Consulting & Advisory reports by Senol Ozmutlu
LWI; Visualisatie 3D-GIS; 520; COB; L 300, Monitoring graaffront boorproces; 3.8: Integratieplatform, p 79, 2000
In 1996 is een begin gemaakt met de bouw van de Tweede Heinenoordtunnel, als op1ossing voor de ca... more In 1996 is een begin gemaakt met de bouw van de Tweede Heinenoordtunnel, als op1ossing voor de capaciteitsproblemen op de A29. Deze tunnel, de eerste geboorde verkeerstunnel in Nederland, is in 1999 gereed gekomen als doorgangsroute voor langzaam verkeer. Aangezien dergelijke projecten in de toekomst vaker zullen worden uitgevoerd (bijvoorbeeld de Westerscheldetunne1 en de Noord/Zuidlijn in Amsterdam), is de Tweede Heinenoordtunnel tezamen met de Botlekspoortunnel tot praktijkproject benoemd. Dit houdt in dat voorafgaand aan en tijdens de bouw van de tunnel een scala aan metingen is verricht. De resultaten van deze metingen dienen in driedimensionale geografische informatie systemen (3D-GIS) geïntegreerd te kunnen worden om een kwalitatief goede interpretatie en modellering moge1ijk te maken. De bedoelde integratie van de verschillende metingen is inmiddels verricht in het project 'Visualisatie van driedimensionale datasets met behu1p van driedimensiona1e Geografische Informatie Systemen (3D-GIS)'. Dit is een gezamen1ijk project van de produktgroep 'Informatie en Communicatie Technologie' van het programma Land Water Milieu Informatie technologie (LWI) en van de commissie L 300 'Monitoring Graaffront Boorproces' van het Centrum Ondergronds Bouwen (COB). Het project behelst enerzijds de uitwisse1ing en conversie van databestanden en anderzijds de visualisatie van data om interpretatie, modellering en analyse te vereenvoudigen.
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Journal Papers by Senol Ozmutlu
Bulletin of Engineering Geology and the Environment, 65(2), pp 143-153, May 2006
Full three-dimensional modelling has been developed and is
implemented for many sites where engi... more Full three-dimensional modelling has been developed and is
implemented for many sites where engineering structures are built. Such computer models of the subsurface allow for a more sophisticated handling of subsurface data leading to, for example, better dimensioning of geotechnical units,
the evaluation of hazard and risk, foundation design, tunnel routing, planning and building, etc. Other applications are the back-analysis for completed civil engineering projects
to verify the correctness of assumed and estimated ground models and parameters, the verification of the correctness of constitutive models for ground behaviour and the use of back analysis to improve building methodologies or equipment. The
paper illustrates some of these advantages with a number of stateof- the-art applications of threedimensional modelling in engineering geology and geotechnical engineering,
highlighting a number of key issues when computer-aided 3D
modelling is used: the definition of geotechnical (homogeneous) zones, scale and detail, uncertainty and
likelihood of the developed model.
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Papers by Senol Ozmutlu
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Proceedings of Offshore Technology Conference, May 1, 2009
This paper introduces the model testing of drag embedment anchors under laboratory and offshore c... more This paper introduces the model testing of drag embedment anchors under laboratory and offshore conditions. As the anchors form the foundation of a floating unit (both permanent and temporary), the model tests help in designing new generation anchors with higher performance and reliability. Furthermore the physical models are used to test and simulate the anchor handling/installation procedures, and serve as powerful teaching aids for operating personnel offshore. The new directions in psychical model testing of offshore drag anchors are highlighted. The benefits of well controlled testing and the ability of measuring new anchor-ground interaction variables are discussed. It is shown that the new model testing programs will increase our current understanding of the anchor behavior and performance in operational and storm loading conditions. Introduction A special category of drag embedment anchors is a commonly used foundation option for offshore mooring of floating units (i.e. MODU, SPM, FPU, FSO, FPSO, etc.). The anchors in this category are labeled as High Holding Power (HHP) anchors owing to their very high efficiencies or performance ratios. The old generation drag anchors had efficiencies (i.e. the ratio of Ultimate Holding Capacity - UHC to dry dead weight of anchor) as low as 3, and had suffered from penetration and stability problems in slightly challenging subseabed soil conditions. Today, the modern HHP anchors have reached efficiencies over 65 by overcoming the penetration and stability issues thus presenting a reliable as well as practical and economical foundation solution in challenging soil conditions. This development would not be possible without continues testing of scaled model anchors in laboratory, in centrifuge, and under actual field conditions. This paper presents the model testing of both fluke (e.g. Stevpris - Stevshark series) and plate (e.g. Stevmanta VLA series) anchors (Figure 1) of drag embedment type. The drag embedment fluke anchors are commonly used in catenary mooring systems whereas the drag embedment plate anchors (i.e. Vertically Loaded Anchors - VLAs) are commonly chosen for semi-taut or taut-leg mooring systems. Both anchor types are installed by lowering the anchor to the seabed first and then by applying a pull load from a surface vessel (Vryhof 2005). The quantities given in this text, unless otherwise referenced in the text, refer to the in-house testing database and track record of the company that the author is affiliated with.
