ЕЛ

Елизавета Лосева

Saint Petersburg Mining University

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Co-Authors

I. N. Lozovsky

Schmidt Institute of Physics of the Earth

A.I. Osokin

Saint Petersburg State University of Architecture and Civil Engineering

R. A. Zhostkov

Schmidt Institute of Physics of the Earth

VА

V. А. Syaskо

HTWG Hochschule Konstanz - Technik, Wirtschaft und Gestaltung

Daniil Mironov

Saint Petersburg State University of Architecture and Civil Engineering

АА

А. А. Чуркин

Gersevanov Research Institute of Bases and Underground Structures

ЕХ

Е.Н. Харченко

Natalia Koteleva

Saint Petersburg Mining University

I. P. D’yakonov

Saint Petersburg State University of Architecture and Civil Engineering

Alexander Lavrik

Saint Petersburg Mining University

Cooperative Institutions

Saint Petersburg Mining University

Schmidt Institute of Physics of the Earth

Saint Petersburg State University of Architecture and Civil Engineering

Russian Academy of Sciences

Lomonosov Moscow State University

Gersevanov Research Institute of Bases and Underground Structures

Mining Institute

ITMO University

Medical University of Varna

Melnikov Permafrost Institute of the Siberian Branch of the Russian Academy of Science

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Ensuring the Sustainability of Arctic Industrial Facilities under Conditions of Global Climate Change

Resources (2021)

George V. Buslaev Pavel Tsvetkov Alexander Lavrik Andrey Kunshin Елизавета Лосева

Global climate change poses a challenge to the mineral development industry in the Arctic regions. Civil and industrial buildings designed and constructed without consideration of warming factors are beginning to collapse due to changes in the permafrost structure. St. Petersburg Mining University is developing technical and technological solutions for the construction of remote Arctic facilities and a methodology for their design based on physical and mathematical predictive modeling. The article presents the results of modeling the thermal regimes of permafrost soils in conditions of thermal influence of piles and proposes measures that allow a timely response to the loss of bearing capacity of piles. Designing pile foundations following the methodology proposed in the article to reduce the risks from global climate change will ensure the stability of remote Arctic facilities located in the zone of permafrost spreading.

10.3390/resources10120128

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Citations (28)

Wavelet Analysis for Evaluating the Length of Precast Spliced Piles Using Low Strain Integrity Testing

Applied Sciences (2022)

Елизавета Лосева I. N. Lozovsky R. A. Zhostkov V. А. Syaskо

The difficulties with the application of low strain integrity testing for evaluating the length of driven precast piles of two sections justify the need for new data acquisition and analysis techniques. The standard time domain analysis of the recorded signals may not allow for distinguishing the desired responses from a pile toe and a splice. In this paper, we propose the use of a set of hammers of different weights and tip materials that will provide various sensitivities of the test to a pile splice. To further analyze the collected data, we study the distributions of phase angles obtained using complex continuous wavelet transform. The characteristic phase shifts that distribute from higher to lower frequencies can be interpreted as responses from a pile toe and a splice. To verify the proposed approaches, a series of numerical simulations were performed using the finite element method for the driven pile models with the different properties of a splice zone. Numerical simulation results show that the pile splices are clearly identified when using the shorter input pulses which can be generated by light hammers with a hard head material. The total length of a simulated pile with a 1 mm air gap between sections was undetectable by standard data analysis approaches and was evaluated when analyzing the wavelet phase angle distributions. Numerically validated data acquisition and analysis techniques were applied to field data analysis and allowed us to confidently identify the length of two-section piles grouped with a pile cap.

Hammer

Precast concrete

splice

10.3390/app122110901

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Citations (14)

Specific features of diaphragm wall construction

IOP Conference Series Materials Science and Engineering (2020)

Daniil Mironov A.I. Osokin Елизавета Лосева A.I. Kuzhelev

Abstract The paper observes various technologies of diaphragm wall implementation as a shoring system in excavation pits. Protection of the adjacent existing buildings and structures and maximal removal of the impact to the existing city building system during construction process are considered as the key positive factor of the diaphragm wall technology. The consideration is made basing on the completed projects within dense existing building system of Saint-Petersburg where each free land plot is valuable and shall be used with the maximum benefit.

Shoring

Diaphragm (acoustics)

10.1088/1757-899x/775/1/012051

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Citations (5)

WAVELET DENOISING FOR LOW STRAIN PILE INTEGRITY TESTING

Kontrol Diagnostika (2022)

I. N. Lozovsky Елизавета Лосева V. А. Syaskо

Low strain impact test is widely used to assess the structural integrity of reinforced concrete piles due to its high productivity and cost effectiveness. However, a low signal-to-noise ratio may prevent proper evaluation of pile length and integrity using the standard data analysis approaches. In this paper, we propose a technique for the time-frequency analysis of low strain test data, which allows us to separate the useful components of a signal from the unwanted ones. The technique is based on the continuous wavelet transform with the complex Morlet wavelet, which is shown to be the most suitable for the low strain test data decomposition. To filter the signal, the moving median of the square modulus of the continuous wavelet transform is calculated in the frequency band of the initial impact pulse. The capabilities of the technique are illustrated by the low strain test signals with the artificial noise and the results of a field test of a 30m long bored pile.

