scholarly journals Risk Analysis of Tunnel Construction Scheme Change based on Field Monitoring and Numerical Analysis

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Zhanping Song ◽  
Wanying Su ◽  
Xiaoxu Tian ◽  
Yuwei Zhang ◽  
Guannan Zhou
Keyword(s):  
Numerical Analysis ◽  
Economic Benefits ◽  
Construction Method ◽  
Good Choice ◽  
Successful Implementation ◽  
Finite Element Software ◽  
Construction Scheme ◽  
Surrounding Environment ◽  
The Cross ◽  
Transitional Section

Because of the surrounding environment restriction, some sections of the Lanzhou Metro Line 2 were forced to change the original open excavation method to the concealed excavation method. Among them, the ingate is the transitional section connecting the shaft and the cross passage, which is accompanied by the force conversion of the structure during the plan change process, and accidents are prone to occur. Combining this project situation, a construction scheme for turning the shaft from the cross passage into the ingate of mine line was proposed, and the finite element software is used to simulate the scheme. Numerical analysis shows that the stability of the tunnel supporting structure, shaft, and cross passage all meet the design requirements. The final ground settlement caused by the proposed construction method is 7.1 mm, and the settlement of the vault is 11.97 mm. It also turns out that the proposed construction method causes less deformation, and the method can be applied to the construction of the ingate conversion. The rationality of the method and numerical model was further verified by the comparison between the monitored data of surface settlement and vault sinking and numerical simulation results. Finally, the modified concealed excavation method and the original open excavation construction method is compared. It is concluded that the concealed excavation method is superior to the original open excavation method in terms of construction schedule, construction safety, economic benefits, and impact of construction on the surrounding environment. It indicates that it is a good choice to replace the construction method early if necessary. The successful implementation of this project can provide a reference for the design and implementation of similar urban subway projects.

The Economical and Environmental Advantages of Growing Jatropha Curcas on Marginal Land

2011 ◽  
Vol 361-363 ◽  
pp. 1495-1498 ◽  
Author(s):  
Yen Kuei Tseng
Keyword(s):  
Jatropha Curcas ◽  
Clean Energy ◽  
Economic Benefits ◽  
Good Choice ◽  
Biomass Energy ◽  
Surface Cooling ◽  
Coverage Area ◽  
Surrounding Environment ◽  
Gravel Soil ◽  
Better Than

Biomass energy is a renewable clean energy, which may transfer the perennial biomass into energy, in additions, the plants will absorb the carbon dioxide in the air to reduce the speed of global warming. In this research, the biomass plant -Jatropha curcas will be cultivated on the poor gravel soil and drought land at Taitung in Taiwan, except the economic benefits, the advantages for the surrounding environment also will be discussed. In economical terms, this study comparing the benefits between glowing Jatropha curcas and the aboriginal people’s traditional crops including corn and millet. The results show that glowing Jatropha curcas harvest in its fourth year is same with planting corn but 25% better than planting millet, and will uprise year after year. As for the advantages for the surrounding environment, glowing Jatropha curcas obscured much more sunlight than other plants, the ground surface cooling effect is more obvious, in gravel soil, it can be reduced 60% ,while in drought land is 25%. For function of soil conservation, the depth and the land coverage area of the plant’s root will be measured for estimation. From the results, one can find that planting Jatropha curcas will be better than planting corn or millet, and the performance will enhancing year after year by lasting for 35~50 years, it means that, Jatropha curcas was definitely a good choice for planting on gravel soil or drought land no matter for economical, environmental or land preservative’s sake.

Numerical Simulation of Dynamic Compaction Construction

2014 ◽  
Vol 548-549 ◽  
pp. 1581-1586
Author(s):  
Hong Lin ◽  
Shan Ji ◽  
Bo Li ◽  
Ming Liu
Keyword(s):  
Soil Compaction ◽  
Dynamic Compaction ◽  
Model Parameters ◽  
Finite Element Software ◽  
Dynamic Finite Element ◽  
Construction Scheme ◽  
Surrounding Environment ◽  
The Earth ◽  
University Of Technology ◽  
Life Work

Dynamic compaction is a widely used foundation reinforcement technique. But the energy of the foundation spreading around in the earth by the form of wave will produces bigger effect of vibration on the surrounding environment. It brings a lot of adverse effects to nearby residents life, work, and even to the safety of the surrounding buildings. In actual engineering, we often determine the feasibility of the dynamic compaction construction scheme by the compaction test, which is time-consuming and laborious. Based on the monitoring of stadium area soil compaction in the new campus of Wuhan University of Technology, we use dynamic finite element software named LS-DYNA to simulate the dynamic compaction construction and establish a set to conform to the model parameters of the actual project. We can change the tamping compaction model according to the different adjusting scheme to guide the construction.

