Horizontal Displacement Prediction Research of Deep Foundation Pit Based on the Least Square Support Vector Machine

The reliable prediction of the surface vertical displacement deformation of deep foundation pits is of great significance to the excavation of large foundation pits. The support vector machine model (LIBSVM) has become a hot spot in the prediction of deep foundation pit deformation and provides a new prediction for the deformation of deep foundation pits. In this paper, taking the deep foundation pit of Daoxianghu Road Station in xx as an example, a prediction model of vertical displacement on the ground is established based on LIBSVM and analysis shows that the prediction results based on the model are in good agreement with the measured data, and the MSE reaches 0.0323. The model is effective and has an effective prospective skill.

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Research on Deformation Law of Deep Excavation Supporting Structures in Beijing Metro Station

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.243-249.2338 ◽

2011 ◽

Vol 243-249 ◽

pp. 2338-2344

Author(s):

Qing Yuan Li ◽

Yang Wang

Keyword(s):

Horizontal Displacement ◽

Internal Force ◽

In Situ Monitoring ◽

Deep Excavation ◽

Deep Foundation ◽

Foundation Pit ◽

Metro Station ◽

Deep Foundation Pit ◽

Deformation Law

Taking deep excavation engineering in North Region of Senlin Park Station of Beijing Olympic Subway branch as engineering background, deformation law of enclosure structure of deep excavation are studied by the in-situ monitoring means .It shows that the maximum horizontal displacement of retaining pile is closely related with excavation depth and time. When the deep foundation pit is excavated to a certain depth, and steel brace hasn’t been erected, horizontal displacement of the pile tops is maximum. The location of the maximum horizontal displacement shifts down with foundation pit excavation and steel brace erection. With steel brace application, steel axis force decrease, so steel brace can effectively control horizontal displacements of retaining pile and internal force of steel in the pile. In addition, temperature has a certain effect to axis force of steel brace.

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Study on Composite Soil Nailing Wall in Soft Soil Area of Complex Condition with Emphasis on Analysis by Finite Element Analysis

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.174-177.2020 ◽

2012 ◽

Vol 174-177 ◽

pp. 2020-2023 ◽

Cited By ~ 1

Author(s):

Bing Wang

Keyword(s):

Finite Element ◽

Soft Soil ◽

Horizontal Displacement ◽

Deep Foundation ◽

Circular Area ◽

Foundation Pit ◽

Soil Nails ◽

Deep Foundation Pit ◽

Soft Soil Area ◽

Soil Area

Based on a typical projects, the horizontal displacement in depth, horizontal displacement and vertical subsidence of pile top, and settlements of surrounding buildings are monitored with the process on digging of deep foundation pit. The study on digging process of foundation pit is analyzed by using finite element software. Using mapped meshing method, from mixing the pile near the semi-circular area (radius = 50m), the meshing appropriate encryption in order to improve the accuracy of the external semi-circular area (radius = 65m) mesh is less appropriate sparse.Layer by layer to kill the layers of the soil unit and activate the soil nails (spring element), the simulated excavation and synchronization of soil nails construction.Verify the arc form of failure surface in side of deep foundation pit in soft soil area. Which is valuable for reference to similar structure engineering of foundation pit.

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Deep Foundation Pit Monitoring Based on CX-3C Inclinometer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.484-485.404 ◽

2014 ◽

Vol 484-485 ◽

pp. 404-407 ◽

Cited By ~ 1

Author(s):

Qing Guo Ren ◽

Guang Zhang ◽

Xiao Guang Yue ◽

Wen Cheng Liao

Keyword(s):

Vertical Profile ◽

Retaining Wall ◽

Horizontal Displacement ◽

Displacement Monitoring ◽

Deep Soil ◽

Security Risks ◽

Deep Foundation ◽

Foundation Pit ◽

Deep Foundation Pit ◽

Main Factors

Deep soil horizontal displacement monitoring can measure the retaining wall board, row piles deformed shape, reflect the foundation on the vertical profile of horizontal displacement with depth changes in the law, predict foundation stability and security risks. Combined with Wuhan WANGJiaDun Pit Engineering, this article introduce CX-3C inclinometer work principle, put forward the calculated optimization measures of inclinometer, and analysis the main factors which should be considered to arrange the measuring points.