Morlet wavelet

SIGNAL (programming language)

10.14489/td.2022.09.pp.036-045

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Citations (3)

INCREASING THE RELIABILITY OF THE LOW STRAIN INTEGRITY TESTING OF PILES UNDER EXISTING STRUCTURES

Kontrol Diagnostika (2022)

А. А. Чуркин Елизавета Лосева I. N. Lozovsky V. А. Syaskо

Inspection of piles located under the pile cap or an existing building is a common task in the practice of capital construction. The low strain impact testing allows us to estimate the pile length and the presence of defects in its body. This provides designers and builders with information on structures, which can be considered when planning the further operation of the foundation. Improving the reliability of test results for examining piles under cap is the issue of interest. On the example of field test results, the application of the multifrequency signal excitation during data collection and the wavelet analysis of signals during data processing are shown.

Foundation (evidence)

10.14489/td.2022.10.pp.024-032

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Citations (2)

Identifying Small Defects in Cast-in-Place Piles Using Low Strain Integrity Testing

Indian geotechnical journal (2022)

Елизавета Лосева I. N. Lozovsky R. A. Zhostkov

Hammer

Structural integrity

10.1007/s40098-021-00583-y

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Citations (10)

SPECIFIC FEATURES OF THE CONSTRUCTION AND QUALITY CONTROL OF PILE FOUNDATIONS IN ENGINEERING AND GEOLOGICAL CONDITIONS OF SAINT PETERSBURG

Architecture and Engineering (2020)

Елизавета Лосева A.I. Osokin Daniil Mironov I. P. D’yakonov

Introduction: The article reviews various methods of the construction and quality control of pile foundations in complex geological conditions of Saint Petersburg. The authors describe conditions, under which the geological structure of the city was formed. They list the main factors affecting the selection of foundation types and methods of their construction, describe soil properties influencing the quality of piles. Methods: Methods of pile construction based on different drilling technologies are presented (bored piles, pre-fabricated piles, displacement piles (with soil compaction and extraction)). Various methods of the quality control of piles constructed are also described (seismoacoustic, ultrasonic). Conclusions: Based on the results of the study, it is concluded that pile quality control methods shall be widely used and their applicability shall be extended. Discussion: It is suggested to improve methods of pile foundation integrity testing, increase their use on construction sites, study their applicability not only to detect defects in a pile but to control the quality of construction and materials used.

Saint petersburg

Foundation (evidence)

10.23968/2500-0055-2020-5-2-38-45

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Citations (9)

Development of an Algorithm for Determining Defects in Cast-in-Place Piles Based on the Data Analysis of Low Strain Integrity Testing

Applied Sciences (2022)

Natalia Koteleva Елизавета Лосева

Low strain integrity testing for pile quality control, based on the analysis of elastic waves, is one of the most common methods, due to its high efficiency. However, it also has a number of limitations that should be taken into account during pile testing. For additional study of the method and its effectiveness, an experimental site was constructed, consisting of ten cast-in-place piles with embedded defects. When analyzing field data, pile defects were not identified. For further analysis of the problem, as well as for interpreting the results and identifying pile defects, a cluster analysis method, the so-called ANN-classifier, is proposed. This paper describes the results of creating an algorithm for the recognition of defects and their localization in cast-in-place piles. It is proposed that use of the characteristic points of the spectrum of the signal as the input vector of the ANN classifier, and the type of pile defect as the output vector, is optimal. The results of the study led to the conclusion that the ANN-classifier can be used as the main tool for automatic interpretation of the results obtained by low strain integrity testing.

10.3390/app122010636

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Citations (11)

ОСОБЛИВОСТІ ФОРМУВАННЯ КОМФОРТНОГО АРХІТЕКТУРНОГО ЖИТЛОВОГО ПРОСТОРУ

European Science (2023)

Е.Н. Харченко Елизавета Лосева

Relevance: the problem of information space, discomfort in a permanent place of residence, and global environmental and social problems cause strong stress in a person. To solve and improve the situation, it is necessary to investigate the situation in th

Relevance

10.30890/2709-2313.2023-20-02-007

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Citations (0)

Ultrasonic testing of concrete hardening in pile foundations

Journal of Physics Conference Series (2021)

Елизавета Лосева А. И. Потапов A.I. Osokin

Abstract This article discusses the ultrasonic method for monitoring the strength of concrete in piles. Geotechnical conditions of the city territory are indicated. The conditions of hardening of the concrete mixture in the pile shaft and the normal conditions of hardening of concrete samples are described. A detailed description of the control technique is given. The dependence of the ultrasonic wave propagation velocity on the age of concrete in piles and concrete samples is established. Based on the results of the work, it was concluded that it is possible to control the strength of concrete in-situ.

Hardening (computing)

10.1088/1742-6596/1728/1/012011

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Citations (3)