Numerical analysis of damage zones in a bridge

2019 ◽  
Vol 11 (1) ◽  
pp. 1-12
Author(s):  
Mohammed Lamine Moussaoui ◽  
Mohamed Chabaat
Keyword(s):  
Numerical Analysis ◽  
Material Properties ◽  
Data File ◽  
Time Range ◽  
Bridge Structure ◽  
Time Step ◽  
Batch Mode ◽  
Content Type ◽  
Finite Element Software ◽  
Von Mises

Purpose The purpose of this paper is to present a numerical analysis of structural monitoring for damage zones detection. The study is performed with Ansys finite element software, which reads in batch mode programming a previously generated mesh data file and computes the transient dynamic solution for each time-step iteration within an analysis time range. Design/methodology/approach The approach itself is applied on a bridge structure which can be potentially subjected to damage zones due to severe loads cases and or earthquakes vibrations. The ideal Von Mises failure criterion ellipsoid envelope is applied for the detection of overstepped computed stresses and strains. Findings This numerical analysis allows computing, for each time-step iteration, the dynamic displacements at each degree of freedom and the corresponding stresses and strains inside the elements under the action of several times dependent loads cases. Practical implications Several simulations are considered to quantify the external loads. Originality/value The material properties of reinforced concrete RC are calculated for an existing specific bridge structure case. The RC strength is then introduced from the basic compounds material properties using the corresponding volumes fractions.

Nonlinear Numerical Analysis of SRC Frame Middle Joints

2013 ◽  
Vol 376 ◽  
pp. 231-235
Author(s):  
Cheng Li ◽  
Yun Zou ◽  
Jie Kong ◽  
Zhi Wei Wan
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Bearing Capacity ◽  
Axial Load ◽  
Load Ratio ◽  
Experimental Results ◽  
Steel Ratio ◽  
Finite Element Software ◽  
Axial Load Ratio ◽  
Hysteretic Performance

Nonlinear numerical analysis for the force performance of frame middle joint is processed in this paper with the finite element software of ABAQUS. Compared with experimental results, numerical analysis results are found to be reasonable. Then the influence of factors such as shaped steel ratio and axial-load ratio are contrastively analyzed. The results show that shaped steel ratio has a greater influence on the bearing capacity and hysteretic performance of the structure, but the axial-load ratio has less influence.

Nonlinear Numerical Analysis of Transfer Column in SRC-RC Hybrid Structure

2014 ◽  
Vol 578-579 ◽  
pp. 936-939 ◽  
Author(s):  
Qian Qian Sun ◽  
Yun Zou ◽  
Qiang Wang
Keyword(s):  
Numerical Analysis ◽  
Axial Load ◽  
Load Ratio ◽  
Hybrid Structure ◽  
Area Ratio ◽  
Experimental Result ◽  
Finite Element Software ◽  
Axial Load Ratio ◽  
Hysteretic Performance ◽  
Extension Length

Nonlinear numerical analysis of the stress performance of SRC-RC transfer columns was carried out in this paper with the finite element software of ABAQUS. Compered with the experimental result , numerical analysis result are found to be reasonable.Then the influence of factors such as extension length of shape steel , area ratio of shape steel and axial-load ratio were contrastively analyzed . The results show that extension length of shape steel and the area ratio of shape steel have a greater influence on the bearing capacity and the hysteretic performance of transfer column ,but axial-load ratio has less influence .

Analysis of Primary Aluminum Composite Panel Gypsum Board Construction Method Paste

2011 ◽  
Vol 255-260 ◽  
pp. 161-165
Author(s):  
Xiang Rong Zhang ◽  
Lu Li
Keyword(s):  
Primary Aluminum ◽  
Economic Benefits ◽  
Construction Method ◽  
Composite Panel ◽  
Aluminum Plate ◽  
Gypsum Board ◽  
Aluminum Composite ◽  
Quality Requirements ◽  
Construction Period ◽  
Silicone Adhesive

Gypsum board as the basis, combined with double-sided adhesive sponge and neutral silicone adhesive connection, this method using gypsum board as the primary fire to A-level, affordable. With high construction speed, short construction period, it can save money and meet the quality requirements and bring greater economic benefits to investors. Therefore, the gypsum board primary aluminum plate construction method paste will be introduced to more and more application.

