Geotechnical and Geophysical Studies for Wind Farms in Earhquake-Prone Areas

Özçep, Ferhat; Guzel, Mehmet; Karabulut, Savaş

doi:10.5772/16470

Cited by 4 publications

(4 citation statements)

References 21 publications

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“…Geophysical methods such as the seismic refraction and electrical resistivity (RC) are used for the site investigation. Geophysical surveys are efficient and cost-effective in providing geotechnical information since they combine high-speed and accuracy in providing subsurface information over large areas (Wang 1979;Seed et al 1983;Luna andJadi 2000: Soupios et al 2005;Momoh et al 2008;Ozcep et al 2009;Akin Torinwa OJ et al 2009;Bozkurt and Kurtulus 2009;Kurtulus et al 2010). Site characterization is carried out for the construction of hydroelectric power plants in the Sakarya region located in the earthquake-prone areas to determine depth of bedrock, structural mapping and evaluation of subsoil competence.…”

Section: Introductionmentioning

confidence: 99%

Geophysical and Geotechnical Studies for Electric Power Plants Project at the Sakarya River Zone, Turkey

Bozkurt¹,

Endeş²,

Güven³

2017

Uygulamalı Yerbilimleri Dergisi

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Geophysical and geotechnical studies were conducted at a proposed hydroelectric power plants facility at a site north of Sakarya river D100(E-5) bridge in Adapazarı town of Sakarya city in Turkey. The study is aimed at evaluating the competence of the near surface formation as foundation materials. Geophysical and geotechnical methods of investigation were adopted. The geophysical investigation involved the Vertical Electrical Sounding (VES) technique using the Schlumberger configuration, seismic refraction and geotechnical investigative methods comprised of boreholes to 40 m depth with Standard Penetrating Testing (SPT) and undisturbed Shelby tube, disturbed Split Spoon soil sampling, triaxial compresssion and consolidation tests. A total of five Vertical Electrical Soundings (VES) and five seismic refraction profiles from different location within the study area were used for the study. Water content, plasticity, and grain size distribution characteristics are obtained from laboratory testing leading to a classification of soils using the Unified Classification System. The geophysical results revealed three distinct geoelectric sequences which comprises of topsoil, weathered and partially weathered layers. The topsoils composed of clay/silt/sand while the weathered layer composed of silty sand. The partially weathered layer is formed of silty clay. The geotechnical results show that the partly weathered layer has relatively high clay content. Based on the consistency limits of the soils within the area, the soil generally indicate firm plasticity, hence, the soils are expected to exhibit medium swelling potential. There is no evident of geological feature such as fracture/fault within the subsoil in the area.

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Section: Introductionmentioning

confidence: 99%

Geophysical and Geotechnical Studies for Electric Power Plants Project at the Sakarya River Zone, Turkey

Bozkurt¹,

Endeş²,

Güven³

2017

Uygulamalı Yerbilimleri Dergisi

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“…However, the nonlinear behavior of the geomaterials, the dynamic pore pressure, and the liquefaction of soil during earthquake loading cannot be considered in the p-y method. No consensus exists in the industry, and there is significant interest in improving prediction of the behavior of wind turbine jacket foundations subjected to seismic loading [13][14][15]. Since the analysis of the wind turbine foundation using the effective stress method with the consideration of earthquakes is still not currently popular, we conducted our investigation of the bearing capacity of the jacket foundation pile for an offshore wind farm using effective stress analysis with the consideration of the pore pressure generation and soil/liquid coupled analysis.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Load Bearing Characteristics of Jacket Foundation Piles for Offshore Wind Turbines in Taiwan

Chien

2016

Energies

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This paper presents a pioneering study on numerical modeling of load bearing characteristics of the jacket foundation pile for offshore wind turbines on the west coast of Taiwan. Because Taiwan is located in an earthquake prone area, there is significant interest in improving the prediction of the behavior of wind turbine jacket foundations subjected to seismic loading. Investigation of the bearing capacity of the jacket foundation pile for the offshore wind farm using effective stress analysis, with consideration of pore pressure generation and soil/liquid coupled analysis, was conducted. A new procedure to evaluate the design of offshore wind turbine foundation piles in the sand and clay inter-layered soil was also proposed. Static and dynamic analyses of bearing capacity of the jacket foundation pile were conducted. Results obtained demonstrate that the design process for the jacket foundation pile proposed in this study can properly reflect the interaction behavior of the foundation and the soil. In addition, the pore pressure generation model can be used to simulate soil liquefaction. The proposed method is also very useful in the evaluation of the design capabilities of offshore wind turbine jacket foundations.

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“…These correlations could be used to give rather accurate predictions on the geotechnical properties for construction purposes. By comparing the different properties, indications may be obtained where the optimum soil/rock conditions for a certain site are to be encountered [1,2,3,4,5].…”

Section: Introductionmentioning

confidence: 99%

Studying Soil Undrained Shear strength Due to Driving Piles Using Seismic Cross-Hole Technique

Karim¹,

AL-Qaissy²,

Hasan³

2014

ETJ

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The study is intended for geotechnical engineers who deal with the construction of deep foundations using driving piles with the implementation of seismic cross-hole technique to estimate the accompanying increase (or decrease) in soil shear strength. The study concluded that there is a direct relation between the increases in soil undrained shear strength with 3 4 T yield stress ratio3 4 T and reverse relation with 3 4 T moisture water content and void ratio. The3 4 T increase in undrained shear strength is observed in the clay soil layer at 3-5 m in depth with low 3 4 T moisture content and void ratio due to the effect of time3 4 T . 3 4 T While at depth of 1-3 m, the reverse was noticed, this decrease is attributed to the upward displacement of the soil due to shear force from driven pile and then leading to increase the soil moisture content and void ratio. The study also concluded that an increase in undrained shear strength and yield stress ratio causing a decrease in void ratio and moisture content due to the effect of aging factor.1 2 T The present results have provided good overall views of the shear strength increases and their distributions and the estimated values are also of the right sizes.

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Geotechnical and Geophysical Studies for Wind Farms in Earhquake-Prone Areas

Cited by 4 publications

References 21 publications

Geophysical and Geotechnical Studies for Electric Power Plants Project at the Sakarya River Zone, Turkey

Geophysical and Geotechnical Studies for Electric Power Plants Project at the Sakarya River Zone, Turkey

Modeling of Load Bearing Characteristics of Jacket Foundation Piles for Offshore Wind Turbines in Taiwan

Studying Soil Undrained Shear strength Due to Driving Piles Using Seismic Cross-Hole Technique

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