ◽  
Municipal Planning ◽  
Pipeline Network ◽  
Scene Graph ◽  
Underground Pipelines ◽  
The City ◽  
Modelling Process

Urban underground pipelines are the lifelines of the city. With the acceleration of city modernization, the traditional way to design and manage pipeline plans which relies on 2D diagrams has been difficult to secure the normal operation of the city. In this paper, a standard automatic 3D pipeline modelling process is proposed; a way to manage massive 3D scenes by scene graph is raised; three patterns of 3D integrated visualization are suggested; innovative stereo displays of pipeline analysis results are thought out. Eventually, a 3D urban underground pipeline plan aid system has been developed. At present, the system has been used in Xicheng Bureau of the Beijing Municipal Planning Commission, providing valuable decision-making information for urban underground pipeline network planning and management.

Public reporting on food safety incidents in China: intention and its determinants

2018 ◽  
Vol 120 (11) ◽  
pp. 2615-2630 ◽  
Author(s):  
Shijiu Yin ◽  
Ying Li ◽  
Yusheng Chen ◽  
Linhai Wu ◽  
Jiang Yan
Keyword(s):  
Food Safety ◽  
Influencing Factors ◽  
Significant Influence ◽  
Subjective Norm ◽  
Moral Norm ◽  
Descriptive Norm ◽  
Injunctive Norm ◽  
Content Type ◽  
Safety Reporting ◽  
Reporting Behaviour

Purpose The purpose of this paper is to analyse the factors that influence food safety reporting intention and behaviour of the public. Design/methodology/approach Data used in this study came from a questionnaire survey conducted in Shandong Province, China. The 642 qualified samples were analysed through structural equation model based on the expanded theory of planned behaviour to study public food safety reporting behaviour and its influencing factors. Findings Results indicated that participation attitude, subjective norm, perceived behavioural control (PBC) and moral norm had significantly positive effects on public reporting intention, which had a direct effect on behaviour. Among subjective norm, descriptive norm had a more significant influence on the intention to report than injunctive norm. PBC indirectly affected reporting behaviour through participation intention, and directly affected participation behaviour. Socio-demographic variables had significant influence on participation attitude, injunctive norm and PBC, whereas these variables had no influence on descriptive norm and moral norm. Originality/value This research is of academic value and of value to policy makers. To promote public participation in food safety reporting, the government should consider influencing factors of food safety reporting.

Method for laying underground pipelines taking into account the danger of landslide processes

2021 ◽  
pp. 16-20
Author(s):  
Хабиб Миргалиб оглы Насиров ◽  
Тофик Инаят оглы Сулейманов ◽  
Рамиз Ахмед оглы Эминов
Keyword(s):  
Calculation Method ◽  
Landslide Hazard ◽  
Low Risk ◽  
Segment Length ◽  
Underground Pipeline ◽  
Landslide Activity ◽  
Underground Pipelines ◽  
Landslide Processes ◽  
Pipeline Design

Известная расчетная методика оценки риска воздействия оползневых процессов на подземный трубопровод позволяет вычислить количество возможных утечек и поломок, исходно приняв данный риск равным для всех равноразмерных отрезков трубопровода. Однако на практике равная степень подверженности оползневой опасности участков трубопровода является исключением. Таким образом, возникает необходимость разработки новой методики расчета, предусматривающей реальные условия проектирования и эксплуатации трубопровода. Авторами определено условие, при котором подверженность трубопровода утечкам и разрывам в результате воздействия оползневых процессов может достигать максимальных значений. Сделан вывод о том, что для обеспечения разумной низкой величины риска следует избегать выполнения полученной зависимости. При этом должны быть соблюдены следующие условия: трасса разделена на неравные отрезки, с увеличением длины отрезка пиковая скорость грунта убывает (то есть более протяженные участки трубопровода следует располагать вдали от зон возможной активности оползневых процессов). The well-known calculation method for assessing the risk of landslide impact on an underground pipeline makes it possible to calculate the number of possible leaks and breakdowns, initially assuming an equal risk for all equally sized pipeline sections. However, in practice, equal exposure to landslide hazard of pipeline sections is an exception. Thus, there is a need to develop a new calculation method that provides for real conditions for pipeline design and operation. The authors determined the condition under which pipeline susceptibility to leaks and ruptures as a result of landslide impact can reach maximum values. It is concluded that in order to ensure a reasonably low risk value, the implementation of the resulting dependence should be avoided. In this case, the following conditions must be met: the route is divided into unequal segments, with an increase in segment length, the peak soil velocity decreases (that is, longer pipeline sections should be located away from possible landslide activity zones).

