Experimental Study on the Influence of Foundation Pit Dewatering on Shear Strength and Deformation of Pit Bottom Soil in Soft Soil Area

2014 ◽  
Author(s):  
Chunlin Ding ◽  
Ying Xu ◽  
Xuping Wu ◽  
Keliang Wu
Keyword(s):  
Experimental Study ◽  
Shear Strength ◽  
Soft Soil ◽  
Foundation Pit ◽  
Bottom Soil ◽  
Strength And Deformation ◽  
Soft Soil Area ◽  
Soil Area

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.

Analysis of the influence of soft soil grouting on the metro tunnel based on field measurement

2019 ◽  
Vol 36 (5) ◽  
pp. 1522-1541
Author(s):  
Zhi Ding ◽  
Xiao Zhang ◽  
Xinsheng Yin ◽  
Jiqing Jiang
Keyword(s):  
Soft Soil ◽  
Vertical Direction ◽  
Measured Data ◽  
Shield Tunnel ◽  
Foundation Pit ◽  
Overburden Pressure ◽  
Content Type ◽  
Metro Tunnel ◽  
Soft Soil Area ◽  
Soil Area

Purpose This paper aims to analyse the effect of soft soil grouting on the deformation of the closed shield tunnel with the measured data. Design/methodology/approach Combining the measured data of vertical, horizontal and convergence deformation of the adjacent tunnel during the grouting construction in foundation pit engineering, the influence of grouting on metro tunnel in soft soil area is analyzed. Findings The researches indicate that early grouting has the main effect on the horizontal displacement of the tunnel; Due to the disturbing effect of the uninterrupted grouting construction on the soil and the transfer pressure of the rheological soil to the bottom of the tunnel, the tunnel is obviously lifted; And the convergence deformation of the tunnel increases caused by the overburden pressure in the vertical direction, so that the tunnel appears the phenomenon of staggered seam, large opening of bolted joint, damaged segment even leakage of water. Originality/value The study based on the field monitoring data is rarely reported, especially the topic about inadvertent grouting in soft soil area is likely to cause severe deformation of adjacent metro tunnel.

Study on Failure Mode of Underground Diaphragm Wall in Soft Soil Area

2013 ◽  
Vol 405-408 ◽  
pp. 1375-1382
Author(s):  
Shi Min Zhang ◽  
Xiang Li ◽  
Deng Hui Li ◽  
Zhi Ding ◽  
Gang Wei
Keyword(s):  
Failure Mode ◽  
Optimization Design ◽  
Failure Modes ◽  
Soft Soil ◽  
Diaphragm Wall ◽  
Wall Structure ◽  
Prevention Measures ◽  
Foundation Pit ◽  
Soft Soil Area ◽  
Soil Area

Zhejiang Province is Located in the Yangtze River Delta which the Soft Soil has Large Thickness and the High Underground Water Level.There is a Higher Requirement for the Optimization Design and Safety Construction of Deep Foundation.According to the Summary and Analysis of some Common Cause Failure of the Foundation Pit Engineering，we can Conclude that there are some Failure Mode in Soft Soil Area of Underground Diaphragm Wall Structure such as Foundation Pit System Instability，Basal Failure，Piping and the Flow of Sand Damage，Support Structure Instability and the Support of Low Strength or Buckling，and Summarizes some Prevention Measures on the Destruction of Underground Diaphragm Wall in the Light of these Failure Modes.

Finite Element Study on Ring-Beam Supporting Structure of Deep Foundation Pit in Coastal Soft Soil Area

2012 ◽  
Vol 256-259 ◽  
pp. 1908-1911 ◽  
Author(s):  
Xi Yuan Liu ◽  
Wen Peng Cai ◽  
Ji Zhou ◽  
Xin Yan Wang
Keyword(s):  
Finite Element ◽  
Soft Soil ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
Soil Settlement ◽  
Soft Soil Area ◽  
Stress And Deformation ◽  
Soil Area

Ring-beam supporting technology is increasingly used in coastal soft soil area. Based on a foundation pit supporting case of general hospital in Tianjin, the 3-dim finite element construction was simulated with MIDAS/GTS. According to the calculation, the stress and deformation characteristics of deep foundation pit supporting structure under the ring-beam action in soft soil area, and the surrounding soil settlement is analyzed. The final foundation pit supporting solution is selected between two different schemes. The analysis method and conclusions are useful for design and construction of other similar projects.

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