Recommendations for Ground Vibrations Survey in Course of Geotechnical Works

Brząkała, W.

doi:10.5593/sgem2014/b12/s2.095

Cited by 4 publications

(4 citation statements)

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“…The structure response should not be underestimated, and buildings must remain safe during dynamic excitation. Extensive comparison studies of threshold values according to different codes can be found in the literature [16][17][18][19][20]. Some general remarks on sensor arrangement are given in different codes and standards.…”

Section: Introduction: the Importance Of The Analysed Problemmentioning

confidence: 99%

“…For each separate ith impact, the function Pi(t) can be described as In this paper, the results of the soil response are presented in the form of velocity components in three orthogonal directions (x, y, and z). According to different European standards [12,14,16,20], the PPV (peak particle velocity) can be calculated. The PPV describes the intensity of ground vibration and can be used to determine the level of structural safety by comparison with threshold values.…”

Section: Introduction: the Importance Of The Analysed Problemmentioning

confidence: 99%

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On a Sensor Placement Methodology for Monitoring the Vibrations of Horizontally Excited Ground

Herbut

Rybak

Brząkała

2020

Sensors

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In this paper, the problem of optimal sensor arrangement during vibration monitoring is analysed. The wave propagation caused by horizontal excitation is investigated to predict the areas of the largest ground and structure response. The equations of motion for a transversally isotropic elastic medium with appropriate absorbing boundary conditions are solved using the finite element method (FlexPDE software). The possibility of an amplified soil medium response is examined for points located on the ground surface and at various depths. The results are presented in the form of a dimensionless vibration reduction factor, defined as the ratio of the peak particle velocity observed at the selected depth to the corresponding value observed at the ground surface. Significant amplifications (≈50%) can be observed below the ground surface, especially in the case of a weak layer below a stiff layer. The effect of vibration amplification is most significant near the boundary surface of two layers. For the points located on the ground surface, the greatest peak particle velocities are observed in the direction perpendicular to the load direction. However, the greatest vertical velocity component at the ground surface is observed in front of the applied force.

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Section: Introduction: the Importance Of The Analysed Problemmentioning

confidence: 99%

Section: Introduction: the Importance Of The Analysed Problemmentioning

confidence: 99%

On a Sensor Placement Methodology for Monitoring the Vibrations of Horizontally Excited Ground

Herbut

Rybak

Brząkała

2020

Sensors

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“…The works generating vibrations are an example of works which could affect other ones in close vicinity. Exemplary cases when geotechnical works affect surroundings of construction site are shown in references [1][2][3][4]. Harmful impacts, for instance, include pile driving [5], dynamic substrate compaction and blasting works [6].…”

Section: Introductionmentioning

confidence: 99%

How vibrations affect steel-to-concrete adherence

2018

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In view of location and tight work schedule of civil projects, more and more frequently the various kinds of work overlap each other in space and time. Hence, their interactions need to be anticipated. An example of such works are pile driving which generate vibrations, which begs a question whether and to what extent they affect proper operation of other structures being constructed at the same time, e.g. reinforced concrete elements. This paper deals with the problem of steel-to-concrete adherence in reinforced concrete elements by providing mechanism of adherence destruction, methods use to determine adherence stresses and outlining analytical and numerical methods. Examinations on how vibrations affect fresh concrete mix are provided in the latter part of the paper. At the end, further direction for development is discussed.

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“…The author's experience from vibration monitoring [7] (Figure 1), i.e. a narrow section of measuring work which accompanies execution of specialist geotechnical works, points out enormous psychological importance of these works.…”

Section: Execution Of Geotechnical Work -Impact Monitoringmentioning

confidence: 99%

Role to Be Played by Independent Geotechnical Supervision in the Foundation for Bridge Construction

Sobala

Rybak

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Some remarks concerning the necessity of employing an independent and over all ethical geotechnical survey were presented in the paper. Starting from the design phase, through the whole construction process, the importance of geotechnical engineer is stated in legal acts. Numerous testing technologies serve for the calibration of geotechnical technologies and allow for confirming the quality and capacity of piles. Special emphasis was payed to the involvement of scientifical and research institutions which can not only serve services but also can postprocess and methodize collected data. Such databases enable for new codes, methods and recommendations. Selection of deep foundations for bridge-type structures is most often dependent on complex geotechnical conditions, concentrated loads and constraints for pier displacements. Besides the last ones, prior to more common introduction of the designconstruct system, could be a convenient justification for design engineer, who imposed deep foundation because he did not want or was not able to estimate the effect of pier settlement on civil engineering structure. The paper provides some notes about the need to engage a geotechnical supervising service of high competency and ethical quality during engineering and construction stages of foundations for bridge-type structures where legal requirements are of special consideration. Successive stages of projects are reviewed and research methods used for current calibration of geotechnical technologies and verification of geotechnical work quality are analysed. Special attention is given to potential involvement of independent R&D institutions which, apart from rendering specific services, also collect and systemize the research results thus enabling, in the long term, to revise engineering standards, instructions and guidelines.

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Recommendations for Ground Vibrations Survey in Course of Geotechnical Works

Cited by 4 publications

References 0 publications

On a Sensor Placement Methodology for Monitoring the Vibrations of Horizontally Excited Ground

On a Sensor Placement Methodology for Monitoring the Vibrations of Horizontally Excited Ground

How vibrations affect steel-to-concrete adherence

Role to Be Played by Independent Geotechnical Supervision in the Foundation for Bridge Construction

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