scholarly journals Dynamic Numerical Analysis of Displacement Restraining Effect of Inclined Earth-Retaining Structure during Embankment Construction

2019 ◽  
Vol 9 (11) ◽  
pp. 2213 ◽  
Author(s):  
Su-Won Son ◽  
Minsu Seo ◽  
Jong-Chul Im ◽  
Jae-Won Yoo
Keyword(s):  
Numerical Analysis ◽  
Maximum Stress ◽  
Lateral Displacement ◽  
Retaining Wall ◽  
Field Tests ◽  
Front Wall ◽  
Construction Process ◽  
Construction Methods ◽  
Excavation Process ◽  
The Stability

Retaining walls are generally used for temporary installations during the excavation process of a construction project. They are also utilized to construct embankments in order to extend a railway facility. In this case, a retaining wall is installed during the construction process and contributes to the resistance of large amounts of stress, including the railway load. However, it is generally difficult to retain walls to maintain their stability. Therefore, alternative construction methods, such as the use of an inclined earth-retaining wall, have been utilized to suppress the lateral displacement. The stability is verified in advance through field tests; however, the maximum stress acting on the railway is thought to be the concentrated railway load. In this study, a two-dimensional numerical analysis was conducted by changing the railway load to a dynamic load. The analysis was applied according to the number of H-piles of the same length (10 m) when only the front wall was installed and when a back support was also applied. It was determined that the lateral displacement of the latter case is smaller than that of the former, whereas the resistance to dynamic loading of the former case is greater.

scholarly journals Research on Construction Methods for Ultralarge Y-Shaped Tunnel Sections

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Shiding Cao ◽  
Yongli Xie ◽  
Wei Tang ◽  
Wei Wang ◽  
Qianru Zhou ◽  
...  
Keyword(s):  
Stability Criterion ◽  
Abrupt Change ◽  
Internal Force ◽  
Special Method ◽  
Large Section ◽  
Large Span ◽  
Construction Methods ◽  
Excavation Process ◽  
Clear Distance ◽  
The Stability

Many problems are encountered in the construction of bifurcated tunnels due the abrupt change in section, small clear distance, and large section. Progress in the direction of tunnel construction is limited by the large-span section; therefore, a special method of construction that involves constructing a guiding tunnel first followed by reverse excavation was adopted to construct the large-span bifurcation section of the Liantang tunnel of Shenzhen Eastern Transit Expressway in China. The stability criterion of the surrounding rock of the middle wall in the section of multiple arch and small clear distance is studied by theoretical analysis, and the internal stress and corresponding ultimate strength of the middle wall under different buried depths and widths of the middle wall are calculated by the stability criterion. In this study, 3D finite-difference software was used to simulate the excavation process under forward and reverse excavation conditions. The results show that the displacement field and internal force field distribution are similar for both excavation methods, and the tunneling first and reverse excavation construction method is safe and reliable.

scholarly journals Study on Deep and Large Foundation Pit of a National First-Class Key Tomb Protection Project

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Jiagang Zhang ◽  
Zhimin Chen ◽  
Mingzhu Hu ◽  
Zhaoguo Wu
Keyword(s):  
Numerical Analysis ◽  
Large Range ◽  
Retaining Wall ◽  
Bending Moment ◽  
Foundation Pit ◽  
Reinforcement Scheme ◽  
Bored Pile ◽  
Maximum Value ◽  
The Stability ◽  
Support Engineering

For the support engineering of the deep and large foundation pit (DLFP) due to tomb protection, there are still no clear standards. The construction of DLFP will introduce large-range transverse and longitudinal disturbance on the stratum; therefore, it should be reinforced. In this paper, the reinforcement of the deep and large foundation pit of a national first-class key tomb protection project is studied. By comparing the existing supporting scheme and the stress conditions of the reinforced tomb, the combination reinforcement scheme by bored pile and pile slab retaining wall is found to be safe and feasible. Furthermore, according to the simulated bending moment, displacement, and axial force of the tomb by numerical analysis, an economic and reasonable mixed anchor support scheme is selected. In order to ensure the stability of the tomb during the supporting process of the foundation pit, a maximum value of 10 mm for the overall settlement of the tomb can be treated as the control benchmark based on the support and anchorage schemes in each specification and the in-site measured settlement values of the tomb. The determined support, anchorage schemes, and the control benchmark can provide certain technique guidance and research significance for the protection of similar ancient buildings in the future.