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Construction Technology of one Unsymmetrical Loaded Deep Foundation Pit Adjacent to Expressway Subgrade

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.919-921.1411 ◽

2014 ◽

Vol 919-921 ◽

pp. 1411-1415

Author(s):

Bo Liu ◽

Pei Sheng Xi

Keyword(s):

Horizontal Displacement ◽

Urban Rail Transit ◽

Construction Technology ◽

Deep Foundation ◽

Foundation Pit ◽

Deep Foundation Pit ◽

Urban Rail ◽

Relative Value ◽

Lower Load ◽

Loaded State

One deep foundation pit in Hefei urban rail transit project is adjacent to the existed expressway subgrade, it's in the unsymmetrical loaded state. The control of foundation pit deformation and the safety of subgrade must be strictly ensured. Based on it, the design scheme of supporting system, the construction processes of earth excavation, top beam, concrete support and steel support was introduced. The horizontal displacement of fender piles and the settlement of subgrade was monitored. The field monitoring results indicate, there exists a great difference between the retaining structure deformation under the action of unsymmetrical load and the deformation under the action of symmetrical load, the horizontal displacement of fender piles on the side of subgrade is bigger than the other side, the upper pile appears to be a "drift" towards the lower-load side; although the absolute value of horizontal displacement of fender piles and settlement of subgrade seems to be a big number, the relative value is small compared to the whole length of fender pile and expressway, meeting relevant standard requirements. The deep foundation pit and expressway kept safe and stable in the all periods of construction, no one accident was occurred during that time. Thus, it can be seen that this construction technology is effective in controlling the deformation during excavation, which can provide a reference for similar projects in design and construction in the future.

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Impact Analysis of Support Structure of Unsymmetrical Loading Deep Foundation Pit Adjoining Highway

The Open Civil Engineering Journal ◽

10.2174/1874149501509010463 ◽

2015 ◽

Vol 9 (1) ◽

pp. 463-470

Author(s):

Donglin Wang ◽

Lei Wang

Keyword(s):

Impact Analysis ◽

Simulation Analysis ◽

Great Influence ◽

Horizontal Displacement ◽

Friction Angle ◽

Deep Foundation ◽

Support Structure ◽

Foundation Pit ◽

Load Effect ◽

Deep Foundation Pit

The air shaft deep foundation pit 6 is influenced by subgrade unbalance loading of highway 312, specifically its deep horizontal displacement of supporting piles and subgrade settlement of expressway 312 under unsymmetrical load effect. This paper carries out construction monitoring and numerical simulation analysis and gives a detailed study on the influenced factors of support structure deformation. Calculation results show that subgrade unsymmetrical load has a great influence on deep horizontal deformation of supporting piles. The maximum horizontal displacement at the bias side is about three times more than non-bias side’s; when the distance of subgrade to foundation pit is the same as the depth of excavation, the influence of subgrade on pit can be ignored; as the cohesion and internal friction angle increases, the horizontal displacement of fender piles decreases. However, enlarging the embedded depth of supporting piles has no significant influence on the stability of foundation pit.

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Displacement Monitoring during the Excavation and Support of Deep Foundation Pit in Complex Environment

Advances in Civil Engineering ◽

10.1155/2021/5715306 ◽

2021 ◽

Vol 2021 ◽

pp. 1-7

Author(s):

Zhouqiang Li

Keyword(s):

