Some Effects of Intrinsic Cyclic Loading in Saturated Sands

Sawicki, Andrzej; Mierczyński, Jacek

doi:10.15632/jtam-pl.53.2.285

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…Perhaps the wave-induced pressures at the mudline are so strong that they cause effects which are beyond the scope of soil mechanics research. They may be associated with the intrinsic changes in pore pressure and the related mechanisms described in Sawicki [5], Sawicki and Mierczyński [6], Sawicki et al [7]. These problems will be discussed in detail in subsequent sections.…”

Section: Comments and Questionsmentioning

confidence: 97%

Theoretical Analysis of Model Seabed Behavior under Water Wave Excitation

Sawicki

Mierczyński

Smyczyński

2015

Studia Geotechnica Et Mechanica

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Theoretical analysis of the behavior of a model seabed subjected to water wave excitation is presented. The experiments were performed in the wave flume at the Danish Technological University in Lyngby. Such experiments are unique in engineering sciences and therefore provide unique empirical data for testing various models of the seabed. A controversial explanation of the experiments is presented in the literature. The goal of this research was to study pore pressure changes caused by water waves and the subsequent liquefaction of the seabed. The authors of the present contribution offer their own theoretical explanation of the wave flume experiments and discuss errors found in the literature cited. The analysis is based on the classical soil mechanics, including the Biot type approach.

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Section: Comments and Questionsmentioning

confidence: 97%

Theoretical Analysis of Model Seabed Behavior under Water Wave Excitation

Sawicki

Mierczyński

Smyczyński

2015

Studia Geotechnica Et Mechanica

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“…The instability line defines the stress level that triggers undrained instability under monotonic or cyclic loading conditions [9,[17][18][19][20]. From a practical point of view, the instability line delimits the condition in which a soil element cannot hold a prescribed stress level, causing a rapid increase in deformations [21].…”

Section: Introductionmentioning

confidence: 99%

Effects of initial stress anisotropy on the onset of undrained instability for Guamo sand

Prada-Sarmiento

Ramos-Cañón

Tauta

2022

Rev.Fac.Ing.Univ.Antioquia

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Undrained instability is a failure mode that has been observed in many sandy slopes. However, the highly anisotropic stress states caused by the geometry of the slope have not been duly considered from the experimental point of view. This article studies the influence of the initial stress anisotropy of laboratory samples on the static undrained instability of the Colombian reference sand. Forty-five consolidated undrained triaxial tests were performed, prescribing combinations of different initial void ratios, mean confining pressure, and initial stress ratios. Experimental results allow concluding that: a. the size of the instability zone on the p′ − q plane becomes smaller for larger initial anisotropic stress ratios; b. a novel undrained instability plane can be proposed in the p′ − q − e space to set a boundary between stable and unstable undrained loading conditions; c. mean confining pressure plays a vital role in the estimation of undrained instability for Guamo sand samples under low and medium confining stresses; d. despite multiple factors that influence the onset of undrained instability, a relation can be derived between the undrained instability susceptibility of sandy slopes and the initial stress ratio η0.

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“…Така ситуація могла скластися внаслідок розпушування ґрунту зворотної засипки траншеї і інфільтрація через неї атмосферних опадів до ІГЕ 5. Також могла мати місце ситуація виконання зворотної засипки і як наслідок навантаження замоченого ґрунту ІГЕ 5, котрий отримав Реальне зрушуюче напруження, одержане за розрахунками, зіставляється із граничним опором зрушенню і результат цього порівняння виражається у вигляді коефіцієнта запасу стійкості K. Коефіцієнт запасу стійкості схилу (укосу) -це мінімальний з коефіцієнтів запасу стійкості по всіх можливих поверхнях ковзання, що задовольняють заданим обмеженням, закладеним у методі розрахунків [14,15].…”

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The impact of complex engineering and geological conditions on the durability of the polymer pipeline

Aleksandrovych

Havryliuk

Sukhov

2022

Visnyk of V.N. Karazin Kharkiv National University, Series Geology. Geography. Ecology

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Formulation of the problem. During the construction of the oil collector, in order to ensure uninterrupted transportation of products, it was planned to lay an industrial oil collector made of fiberglass pipes. In some areas, repeated depressurization of the joints of the fiberglass oil collector occurred. In this regard, there was a need for a comprehensive approach to establishing the causes of the aerial situations. The purpose of the article is to analyze the impact of complex engineering and geological conditions on the durability of the polymer pipeline using the example of an industrial oil collector made of fiberglass pipes of the Anastasiv deposit, located in the territory of the Romen district of the Sumy region of Ukraine. Materials and methods. To achieve the goal, a visual survey of the geological and geomorphological structure was performed, as well as the analysis of the engineering and geological conditions of the territory where the fiberglass pipeline is laid. Soil samples were taken from the place of depressurization of the polymer pipeline joint, and their physical and mechanical characteristics were determined. Modeling and calculation of the stability of the slope on which the depressurization of the joint of the polymer pipeline occurs, were carried out by the finite element method. Results. During the examination of the fiberglass pipeline, negative and potentially negative factors of the engineering and geological conditions influence on the laying and operation of fiberglass collectors were established. It was revealed that there was a discrepancy between the design decision and the actual layout of the fiberglass pipes, which could lead to the occurance of areas of "sag" and, as a result, an increase in the stresses in the pipeline from the backfill load. At the same time, the realization of subsidence phenomena of IGE 5 after laying the pipeline also led to additional non-design stresses. The analysis of engineering-geological and hydrogeological conditions indicates the possible activity of slope processes in the study area, which leads to a violation of the stability of the slope and, consequently, the occurrence of additional displacement and stresses due to,deformation of the soil massif. Scientific novelty and practical significance. The necessity of conducting engineering-geological surveys to assess the impact of complex engineering and geological conditions on the durability of a polymer pipeline is substantiated. The main negative processes and phenomena that led to emergency situations on the territory of laying the polymer pipeline were identified.

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Some Effects of Intrinsic Cyclic Loading in Saturated Sands

Cited by 5 publications

References 7 publications

Theoretical Analysis of Model Seabed Behavior under Water Wave Excitation

Theoretical Analysis of Model Seabed Behavior under Water Wave Excitation

Effects of initial stress anisotropy on the onset of undrained instability for Guamo sand

The impact of complex engineering and geological conditions on the durability of the polymer pipeline

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