Creep characteristics and pore water pressure changes during loading of water storage tank on soft organic soil

Hameedi, Mudhafar K.; Fattah, Mohammed Y.; Al-Omari, Raid R.

doi:10.1080/19386362.2019.1682350

Cited by 14 publications

(3 citation statements)

References 14 publications

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“…Besides, the current research on the relationship between the organic matter and the engineering properties of clays is still concentrated in a relatively small range (0% ≤ OC ≤ 20%) [11][12][13][16][17][18][19]. For example, Hameedi et al [20,21] and Fattah et al [22] studied the engineering properties of clay with organic matter content of 2∼15% in southern Iraq. However, for special clays such as organic soil and peat, the content of soil organic matter mostly exceeds 20% [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Influence of Organic Matter Content on Engineering Properties of Clays

Gui

Zhang

Qin³

et al. 2021

Advances in Civil Engineering

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Most natural sedimentary clay contains organic matter, and even a small amount of organic matter will have a great impact on the physical and mechanical properties of clay. In order to clarify the influence of organic matter content on clay soil, the illite-quartz mixture was mixed with natural amorphous peat soil (organic matter content is 50%) in different proportions for studying the influence of different organic matter contents on the physical properties (specific gravity, Gs; moisture content, w ; void ratio, e; liquid limit, w L ; plastic limit, w p ; plasticity index, Ip) and shear characteristics (cohesion, c; friction angle, φ) of clay soil. The experimental results found that, with the change of organic matter content, the specific gravity and void ratio of clay changed linearly, while the water content, Atterberg limit, shear strength, cohesion, and friction angle changed nonlinearly with the increase of organic matter content. Moisture content and Atterberg limit have a turning point when OC = 7.5%. Shear strength, cohesion, and friction angle all have obvious turning points when OC = 7.5% and OC = 37.5%. The variation of moisture content and Atterberg limit with organic matter content indicates that OC = 7.5% may be the limit value for the different forms of organic matter in the clay. When OC ≤ 7.5%, the organic matter in clay is in the bound state; when OC > 7.5%, the bound organic matter reaches saturation; and the free organic matter gradually increases. The change law of shear strength characteristics with organic matter content shows that the interaction between minerals and organic matter exhibits different shear characteristics under different organic matter content. When OC ≤ 7.5%, clay shows mineral properties, when 7.5% < OC ≤ 37.5%, clay shows mineral-free organic matter properties, and when OC > 37.5%, clay shows free organic matter properties.

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Section: Introductionmentioning

confidence: 99%

Influence of Organic Matter Content on Engineering Properties of Clays

Gui

Zhang

Qin³

et al. 2021

Advances in Civil Engineering

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“…It is far less time-consuming and has a low operating cost than the traditional K0 estimate methods. Furthermore, the determination of initial conditions of any clayey soil, especially organic clays, is very important in specifying the states of stresses, as argued by Hameedi et al [57].…”

Section: K0 From Empirical Equationsmentioning

confidence: 99%

Measurement of the Lateral Earth Pressure Coefficient of Clayey Soils by Modified Oedometer Test

Alkhafaji¹,

Fattah²,

Al-Recaby³

2022

ETJ

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“…Following the assumption of a constant length of the iteration step, the optimal value of 𝑐 𝑣 is increased by 9.32%, 18.56% and 27.96%, respectively, to obtain a theoretical curve that fits the experimental curve in the later stages of consolidation. Based on previous findings on the occurrence of creep during pore water pressure dissipation (e.g., [36][37][38][39][40]), one would be led to the conclusion that creep and dissipation processes act concurrently during consolidation. However, in the early stages of consolidation, the effects of creep are imperceptible and can be visibly noted in the late stages.…”

Section: Optimization Of the Dissipation Datamentioning

confidence: 99%

Archives of Civil Engineering

Olek

2022

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The pattern of pore water pressure dissipation from the one-dimensional consolidation test significantly affects the calculated value of the coefficient of consolidation. This paper discusses the interpretation methodology for laboratory dissipation data from the oedometer test with the pore water pressure measurements or Rowe cell test. In the analysis, the gradient-based algorithm for finding the optimal value of the coefficient of consolidation is used against experimental results, obtained for various fine-grained soils. The appropriate value of coefficient of consolidation is considered as one with the lowest associated error function, which evaluates fitness between the experimental and theoretical dissipation curves. Based on the experimental results, two different patterns of the pore water pressure dissipation are identified, and the saturation of the specimen was found to be the key factor in describing the change in the patterns. For the monotonically decreasing dissipation curve, an inflection point is identified. The values of degree of dissipation at the inflection point are close to the theoretical value of 53.4%.

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Creep characteristics and pore water pressure changes during loading of water storage tank on soft organic soil

Cited by 14 publications

References 14 publications

Influence of Organic Matter Content on Engineering Properties of Clays

Influence of Organic Matter Content on Engineering Properties of Clays

Measurement of the Lateral Earth Pressure Coefficient of Clayey Soils by Modified Oedometer Test

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