Axial Force ◽

Time History ◽

Horizontal Displacement ◽

Underground Water ◽

Surface Settlement ◽

Deep Foundation ◽

Foundation Pit ◽

Deep Foundation Pit ◽

Anchor Cable ◽

The North

Taking a super large deep foundation pit project as an example, the horizontal displacement of crown beam and driveway, surface settlement, axial force of anchor cable, and underground water level in the construction process of the foundation pit are dynamically monitored and analyzed. The excavation deformation rule of the deep foundation pit and the influence of excavation on surrounding buildings are analyzed. The results show that, with the excavation of the foundation pit, the crown beam and driveway of the foundation pit incline towards the direction of the pit and eventually tend to be stable. The variation of axial force of the prestressed anchor cable in the first layer of the foundation pit is basically consistent with the variation of horizontal displacement time history. The variation trend of the groundwater level at each side of the foundation pit is different but tends to be stable in a short time. In the whole monitoring period, the cumulative settlement value of each area of the foundation pit is within the controllable range, but the surface settlement of the north side of the foundation pit and a surrounding building has not reached stability, so it is suggested to extend the monitoring time of settlement in the relevant area.

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Numerical Simulation of Deep Foundation Pit Construction under Complex Site Conditions

Advances in Civil Engineering ◽

10.1155/2021/6669466 ◽

2021 ◽

Vol 2021 ◽

pp. 1-11

Author(s):

Huifen Liu ◽

Kezeng Li ◽

Jianqiang Wang ◽

Chunxiang Cheng

Keyword(s):

Numerical Simulation ◽

Ground Surface ◽

Reference Value ◽

Horizontal Displacement ◽

Deformation Monitoring ◽

Deep Foundation ◽

Foundation Pit ◽

Deep Foundation Pit ◽

Ground Surface Settlement ◽

Stress And Deformation

Based on the deep foundation pit project of Laoguancun station of Wuhan rail transit line 16 and according to the engineering characteristics of the construction conditions and the site surrounding the environment, the method of combining field monitoring and finite element numerical simulation is adopted to analyze the law of stress and deformation of the deep foundation pit during excavation and support construction; it includes the horizontal displacement of the underground diaphragm wall, supporting axial force, and the ground surface settlement, which can be compared with measured data. Finally, some suggestions for monitoring and construction of the deep foundation pit in the subway station have been put forward and have certain reference value and practical guiding significance for the design and construction of similar engineering projects. The deformation monitoring of the retaining structure at the middle of the long side of the foundation pit should be strengthened during the construction process.

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Numerical Simulation of Soil Displacement and Settlement in Deep Foundation Pit Excavations Near Water

Geofluids ◽

10.1155/2021/5559009 ◽

2021 ◽

Vol 2021 ◽

pp. 1-14

Author(s):

Zhongjing Hu ◽

Qingbiao Wang ◽

Shuo Yang ◽

Zhenyue Shi ◽

Bo Liu ◽

...

Keyword(s):

Numerical Simulation ◽

Large Scale ◽

Yellow River ◽

Soft Soil ◽

Ground Surface ◽

Horizontal Displacement ◽

Simulation Method ◽

Deep Foundation ◽

Foundation Pit ◽

Deep Foundation Pit

Advancing urbanization in China requires large-scale high-rise construction and underground transportation projects. Consequently, there is an increasing number of deep foundation pits adjacent to water bodies, and accidents occur frequently. This study uses a numerical simulation method to study the stability of the deep foundation pit near water based on the Biot three-dimensional seepage-stress coupling model, with the open-cut section on the south bank of the Jinan Yellow River Tunnel Project as the engineering field test. This indicates the following: (1) the maximum horizontal displacement of the diaphragm wall occurred in the fifth excavation stage, and a horizontal brace effectively controlled the inward horizontal displacement of the foundation pit; (2) considering the effect of seepage in the soft soil foundation, the maximum vertical displacement of the ground surface at each excavation stage occurred adjacent to the underground continuous wall. As the depth of the foundation pit increased, the vertical surface settlement decreases gradually in the direction away from the excavation face; (3) considering the seepage conditions, within each interval of excavation of the foundation pit, the horizontal displacement of the continuous underground wall and ground settlement declined; and (4) the numerical simulation and field monitoring data were in good agreement. Under the conditions of accurate model simplification and parameter selection, numerical simulations can adequately forecast conditions of the actual project.

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