scholarly journals Discussion on Monitoring Method for Horizontal Displacement of Supporting Pile Top of Deep Foundation Pit in Urban Rail Transit Project

2020 ◽  
Vol 474 ◽  
pp. 072021
Author(s):  
Yiteng Xu ◽  
Fanglong Yuan ◽  
Dayong Wang ◽  
Zhifa Yu ◽  
Lixin Li
Keyword(s):  
Horizontal Displacement ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Monitoring Method ◽  
Deep Foundation Pit ◽  
Urban Rail

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

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.

Horizontal displacement monitoring method of deep foundation pit based on laser image recognition technology

2018 ◽  
Vol 89 (12) ◽  
pp. 125006 ◽  
Author(s):  
Peng Liu ◽  
Shulin Xie ◽  
Guangyi Zhou ◽  
Lixiao Zhang ◽  
Guoxian Zhang ◽  
...  
Keyword(s):  
Image Recognition ◽  
Horizontal Displacement ◽  
Displacement Monitoring ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Monitoring Method ◽  
Deep Foundation Pit

The Applied Research of Safety Monitoring and Forecasting Technology in the Foundation Pit Supporting Construction

2013 ◽  
Vol 443 ◽  
pp. 214-217
Author(s):  
Zhen Xi Yu
Keyword(s):  
Applied Research ◽  
Technical Process ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Monitoring Method ◽  
Engineering Construction ◽  
Deep Foundation Pit ◽  
High Rise ◽  
Monitoring And Forecasting ◽  
Control Accuracy

With the scale development of our high-rise buildings, together with the development and enhancing of monitoring technology of deep foundation pit supporting construction. Control accuracy is the main part for monitoring technical process in deep foundation pit supporting construction, the requirement of monitoring is higher and higher than before, relevant monitoring method, frock and tools, earthwork type of shipping and downriver way in engineering construction will develop in revolutionary way. In view of above mentioned, this paper try to do researching on monitoring technical process in deep foundation pit supporting construction in our country, hope to supply reference for counterparts.

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

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.

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

2012 ◽  
Vol 174-177 ◽  
pp. 2020-2023 ◽  
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.

Deep Foundation Pit Monitoring Based on CX-3C Inclinometer

2014 ◽  
Vol 484-485 ◽  
pp. 404-407 ◽  
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.

Research on Application of Deep Foundation Pit Decompression Dewatering Technology and Impact on Surrounding Environment

2013 ◽  
Vol 671-674 ◽  
pp. 101-104
Author(s):  
Dong Dong Zhang ◽  
Jun Wen Ding ◽  
Rong Biao Wang
Keyword(s):  
Engineering Application ◽  
Pumping Test ◽  
Rail Transit ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Hydrogeological Parameters ◽  
Surrounding Environment ◽  
Practical Engineering ◽  
Research On Application

The studies application of deep foundation pit decompression technology focusing on special engineering geological and hydrogeological conditions. Taking foundation pit dewatering of certain rail transit station as an example, designs deep foundation pit decompression precipitation technology scheme with hydrogeological parameters obtained through pumping test, and assesses and monitors its impacts on surrounding environment according to measured data on project site, which has achieved good results in practical engineering application and provides foundation for construction of rail transit lines.

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

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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