Observed Performance of Two Adjacent and Concurrently Excavated Deep Foundation Pits in Soft Clay

Zeng, Fan-Yun; Zhang, Zhongjie; Wang, Jianhua; Li, Ming-Guang

doi:10.1061/(asce)cf.1943-5509.0001184

Cited by 45 publications

(17 citation statements)

References 35 publications

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“…Furthermore, Shi et al [10] investigated the excavation of adjacent deep foundation pits and found that large-area excavation around a foundation pit can change the soil pressure of the pile above the excavation surface. Zeng et al [11] studied the deformation of the perimeter walls of two adjacent abutments and found that the deflection profile of each wall in the adjacent pits showed the same pattern as that for walls in a single pit. Nonetheless, to the best of our knowledge, no work has been reported on monitoring and analysis of the excavation of deep foundation pits under simultaneous overloading and unloading conditions.…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior of Deep Foundation Pit under Both Overloading and Unloading Conditions

Wei

Zhou

Yin-Feng

et al. 2020

Mathematical Problems in Engineering

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A deep foundation pit in a station of the Hangzhou subway is adjacent to new high-rise residential buildings on the north side and to the Evergrande foundation pit being excavated on the south side. This work considers the excavation of the foundation pit in the subway station as the research subject, focuses on the difference of the deformation and Earth pressure between the north side and the south side of the foundation pit under these special working conditions through the analysis of the measured data, and compares it with an ordinary foundation pit. Analyzing the measured data reveals that the horizontal displacement of the retaining wall and the ground settlement are far larger on the north side than on the south side, and both often exceed the deformation alarm value; the deformation of the ordinary foundation pit is between the deformation of the overloaded (north) side and that of the unloaded (south) side of the foundation pit. Moreover, the maximum rate of the horizontal creep of the soil and the maximum rate of the creep caused by the ground settlement on the north side of the foundation pit are larger than those on the south side of the foundation pit; the maximum rate of the horizontal creep of the ordinary foundation pit is between the two. The active Earth pressure on the pit wall on the north side is higher than that on the south side of the foundation pit, and because of the surrounding unloading, passive Earth pressure is generated at the bottom of the pit wall on the south side of the foundation pit, which causes it to shift to the outside of the foundation pit. The settlement of the surrounding high-rise buildings and the settlement of the columns are all within the range of the alarm values; also, the buildings settle evenly. Due to the excavation and unloading on the south side of the foundation pit, the uplift of the columns is not considerable.

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Section: Introductionmentioning

confidence: 99%

Deformation Behavior of Deep Foundation Pit under Both Overloading and Unloading Conditions

Wei

Zhou

Yin-Feng

et al. 2020

Mathematical Problems in Engineering

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“…Firstly, the numerical simulation with the on-site monitoring data are compared and analyzed to confirm the validity of finite element calculation (Zeng, Zhang, Wang, & Li, 2018). Figure 7 is the comparative analysis of finite element output and field measured bending moment when the foundation pit is excavated to 21 m. In the figure, the two curves are basically the same in the trend direction, and the bending moment values are basically close.…”

Section: Comparison Between Numerical Simulation and Monitoring Data On-sitementioning

confidence: 99%

Mechanical Performance of Composite Retaining and Protection Structure for Super Large and Deep Foundation Excavations

Cui

Wang

2019

Journal of Civil Engineering and Management

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The reliable retaining methods and a good stress system are the key to the success of super large and deep excavation engineering. In this paper, the deepest foundation pit in Hainan province is taken as an example. The method of mutual verification between in-situ monitoring and numerical simulation is adopted. The mechanical performance of composite retaining structure composed of reinforced concrete cast-in-situ soldier pile wall, diaphragm wall and prestressed anchor cable are studied. The interaction between the reinforced concrete cast-in-situ pile retaining structure at the upper part and the diaphragm wall retaining structure at the lower part is revealed, and the variation of internal forces of the diaphragm wall retaining structure in the time and space is demonstrated. And then the influence of insertion ratio and rigidity on the mechanical properties of diaphragm wall is discussed. Research shows, the range of interaction between the upper and lower retaining structures is limited. During the excavation process, the maximum bending moment of the diaphragm wall is always near the excavation surface, and the curvature of the bending moment curve decreases gradually with the increase of excavation depth and axial tension of anchor. When the insertion ratio of diaphragm wall increases, the maximum bending moment moves upward. With the rigidity of the diaphragm wall increases moderately, the bending moment of the retaining structure increases, but the lateral displacement decreases. The research results can provide theoretical basis and practical experience for the composite retaining structure design of super large and deep foundation excavations.

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“…For the excavation process of foundation pit group, pit A1 was excavated first, and the other pits were excavated simultaneously. In order to implement the refined management of massive construction information and monitoring data, the adjacent foundation pits C1 and D in Shanghai Word Expo Project are taken as the research objects [30]. en, the deformation behaviors were analyzed during the excavation.…”

Section: Project Overviewmentioning

confidence: 99%

Design and Application of a Digital System for Information Management and Synchronous Analysis in a Foundation Pit Group

Zhang

Xiong

et al. 2021

Advances in Civil Engineering

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When several adjacent foundation pits are excavated simultaneously and alternately, the foundation pit group has the interactions which will aggravate the excavation-induced adverse impact on surrounding environment. However, due to the massive construction information and monitoring data during excavation, the effect of interactions on performance of the foundation pits is hardly examined. In this study, a digital system is developed to manage the construction information and monitoring data of the foundation pit group. On the one hand, a visualization management system based on Autodesk Revit is developed to record information such as geometry information, excavation stages, and instrument layout. The complex construction information can be inquired dynamically. On the other hand, a dynamic and synchronous analysis system is developed based on SQL Server external database, Visio, and Excel software. The SQL Server software is capable to facilitate data classification and standardization management. The excavation process and monitoring data are fused through the secondary development of Visio and Excel software to help visualize, respectively. The developed system is applied to the foundation pit group of Shanghai World Expo Project. The lateral deflection of diaphragm walls is investigated and the rebound phenomenon of diaphragm wall is interpreted. It confirms that the developed system can improve the information management so that the deformation behavior of the foundation pit group can be analyzed efficiently.

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Observed Performance of Two Adjacent and Concurrently Excavated Deep Foundation Pits in Soft Clay

Cited by 45 publications

References 35 publications

Deformation Behavior of Deep Foundation Pit under Both Overloading and Unloading Conditions

Deformation Behavior of Deep Foundation Pit under Both Overloading and Unloading Conditions

Mechanical Performance of Composite Retaining and Protection Structure for Super Large and Deep Foundation Excavations

Design and Application of a Digital System for Information Management and Synchronous Analysis in a Foundation Pit Group

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