Seismic Performance of CFRP Jacketed Sub-standard RC Columns Under High Axial Stress and Shear Demand

2021 ◽  
pp. 1278-1290
Author(s):  
Merve Nur Demir ◽  
Ugur Demir ◽  
Cem Demir ◽  
Alper Ilki
Keyword(s):  
Seismic Performance ◽  
Axial Stress ◽  
Rc Columns ◽  
Shear Demand

scholarly journals A Study on a Matching Algorithm for Urban Underground Pipelines

2019 ◽  
Vol 8 (8) ◽  
pp. 352
Author(s):  
Shuai Wang ◽  
Qingsheng Guo ◽  
Xinglin Xu ◽  
Yuwu Xie
Keyword(s):  
Blood Vessels ◽  
Underground Pipeline ◽  
Matching Algorithm ◽  
Partial Matching ◽  
Spatial Objects ◽  
Operation Efficiency ◽  
Geometric Similarity ◽  
Underground Pipelines ◽  
Pipeline Networks ◽  
Matching Performance

Urban underground pipelines are known as “urban blood vessels”. To detect changes in integrated pipelines and professional pipelines, the matching of same-name spatial objects is critical. Existing algorithms used for vector network matching were analyzed to develop an improved matching algorithm that can adapt to underground pipeline networks. Our algorithm improves the holistic matching of pipeline strokes, and also a partial matching algorithm is provided. In this study, appropriate geometric measures were selected to calculate the geometric similarity between pipeline strokes in their holistic matching. Existing methods for evaluating similarities in spatial scene structures in partial underground pipeline networks were improved. A method of partial matching of strokes was additionally investigated, and it compensates for the deficiencies of holistic stroke matching. Experiments showed that the matching performance was good, and the operation efficiency was high.

scholarly journals Analysis of influencing factors for rear-end collision on the freeway

2019 ◽  
Vol 11 (7) ◽  
pp. 168781401986507
Author(s):  
Jianfeng Xi ◽  
Hongyu Guo ◽  
Jian Tian ◽  
Lisa Liu ◽  
Weifu Sun
Keyword(s):  
Influencing Factors ◽  
Significant Influence ◽  
Traffic Accidents ◽  
Influence Factors ◽  
Warning System ◽  
Analysis Model ◽  
Freeway Traffic ◽  
Independent Variables ◽  
Driving Speed ◽  
Fatigue Driving

Rear-end collision accounts for the main type of traffic accidents occurring on the freeway. In order to extract the significant influence factors of rear-end collision on the freeway, this study utilized the data of freeway traffic accidents between 2010 and 2015 in China. First, based on quasi-induced exposure theory, the information of driver, vehicle, and road environment was analyzed. Gender, age, driving age, vehicle safety, load, weather, fatigue, driving speed, road alignment, accident time, and visibility were selected as the important factors that might affect rear-end collision. Second, based on logistic regression model, the influencing factors analysis model of freeway rear-end collision was established. In the regression analysis, the possible important factors selected were taken as the independent variables, and the accident responsibility was taken as the dependent variable. Then, the factors that had significant influence on rear-end collision were selected from candidate independent variables by stepwise regression method. Finally, the specific influence of driving age, load, weather, accident time, visibility, fatigue, and driving speed on rear-end collision occurring on the freeway was discussed. The analysis results were explained according to the odds ratio. The research results of this article can provide guidance for the prevention of rear-end collision on the freeway and theoretical support for the development of freeway early warning system.

Torque Strength and Influencing Factors Analysis for Assembled Camshaft by Knurling Joining

2008 ◽  
Vol 575-578 ◽  
pp. 216-221 ◽  
Author(s):  
Jian Qiao ◽  
Shu Qing Kou ◽  
Dong Ye He ◽  
She Hua Yang
Keyword(s):  
Influencing Factors ◽  
Numerical Results ◽  
Assembly Process ◽  
Functional Aspect ◽  
Press Fit ◽  
Factors Analysis ◽  
The Press ◽  
Joining Strength ◽  
Design And Manufacture

A key functional aspect of assembled camshafts is the joining strength between the shaft tube and the cam lobe, which is depended on the assembly or joining method. The assembly process by knurling joining and torque deformation of assembled camshaft were numerically studied and the key influencing factors on the press fit load and joining strength were analyzed. The experiments including to the press fit and torque strength of lobe/tube joining were carried out.The results show that the torque strength of the cam lobe/shaft joining can availably increase by matching cam and tube materials, choosing appropriate knurling form, enlarging magnitude of interference and extending knurling width. The numerical results agree well with the experiments and are significant in the design and manufacture of assembled camshaft.

Sign in / Sign up

Export Citation Format

Share Document