scholarly journals Numerical Analysis of the Cross-Wedge of a Hollow Rail Axle

2020 ◽  
Vol 14 (1) ◽  
pp. 145-153 ◽  
Author(s):  
Zbigniew Pater ◽  
Konrad Lis ◽  
Patrycja Walczuk-Gągała
Keyword(s):  
Numerical Analysis ◽  
The Cross

How management control systems enable and constrain integrated thinking

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ruth Dimes ◽  
Charl de Villiers
Keyword(s):  
Decision Making ◽  
Control Systems ◽  
Economic Benefits ◽  
Management Control ◽  
Management Control Systems ◽  
Practical Implementation ◽  
Successful Implementation ◽  
Content Type ◽  
Perceived Trust

Purpose This paper aims to examine how management control systems (MCS) can enable and constrain the successful adoption of integrated thinking in an organisation. Design/methodology/approach The study adopts a case study approach, involving in-depth interviews and documentary evidence. Findings The case study organisation perceived trust to be critical to the successful adoption of integrated thinking, and informal social controls with strong endorsement from senior management frequently substituted for more formal technical controls in helping to develop a trust-based organisational culture. These cultural changes improved collaboration and brought economic benefits by encouraging outcome-based decision-making rather than capital-based decision-making, thereby enabling employees to identify and address poorly performing projects earlier. However, established performance measurement systems geared towards reporting and rewarding accounting profits created tension, constraining the potential benefits of integrated thinking by reinforcing business unit protectionism. Practical implications Integrated thinking can be seen as a form of management with the potential to improve organisational outcomes. An improved understanding of factors that might enable or constrain integrated thinking could facilitate its spread. Originality/value Despite several calls for research on the practical implementation of integrated thinking, this has not been studied extensively. To the best of the authors’ knowledge, this study is one of the firsts to contribute to a better understanding of the role of MCS in the successful implementation of integrated thinking in an organisation. The study also contributes to the MCS literature.

scholarly journals Numerical analysis and application of the construction method for the small interval tunnel in the turn line of metro

2020 ◽  
Vol 103 (3) ◽  
pp. 003685042093206 ◽  
Author(s):  
Zhanping Song ◽  
Xiaoxu Tian ◽  
Qi Liu ◽  
Yuwei Zhang ◽  
Heng Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Construction Method ◽  
Surface Settlement ◽  
Underground Excavation ◽  
Small Interval ◽  
Resource Configuration ◽  
Construction Methods ◽  
Initial Support ◽  
Left And Right

The surrounding rock may become unstable or even fall down and the initial support may crack and be destroyed when the construction method of the underground excavation tunnel is not properly selected in the turn line of metro. . A section of the Santunbei turn line of Urumqi Metro Line 1# was taken as the engineering background. The proposed construction method was analyzed by numerical simulation. Numerical analysis shows that the final surface settlement caused by the proposed construction method is 3.0 mm and the horizontal convergence is 3.2 mm. It also turns out that the proposed construction method causes less deformation, and the method can be applied to the construction of the small interval tunnel in the Santunbei turn line of metro. The rationality of the method and numerical model was further verified by comparison between the monitored data of surface settlement, horizontal convergence and vault sinking, and numerical simulation results. Finally, the deformation and stress of the six construction methods were compared. The deformation and stress caused by the six construction methods are almost the same. It indicates that the construction spacing between the left and right tunnels does not affect the safety of tunnel construction. Therefore, the appropriate construction spacing could be selected according to the resource configuration, instead of deformation and stress.

The Performance of Bolted Slant Endplate Connections Subjected to Temperature Increase

2010 ◽  
Author(s):  
F. Zahmatkesh ◽  
E. Talebi
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Elastic Field ◽  
Frame Structures ◽  
Moment Frame ◽  
Steel Moment Frame ◽  
Finite Element Software ◽  
Endplate Connections ◽  
Endplate Connection ◽  
Simple Modeling

In this paper the main goal is to evaluate the vertical and slant bolted endplate connections performance in steel moment frame structures under thermal effect in elastic field, and by a finite element software. the connections are simulated to complete and verify simple modeling of analytical and numerical analysis of the behavior of vertical and slant bolted endplate connections due to increase in temperature. The results that are obtained from performance of a vertical bolted endplate connection and a slant bolted endplate connection due to increase in temperature will be compared.

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