A numerical study on the influence of anchorage failure for a deep excavation retained by anchored pile walls

Zhao, Wen; Han, Jiqing; Yang, Chen; Jia, Pengjiao; Li, Shengang; Li, Yi; Zhi-qiang, Zhao

doi:10.1177/1687814018756775

Cited by 32 publications

(10 citation statements)

References 22 publications

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“…PLAXIS finite element software is a large finite element program developed by Delft University Research Center in the Netherlands, which is specially used to analyze the deformation and stability of geotechnical engineering (Zhao & You, 2018;Zhao, Han, & Chen, 2018;Bryson & Zapata-Medina, 2012). In this paper, PLAXIS finite element soft-ware is used to simulate the excavation process of super large and deep foundation excavations, revealing the mechanical properties of composite retaining and protection structures, and comparing the simulation results with the field measurement, as a test for the original excavation engineering design.…”

Section: Monitoring Principlementioning

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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Section: Monitoring Principlementioning

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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“…But for the numerical simulation software, c = 0 may cause some options performing hardly, even calculation non-convergence. Therefore, the cohesions of sandy soils are generally assumed to be 1 kPa in the numerical analysis [37][38][39]. STS structure elements, primary lining, beam and columns are deemed to have a liner-elastic behavior.…”

Section: Model and Materials Propertiesmentioning

confidence: 99%

A Case Study on the Application of the Steel Tube Slab Structure in Construction of a Subway Station

et al. 2018

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It is an effective approach to use Steel Tube Slab (STS) structure combined with the Pile-Beam-Arch (PBA) method to construct a large-space underground station. Traditional construction methods cannot meet the requirement of construction because of the complicated soil layers and high building densities in urban areas. The STS method can effectively increase the rigidity of the supporting system by using steel tubes. Firstly, the stress of bolts and steel tubes are investigated in the construction process based on the field monitoring data. Subsequently, FLAC3D is used to establish a three-dimensional model, which is verified based on the in-situ monitoring data; the effect of excavation process on ground settlement, deformation of STS structure and bridge pile are studied by numerical results. Moreover, the key parameters such as welding of flanges and the step length are studied. The results show that the stress of the steel tubes and flanges does not exceed the designed strength during the construction process. Based on the numerical simulation data, it is indicated that the STS structure can be a very effective and dependable measure in controlling and reducing the surface settlement and the existing adjacent buildings. The numerical results can be used to guide the later construction.

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“…Suo et al (2016) and Wang et al (2021) used BOTDA distributed optical fiber sensing technology to test the stress of a pile-anchor supporting system in the process of deep foundation pit excavation and studied the deformation law and internal force distribution characteristics of pile-anchor supporting structures. Furthermore, many scholars (Prat, 2017;Shu and Zhang, 2017;Zhao et al, 2018;Zhang et al, 2020) have used finite software-an indispensable research tool in geotechnical engineering-to explore pile-anchor supporting structures in slope engineering. They mainly studies the deformation and internal force of the supporting structure in the pile-anchor structure supporting slope engineering, the stability of the slope, the types and causes of anchoring failure, the influence of cutting some piles on the load transfer trend of the supporting structure, etc.…”

Section: Introductionmentioning

confidence: 99%

Simplified calculation method and stability analysis of top beam cooperative pile–anchor supporting slope structure

Zhu

2022

Front. Mater.

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Aiming at the problem of insufficient research on the action mechanism and stability calculation method of the top beam in the pile-anchor support structure, firstly the force and deformation model are established based on the elastic fulcrum method and the deformation coordination principle of the pile-anchor structure at the pile top and the anchor end in this paper. Secondly, the calculation model of the support structure under the synergy of the crown and beam and the simplified calculation method of the internal force, displacement and overall stability of the slope are constructed. Finally, combined with an engineering example, a MATLAB program was compiled for calculation, and the pile-anchor structures with crowned beams and without crowned beams were simulated and calculated by the finite element software PLAXIS 3D and Geo Studio. These three aspects are compared and verified. The results show that the internal force, deformation and minimum safety factor calculated by the method in this paper are basically consistent with the numerical simulation calculation results of the top beam condition; the existence of the top beam effectively enhances the bearing capacity of the pile body, and also restricts the displacement of the pile top development; the synergy of the crown and beam makes the safety factor of the slope increase significantly and improves the safety and stability of the slope. The research in this paper can provide a certain reference value for the theoretical calculation and design of the pile-anchor supported slope considering the top beam in engineering practice.

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A numerical study on the influence of anchorage failure for a deep excavation retained by anchored pile walls

Cited by 32 publications

References 22 publications

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

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

A Case Study on the Application of the Steel Tube Slab Structure in Construction of a Subway Station

Simplified calculation method and stability analysis of top beam cooperative pile–anchor supporting slope structure

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