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This paper presents the development and the testing of a new anchor for hard seabed conditions. T... more This paper presents the development and the testing of a new anchor for hard seabed conditions. The anchor development involved computer modelling, laboratory scale model testing, and eventually the full scale anchor testing offshore. The goal of the development was to expand the suitability and applicability range of drag embedment anchors in hard soils and soft rocks. The anchor development process is explained and the theoretical models for hard ground anchoring are introduced. The laboratory testing conditions and the results of laboratory tests are presented. Following the model scale qualification phase in different soil types and strengths in the laboratory, the full scale testing of the new anchor is carried out at selected offshore locations. The offshore testing conditions, the instrumentation and measurement techniques, and the results of offshore testing are evaluated and presented. In order to benchmark the performance of the new anchor, both laboratory tests and field scale tests are run against a reference anchor which is tested under the same conditions. The model scale and field scale testing results show that the new anchor is able to penetrate into harder grounds and generate substantial holding capacity. The penetration ability and the stable holding capacity of the new anchor is around 22% to 47% higher than the existing anchors of comparable category. The offshore scale test results have proven that the new anchor has increased the offshore mooring capability in hard soils and soft rocks. It is expected that the results of this work will allow a better understanding of anchor behavior in hard soil and soft rocks. The results and the technology developed will be beneficial to the oil/gas and energy sectors in general and the offshore mooring industry in particular. The new technology is expected to provide a practical and cost effective anchoring solution in challenging frontier areas (e.g. Arctic, Northwest Shelf Australia, Persian Gulf, and many shallow water areas of the world), and in emerging industries like Floating Renewables and dredging/offshore construction.
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All Days, May 4, 2009
This paper introduces the model testing of drag embedment anchors under laboratory and offshore c... more This paper introduces the model testing of drag embedment anchors under laboratory and offshore conditions. As the anchors form the foundation of a floating unit (both permanent and temporary), the model tests help in designing new generation anchors with higher performance and reliability. Furthermore the physical models are used to test and simulate the anchor handling/installation procedures, and serve as powerful teaching aids for operating personnel offshore. The new directions in psychical model testing of offshore drag anchors are highlighted. The benefits of well controlled testing and the ability of measuring new anchor-ground interaction variables are discussed. It is shown that the new model testing programs will increase our current understanding of the anchor behavior and performance in operational and storm loading conditions. Introduction A special category of drag embedment anchors is a commonly used foundation option for offshore mooring of floating units (i.e. MODU, SPM, FPU, FSO, FPSO, etc.). The anchors in this category are labeled as High Holding Power (HHP) anchors owing to their very high efficiencies or performance ratios. The old generation drag anchors had efficiencies (i.e. the ratio of Ultimate Holding Capacity - UHC to dry dead weight of anchor) as low as 3, and had suffered from penetration and stability problems in slightly challenging subseabed soil conditions. Today, the modern HHP anchors have reached efficiencies over 65 by overcoming the penetration and stability issues thus presenting a reliable as well as practical and economical foundation solution in challenging soil conditions. This development would not be possible without continues testing of scaled model anchors in laboratory, in centrifuge, and under actual field conditions. This paper presents the model testing of both fluke (e.g. Stevpris - Stevshark series) and plate (e.g. Stevmanta VLA series) anchors (Figure 1) of drag embedment type. The drag embedment fluke anchors are commonly used in catenary mooring systems whereas the drag embedment plate anchors (i.e. Vertically Loaded Anchors - VLAs) are commonly chosen for semi-taut or taut-leg mooring systems. Both anchor types are installed by lowering the anchor to the seabed first and then by applying a pull load from a surface vessel (Vryhof 2005). The quantities given in this text, unless otherwise referenced in the text, refer to the in-house testing database and track record of the company that the author is affiliated with.
