Deformation Monitoring Analysis and Numerical Simulation in a Deep Foundation Pit

Lin, Peng; Liu, P.; Garg, Ankit; Singh, Y. J.

doi:10.1007/s11204-021-09706-2

Cited by 20 publications

(14 citation statements)

References 2 publications

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“…The foundation pit enclosure project is generally developing in a deeper and larger scale, and the surrounding environment of the foundation pit enclosure is becoming more and more complex. The foundation pit enclosure forms and research methods are in full swing, and the requirements for the foundation pit enclosure structure are getting higher and higher [ 7 ]. The main function of the deep foundation pit supporting structure is to retain soil.…”

Section: Fuzzy Comprehensive Evaluation Methods Based On Fuzzy Logicmentioning

confidence: 99%

Comparison and Economic Envelope Structure Schemes for Deep Foundation Pit of Subway Stations Based on Fuzzy Logic

Liu

Jia

et al. 2022

Computational Intelligence and Neuroscience

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Since the 1990s, with the continuous advancement of urbanization, the proportion of urban population has gradually increased. There is a serious shortage of land resources, and people’s demand for underground space is increasing day by day. The construction of subway stations has developed into an inevitable trend in the future construction engineering industry, and it is also necessary to select the best solution from various solutions. The purpose of this paper is to study how to evaluate and analyze the economy of the deep foundation pit envelope structure of subway stations based on fuzzy logic, so as to choose the optimal and most economical plan. This paper proposes a fuzzy comprehensive evaluation method based on fuzzy logic, which is a reasonable method for the classic evaluation index. The experimental results of this paper show that in 2015 about 8% of people chose to travel by subway. By 2020, 54.5% of people chose to travel by subway, an increase of 46.5% during this period. It can be seen that more and more people are willing to take the subway, and subway transportation is a public transportation mode with large transportation volume. It has obvious public welfare, and it can relieve the urban traffic pressure very well, so the investment in subway construction in various cities is also increasing.

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Section: Fuzzy Comprehensive Evaluation Methods Based On Fuzzy Logicmentioning

confidence: 99%

Comparison and Economic Envelope Structure Schemes for Deep Foundation Pit of Subway Stations Based on Fuzzy Logic

Liu

Jia

et al. 2022

Computational Intelligence and Neuroscience

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“…Te foundation pit support technologies in China mainly include cast-in place pile, prestress anchor, diaphragm wall, inner support, (composite) soil nail wall, and SMW construction method. According to incomplete data statistics, the above traditional support forms [1][2][3][4][5] are chosen by more than 95% of foundation pits. However, with the development of society and the progress of technology, the problems of high cost, large construction space, long construction period, high energy consumption, and serious environment pollution of traditional support forms have become increasingly prominent.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Flexural Behavior of Connected Precast Concrete Square Piles

Dong¹,

Dang

Gao

2023

Advances in Civil Engineering

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Part of deep foundation pit support engineering needs to select connected precast concrete square piles (CPCSPs). Under the premise that the quality of precast concrete square piles (PCSPs) meets engineering requirements, the quality of CPCSPs becomes the key factor to ensure the safety of foundation pit support structures. This paper puts forward a new connection technology of CPCSPs and carries out the flexural behavior experiment of unconnected precast concrete square piles (UPCSPs) and CPCSPs. The distribution of crack and strain on different surfaces of UPCSPs and CPCSPs are measured by carbon fiber composite strain sense optical cables, glass fiber composite strain sense optical cables, and fixed-point polyurethane strain sense optical cables. The anti-crack load, ultimate load, bending moment, and flexural deformation of UPCSPs and CPCSPs are measured. The experimental results of UPCSPs and CPCSPs are compared. The results show that the anti-crack strength of CPCSPs is greatly increased while the flexural deformation of CPCSPs is decreased before the occurrence of crack. With the development of crack (failure stage), the outside areas of hoop steel plate exhibit cracks. At this moment, the strength of CPCSPs is no longer controlled by the strength of middle areas. The ultimate strength of CPCSPs is basically equivalent to that of UPCSPs. The ultimate bending moment of CPCSPs is higher than its design value (about 66%∼76%). The selection of CPCSPs in the design of foundation pit support has good reliability.

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“…The axial force of the servo steel strut was adjusted by installing a hydraulic jack at the free end. During excavation, if the monitored axial force is smaller than the designated value or a new designated value is given, axial force compensation is applied by the hydraulic jack to ensure that the axial force reaches the desired value (Di et al, 2019;Lin et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

A hybrid method to determine optimal design axial forces of servo steel struts in excavations with high deformation requirements

Jin

Zhou

et al. 2023

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PurposeThe application of servo steel struts enables the active control of the excavation-induced deformation in foundation pits. However, there is currently only one design axial force for each servo steel strut, which requires in-situ axial force adjustments based on the experience of site engineers. The purpose of this study is to develop a method for determining the design axial forces of servo steel struts at different excavation steps.Design/methodology/approachIn this study, a hybrid method for determining the design axial forces of servo steel struts in different excavation steps was established based on the combination of the elastic foundation beam model and nonlinear optimisation.FindingsThe hybrid method is capable of providing a better set of design axial forces than the original design method. The lateral wall displacement and bending moment could be better controlled. Ordinary steel struts should be prevented from being set between servo steel struts to avoid axial force losses.Practical implicationsThe axial forces of the servo steel struts at different excavation steps should be designed to achieve better deformation control effects. Moreover, a well-designed set of axial forces can also reduce the internal forces of the retaining structure.Originality/valueThe hybrid method enables the determination of the design axial forces of servo steel struts at different excavation steps, which can guide axial force adjustments in practical projects.

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Deformation Monitoring Analysis and Numerical Simulation in a Deep Foundation Pit

Cited by 20 publications

References 2 publications

Comparison and Economic Envelope Structure Schemes for Deep Foundation Pit of Subway Stations Based on Fuzzy Logic

Comparison and Economic Envelope Structure Schemes for Deep Foundation Pit of Subway Stations Based on Fuzzy Logic

Experimental Study on the Flexural Behavior of Connected Precast Concrete Square Piles

A hybrid method to determine optimal design axial forces of servo steel struts in excavations with high deformation requirements

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