Geotechnical characterization of soft soil deposits in Northern Poland

Konkol, Jakub; Międlarz, Kamila; Bałachowski, Lech

doi:10.1016/j.enggeo.2019.105187

Cited by 20 publications

(9 citation statements)

References 22 publications

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“…Another question is related to the CPT soil classification system–based on soil type behavior–in which some organic soils are presented as intermediate soils. The limited applicability of CPTu-based classifications for organic soils at this site was already argued by Bałachowski et al (2019) [ 11 ]. Thus, the novelty of the present approach considers the check of new design methods in organic soils not properly classified by CPT soil classification systems.…”

Section: Introductionmentioning

confidence: 83%

“…Modified UniCone soil type: 1b—soft clay and silt, 2a—silty marine and varved clays, 2b—stiff weathered clay, clay till, 3a—firm to medium soft silty clay, 4a—sandy silt, medium dense silt, 5b—Medium dense sand, 5c—dense sand. Laboratory-based soil profile [ 11 ]: CL—clay of low plasticity, ML—silt of low plasticity, OH—organic soil of high plasticity, OL—organic soil of low plasticity, Pt—peat, SM—silty sand, SW—well-grade sand.…”

Section: Figurementioning

confidence: 99%

“…In this way, the appropriate formula chosen to calculate skin friction can be directly related to the CPT soil classification system. This new approach was used for the modern technology of screw displacement piles applied in organic soil conditions including organic clay, mud and peat layers [ 11 ]. One of these soil classification systems, used in this study, is the Robertson chart [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Pile Shaft Capacity in Tension Based on Some Direct CPT Methods—Vistula Marshland Test Site

Zwara

Bałachowski

2022

Materials

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This paper presents different CPT methodologies for the prediction of the pile shaft resistance in tension on the example of three reference screw piles of the Jazowa test site in Poland. The shaft capacity was estimated based on the cone resistance, sleeve friction and CPT excess pore water pressure. Three piles with a diameter of 0.4 m and the length varied from 8 m to 14.6 m were subjected to static load tests in tension. Their results were used to determine the ultimate bearing capacity of the reference piles. The pile shaft resistance was estimated according to the AFNOR standard, Doan and Lehane 2018 centrifuge tests based method (Delft University of Technology approach), the Modified Unicone method, KTRI (Kajima Technical Research Institute) and LCPC (Laboratoire Central des Ponts et Chaussées) method. Then, the ultimate bearing capacity determined in static load tests was compared to the estimated values according to five different methods. The best estimation, fitting almost perfectly to static load test values, was obtained with the AFNOR method, whereas the other predictions significantly underestimated the ultimate bearing capacity.

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Section: Introductionmentioning

confidence: 83%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prediction of Pile Shaft Capacity in Tension Based on Some Direct CPT Methods—Vistula Marshland Test Site

Zwara

Bałachowski

2022

Materials

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“…The cohesive soils taken under consideration in this paper are (1) silty loam, (2) organic clay, (3) organic silt, and (4) peat. These soils are commonly occurring in the Vistula Marshlands, Northern Poland [ 28 ]. All tested soils are normally consolidated.…”

Section: Soils Used In Interface Testingmentioning

confidence: 99%

Some Aspects of Shear Behavior of Soft Soil–Concrete Interfaces and Its Consequences in Pile Shaft Friction Modeling

Konkol

Mikina

2021

Materials

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This paper examines the stiffness degradation and interface failure load on soft soil–concrete interface. The friction behavior and its variability is investigated. The direct shear tests under constant normal load were used to establish parameters to hyperbolic interface model which provided a good approximation of the data from instrumented piles. Four instrumented piles were used to obtain reference soil–concrete interface behavior. It was found that the variability of the friction characteristics is the highest for organic clays and the lowest for organic silts. The intact samples exhibit lower shear strength than reconstituted ones. The adhesion varies significantly depending on interface and soil type, which can result in high scatter of the skin friction prediction. The analysis of parameters variability can be used to determine the upper and lower bound of friction behavior on the interface at constant normal load condition. The backward shearing results in decrease in shear strength up to 40% of the precedent forward phase but higher initial stiffness by a factor of between 2 and 3. Presented research provides basic shear and stiffness parameters for four soft soils (organic clay, organic silt, peat, and silty loam) and gives information about variability of interface characteristics.

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“…3.21, la cual muestra que la resistencia no drenada en compresión fue determinada usando el concepto de la mecánica crítica del suelo. La pendiente (M) de la línea de estado crítico en compresión (Kempfert y Gebreselassie, 2006;Konkol et al, 2019) se obtiene mediante la expresión:…”

Section: Resistencia Al Corte No Drenadaunclassified

Estudio experimental y numérico del comportamiento de excavaciones ejecutadas mediante la técnica de suelo claveteado (soil nailing) en suelos de la ciudad de Quito (Ecuador).

Guachón¹,

Vicente²

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The "Soil Nailing" technique is a ground reinforcement procedure used consistently to stabilize slopes and land sections in geotechnical engineering projects. This technique is frequently used in the city of Quito (Ecuador) to reinforce the ground and improve slope stability during the excavation process for various underground parking levels. Such deep excavations are common in the city's most important real estate projects, in which "Soil Nailing" is used with different variations that are adjusted in accordance with the construction resources available in the particular environment. Despite its widespread use, this technique which has proven to be so effective in stabilizing excavations during the construction of underground structures in the soils of the city of Quito, currently suffers from a lack of local theoretical, numerical or experimental research based on the geotechnical properties of the city's characteristic soils.

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Geotechnical characterization of soft soil deposits in Northern Poland

Cited by 20 publications

References 22 publications

Prediction of Pile Shaft Capacity in Tension Based on Some Direct CPT Methods—Vistula Marshland Test Site

Prediction of Pile Shaft Capacity in Tension Based on Some Direct CPT Methods—Vistula Marshland Test Site

Some Aspects of Shear Behavior of Soft Soil–Concrete Interfaces and Its Consequences in Pile Shaft Friction Modeling

Estudio experimental y numérico del comportamiento de excavaciones ejecutadas mediante la técnica de suelo claveteado (soil nailing) en suelos de la ciudad de Quito (Ecuador).

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