Study on Lateral Earth Pressure of Anchored Retaining Wall

2013 ◽  
Vol 353-356 ◽  
pp. 312-317
Author(s):  
Ying Yong Li ◽  
Li Zhi Zheng ◽  
Hong Bo Zhang ◽  
Xiu Guang Song ◽  
Zhi Chao Xue
Keyword(s):  
Numerical Simulation ◽  
Pressure Distribution ◽  
Model Test ◽  
Retaining Wall ◽  
Field Tests ◽  
Earth Pressure ◽  
Soil Pressure ◽  
Gravity Retaining Wall ◽  
Lateral Earth Pressure ◽  
The Stability

In order to ensure the security of gravity retaining wall in the high fill subgrade, the design of gravity retaining wall with anchors is proposed,the characteristic of the new wall is that comment anchors are added to the traditional gravity retaining wall,by friction anchors provide lateral pull to the wall so the stability of the new wall is improved. Because of the constraints of anchors, the lateral free deformation is influenced and the soil pressure distribution is very complicated, field tests showed that soil pressure distribution is nonlinear and pressure concentrate in anchoring position. In order to reveal the supporting mechanism of retaining wall and propose the soil pressure formula, the model test of anchor retaining wall is made and numerical simulation is done. The results show that soil pressure appears incresent above the anchor and decreasing below the anchor, the soil pressre also grew larger away from the anchor proximal in the horizontal direction.

Study on the Role of Geogrid-Reinforced for Fly Ash Retaining Wall Basing on the Analysis of FLAC3D

2011 ◽  
Vol 368-373 ◽  
pp. 599-603
Author(s):  
Wei Shi ◽  
Jin Han ◽  
Yong Bin Li
Keyword(s):  
Fly Ash ◽  
Safety Factor ◽  
Lateral Displacement ◽  
Retaining Wall ◽  
Vertical Displacement ◽  
Design Parameters ◽  
Finite Element Software ◽  
The Stability ◽  
The Impact

Geogrid-reinforced retaining wall is widely used in civil engineering, the role of geogrid reinforcement and the calculations of reinforcement material in the retaining wall design need further refinement.This paper analyzes the fly ash retaining wall with and without reinforcement by using finite element software of FLAC3D,studys the impact of geogrid-reinforced function on the stability of fly ash retaining wall ,gets the design parameters of geogrid-reinforced fly ash retaining wall.The numerical results show that: the fly ash retaining walls' safety factor is lower when its height is greater than 6m,reinforcement is needed for fly ash retaining wall to improve its safety factor to ensure the stability of retaining wall.Simulate and analyze the 8m high geogrid reinforced fly ash retaining wall,the results show that: increasing the reinforcement spacing can increase the lateral and vertical displacement of geogrid reinforced fly ash retaining wall, the maximum vertical displacement of retaining wall is in the upper wall,maximum lateral displacement occurs in the lower parts of the retaining wall;the reasonable distance of 8m high fly ash retaining wall is 0.8m.

Numerical Analysis of Back Berm on Road Engineering with FEM

2013 ◽  
Vol 748 ◽  
pp. 1087-1090
Author(s):  
Jie Qun Liu ◽  
Dong Lin Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Lateral Displacement ◽  
Critical Value ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Road Engineering ◽  
The Stability ◽  
Element Method

Based on nonlinear finite element method (FEM), the effect of back berm has been systematically studied. It is found that the lateral displacement of embankment could be reduced by back berm effectively, and the stability of embankment increased rapidly with the width of back berm enlarged. There is a critical value of width of back berm, that the stability of embankment is no more increased with the width of back berm enlarged than critical value.

Influence of Concrete Pouring Sequence on Stability of Different Height High-Formwork Support System

2013 ◽  
Vol 838-841 ◽  
pp. 227-230
Author(s):  
Li Liu ◽  
Fang Wang ◽  
Ju Chao Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Support System ◽  
Lateral Displacement ◽  
Construction Process ◽  
Analysis Software ◽  
Element Analysis ◽  
The Stability

This article used ABAQUS finite element analysis software to established the high-formwork, analyzed effect on stability of the different height formwork by contrasting lateral displacement of various heights, discussed influence of concrete pouring sequence on stability of different height high-formwork support system in the construction process. From the simulated result, it can be seen that with the increase of height, the lateral displacement increased gradually when poured in dissymmetrical way, but the stability of high-formwork decreased, the result also provides evidence for code revision.

