scholarly journals Study on Supporting Structure Performance of Deep Soft Soil Foundation Pit near Sea under Waves, Tides, Vibration, and Unbalanced Loads

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Junsheng Chen ◽  
Chen Lin ◽  
Shuzhuo Liu ◽  
Haihong Mo
Keyword(s):  
Mechanical Performance ◽  
Soft Soil ◽  
Offshore Structure ◽  
Foundation Pit ◽  
Supporting Structure ◽  
Vibration Loads ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Unbalanced Loads ◽  
Offshore Foundation

In addition to the vibration loads caused by offshore structure construction, the offshore foundation pit can also be affected by additional hydraulic loads such as waves, tides, and typhoons, hindering our understanding of the mechanical performance of the foundation pit supporting structure. In order to illuminate this mechanical performance under waves, tides, hammering, and unbalanced loads, this paper analyzed the supporting structure with theoretical and numerical simulations. The results were verified with field monitoring data. Moreover, the influences of loads, including construction vibration loads and unbalanced loads, on structure and soil were discussed. By applying these results to the engineering design, this research could provide a reference for studying mechanical properties of relevant supporting structures and the construction of offshore foundation pits.

A Comprehensive Analysis of Soft Soil Foundation Pit Accident

2013 ◽  
Vol 405-408 ◽  
pp. 3-9 ◽  
Author(s):  
Hui Hu ◽  
Lian Sheng Tang ◽  
Xing Li Lin ◽  
Fei Kuang
Keyword(s):  
Soft Soil ◽  
Comprehensive Analysis ◽  
Accident Investigation ◽  
Foundation Pit ◽  
Factors Affecting ◽  
Pullout Resistance ◽  
Supporting Structure ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Design Factors

Factors affecting the supporting structure in a soft soil foundation pit are analyzed in this paper. Based on the information obtained from accident investigation, design factors and construction factors, such as insufficient embedded depth of pile and insufficient anchor pullout resistance, are discussed in detail. The analysis and conclusions can serve as a good reference for similar projects design and construction.

The Application of Anchor Block in Large Soft Foundation Pit Excavation

2012 ◽  
Vol 170-173 ◽  
pp. 520-524
Author(s):  
Chi Ma ◽  
Guo Nan Liu ◽  
Yue Ying Liang
Keyword(s):  
Soft Soil ◽  
Rail Transport ◽  
Foundation Engineering ◽  
Foundation Pit ◽  
Soft Foundation ◽  
New Ideas ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Improved Design ◽  
Anchor Block

Based on pit excavation of Shenzhen Airport Rail transport hub project, combined with anchorage stress characteristics, difficulties was studied and numerical calculation for the envelope structure was undertaken. The successful application of design provides new ideas, improved design methods for super soft soil foundation engineering, which can greatly promote the application and development of anchor block in soft foundation excavation.

Analysis on Excavation Procedure in Large Soft Soil Foundation Pit of Shanghai Expo Axis

2011 ◽  
Vol 243-249 ◽  
pp. 2909-2914
Author(s):  
Xiang Yuan ◽  
Quan Mei Gong ◽  
Shun Hua Zhou
Keyword(s):  
Numerical Calculation ◽  
Soft Soil ◽  
Model Tests ◽  
Diaphragm Wall ◽  
Foundation Pit ◽  
Centrifuge Model ◽  
Wall Deformation ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Centrifuge Model Tests

On the basis of the large soft soil foundation pit of Shanghai Expo axis and the Section 1 of underground complex project, this paper proposes the appropriate excavation procedure according to the results obtained by using centrifuge model tests and time hardening creep model, which uses ANSYS to compute foundation pit deformation caused by different excavation timeline, sequence and longitudinal excavation width of remained berm. The results of numerical calculation were approximately close to the horizontal displacement of the underground diaphragm wall measured both on site and from centrifuge model tests, so numerical calculation could well reflect the deformation behavior of excavation. The study also showed that more than 80% of underground diaphragm wall deformation caused by soil creep occurred within 60 days after the remained berm being excavated. In order to decrease the deformation, it would be useful to conduct plate structures as soon as the remained berm started being excavated. Remained berm and middle plate had good control over underground diaphragm wall deformation. When the remained berm was excavated by jumpily digging method, it would be advisable to firstly excavate the vicinity of underground diaphragm wall where there were no required protected objects nearby. The longitudinal excavation width of remained berm was proposed to be 20 meters in the north part and 30 meters in the south part.

Selection Analysis of Enclosure Structure for Deep Foundation Pit under Complicated Geological Conditions

2012 ◽  
Vol 446-449 ◽  
pp. 1400-1403
Author(s):  
Qi Hu ◽  
Sheng Ming Luo ◽  
Zhu Jin Jiang
Keyword(s):  
Soft Soil ◽  
Structure Design ◽  
Soil Conditions ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Structure Selection ◽  
Geological Conditions ◽  
Soil Foundation ◽  
Soft Soil Foundation

By comprehensive consideration of soil conditions, geometric shape of deep foundation pit and many other kinds of factors, enclosure structure design needs to select optimal supporting and enclosure system with safety, economy and construction feasibility. On case study of enclosure structure selection about typical soft soil foundation, this paper researches effects of force- deformation of enclosure structure by brace layout, and of economy and construction feasibility. The research results may offer reference for similar projects.

Numerical Simulation of Construction of Super-Large Deep Soft Soil Foundation Pits and Analysis of its Spatial and Temporal Effects

2015 ◽  
Vol 724 ◽  
pp. 79-83
Author(s):  
Xiao Qin Wang ◽  
Ting Ting Sun
Keyword(s):  
Constitutive Relations ◽  
Soft Soil ◽  
Earth Pressure ◽  
Deep Foundation ◽  
Support Structure ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Deep Soft Soil

The constitutive relations of soil in the super-large deep foundation pit project and the law of interaction between soil and the support structure were studied. The excavation of the foundation pit was simulated. The coupling of soil and the support structure and the change in earth pressure with the progress of excavation were analyzed, and the scope of influence of foundationsubsidence was obtained.

scholarly journals The Influences of Bladder Properties on the Working Performance of the Multibladder-Type Inflatable Anchor

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Wen Xiang Peng ◽  
Ming Kai Xu ◽  
Yi Fan Chen ◽  
Bo Yuan ◽  
Zhuo Yang ◽  
...  
Keyword(s):  
Optimization Design ◽  
Field Experiments ◽  
Soft Soil ◽  
Control Variable ◽  
Engineering Practice ◽  
Foundation Pit ◽  
Engineering Construction ◽  
Deformation Control ◽  
Soil Foundation ◽  
Soft Soil Foundation

Due to the high bearing capacity and better controllability of bladder parameters, the multibladder-type inflatable anchor shows a great application prospect in the engineering construction in soft soil areas. In this study, based on a soft soil foundation pit project in Guangzhou Province, China, the multibladder-type inflatable anchor was applied to the engineering practice for the first time, and the working characteristics of the multibladder-type inflatable anchor were analyzed and discussed through field experiments. Primarily, the optimization design and experimental facility of the multibladder-type inflatable anchor were introduced in detail to realize the refinement and perfection of the anchorage technological process. Besides, the influence degrees of the bladder number, diameter, thickness, space, and length on the bearing characteristics and deformation control of the anchor were studied by using the control variable method, as well as the influencing mechanisms. Subsequently, the advantages of the multibladder-type inflatable anchor were presented by comparing its anchoring efficacy with that of the traditional grouting anchor. Ultimately, the analysis results were used to verify the reliability of the multibladder-type inflatable anchor and provide the experimental basis for its popularization and application.

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