The Construction Process Simulation of a Large-Span Rhombic Space Truss Using FEM Analysis

2011 ◽  
Vol 368-373 ◽  
pp. 1101-1104
Author(s):  
Xu Yan ◽  
Tie Ying Li ◽  
Yun Jing Nie
Keyword(s):  
Fem Analysis ◽  
Construction Process ◽  
Large Span ◽  
Construction Design ◽  
Construction Methods ◽  
The North ◽  
Space Truss ◽  
Design Theories ◽  
The Stability ◽  
Space Trusses

With the developments of the design theories and the researches, the quantity and the technology of space truss systems in our country have reached the international leading level. In the meantime, the construction methods need to achieve even higher standard. In the article, the rhombic space truss roof of the north station building of Suzhou is selected as the research object. Each step of the sliding and unloading construction is simulated by FEM. The stability and rigidity of the truss are checked in detail. It gives an representative exsample for complicated construction design of large-span space trusses.

scholarly journals The Study on Construction Technique about The Reinforced Concrete Retaining Wall’s Lateral Displacement Repairing

2018 ◽  
Vol 175 ◽  
pp. 02006
Author(s):  
HAN Shang Yu ◽  
LI Kai Ren ◽  
Qiu Fang
Keyword(s):  
Quality Control ◽  
Reinforced Concrete ◽  
Lateral Displacement ◽  
Retaining Wall ◽  
Wall Structure ◽  
Control Points ◽  
Construction Process ◽  
Lateral Deformation ◽  
Construction Technique

Based on the stress characteristics and the composition of lateral deformation about retaining wall structure, a kind of lateral displacement repairing construction technique of reinforced concrete retaining wall is proposed. Meanwhile, the process principle, construction process and quality control points of the technique are systematically analyzed in this paper. From the application effect of site engineering, the construction proposed in the paper has good engineering benefit and promotion value.

The Numerical Simulation Analysis of Excavation Process of Loess Tunnel

2011 ◽  
Vol 383-390 ◽  
pp. 6594-6600 ◽  
Author(s):  
Jian Guo ◽  
Qi Cai Wang
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Internal Force ◽  
Design Parameters ◽  
Construction Process ◽  
The Finite Element Method ◽  
Excavation Process ◽  
Internal Forces ◽  
The Stability ◽  
Method Construction

The bench method dynamic construction process of Xin Baotashan tunnel which located in the grade IV surrounding rock is simulated by using the finite element method. The variation of displacement and stress field of the surrounding rocks and the internal force of the lining structures during every excavation step is calculated. The state of the surrounding rocks can be predicted by the numerical simulation results, and the construction plan and construction sequences can be guided by the analysis results. At the same time the reasonability and feasibility of the design parameters can be judged by analyzing the internal forces of the lining structures. Analysis and experimental results showed that the stability of the surrounding rocks is good by using the bench method construction to the IV grade surrounding rocks and the design parameters of the lining structures are feasible.

scholarly journals Effect of ballast retaining walls on the lateral resistance of railway tracks

2020 ◽  
pp. 095440972093017
Author(s):  
P Aela ◽  
WL Jia ◽  
GQ Jing
Keyword(s):  
Lateral Displacement ◽  
Retaining Wall ◽  
Retaining Walls ◽  
Railway Tracks ◽  
Lateral Resistance ◽  
The Stability ◽  
Optimum Width

In this study, the application of a retaining wall was proposed as a solution for reducing the lateral displacement of the ballast layer, particularly in sharp curves and bridges. In this regard, a series of single tie push tests were performed on panels with shoulder ballast widths of 300 mm, 400 mm, 500 mm with and without the presence of L-shaped and T-shaped retaining walls. Overall, it was proven that the application of an L-shaped wall led to a 15.8% increase in the lateral resistance, and that T-shaped walls have a higher impact on the stability of the track. A shoulder width of 400 mm was proposed as the optimum width for ballasted tracks with retaining walls.

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