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This paper presents the mooring system supply and management model and the design of anchors for ... more This paper presents the mooring system supply and management model and the design of anchors for a semi-commercial Floating Offshore Wind Farm (FOWF): WindFloat Atlantic. A Project Management and Engineering (PME) model has been developed and employed for effective delivery of various components involved in the mooring package. The goal of the development is to prepare the mooring system supply chain and be ready for commercial scale FOWF developments. The anchors for the WindFloat Atlantic FOWF have been designed and installed with limited and sparse data. The anchor design and qualification methodology developed for the project is proven by the successful installation of anchors in record time. The overall mooring system supply process is explained and the critical elements on engineering, testing, certification, trial fits, documentation, and logistics are highlighted. The PME model for WindFloat Atlantic mooring project is introduced. The anchor design for the project is explained. The anchor design is based on a model developed for limited and sparse geo data. The engineering geological and geotechnical characterization with limited soil data, the definition of soil design bounds and identification of geotechnical risks are explained. The results show that the PME model is successful in the management of the numerous components, stakeholders, and interfaces. As a post project extension, the PME model is supplemented by an electronic equipment marking and identification system suitable for permanent mooring application. This extension is expected to improve HSEQ, traceability and identification therefore avoiding risks and increasing efficiency in farm scale mooring system deployments, inspections, and maintenances. The regulatory approval and the successful installation of anchors proves the effectiveness of the applied anchor design methodology. The results show that the anchor type selection and anchor sizing are highly dependent on the mooring design conditions, applicable class rules, and the geotechnical risks within the windfarm development area. The value of laboratory scale model testing under the simulated mooring tensions and in comparable soil conditions has been demonstrated as a further risk reduction measure before the actual offshore installation. The mooring system delivery and the offshore installation of the project anchors are completed successfully in a noticeably short time proving the effectiveness of the applied models and design methodologies. The PME model and the anchor design methodology developed for WindFloat Atlantic project are expected to improve the delivery time of the mooring system and anchors, and to reduce the cost of overall package for the farm scale FOW developments. It is expected that the experiences gained in this project and the methods developed will help accelerating the launch of the FOWF projects.
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Turkish Journal of Earth Sciences, 2010
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ABSTRACT
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SNAME 13th Offshore Symposium, 2004
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We present the development of an Intelligent Decision Support System (IDSS) for soft soil shield ... more We present the development of an Intelligent Decision Support System (IDSS) for soft soil shield tunnelling. The IDSS development involves a heterogeneous integration of 3D modelling, scientific visualisation, and artificial intelligence technology products for supporting decision-making in tunnelling projects. Modelling and geotechnical characterisation of soil volumes play a critical role in the determination of an applicable Tunnel Boring Machine (TBM) and its performance. The modelling of soil volumes was carried out interactively, using boreholes and Cone Penetration Test (CPT) logs as background information. We have experienced some difficulties in modelling the complex geology of the study area, which is a deltaic setting with discontinuous lenses and interfingering layers of sand, clay and peat. In order to overcome these difficulties, some improvements to current three-dimensional geo-information (3D-GIS) techniques are suggested. Geotechnical modelling was based on the site investigation data and the results of laboratory tests on soil samples. Soil property modelling was carried out using knowledge based approach on rectangular 3D grids. Presently the IDSS prototype allows users to effectively interact with the 3D-GIS, support the analysis and manipulation of geotechnical and mechanical parameters, and provide decision scenario and negotiation routines under varying tunnelling conditions.
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Lecture Notes in Earth Sciences
... The geo-statistical modelling process first involves a statistical analysis of measured sam-p... more ... The geo-statistical modelling process first involves a statistical analysis of measured sam-ple values in terms of primary statistics, histogram ... based system, ie reasoning on the basis of engineering geological knowledge by an expert (preferences and rules)(Attewell and Toll ...
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Bulletin of Engineering Geology and the Environment, 2005
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Day 2 Tue, May 03, 2022
This paper presents the mooring system supply and management model and the design of anchors for ... more This paper presents the mooring system supply and management model and the design of anchors for a semi-commercial Floating Offshore Wind Farm (FOWF): WindFloat Atlantic. A Project Management and Engineering (PME) model has been developed and employed for effective delivery of various components involved in the mooring package. The goal of the development is to prepare the mooring system supply chain and be ready for commercial scale FOWF developments. The anchors for the WindFloat Atlantic FOWF have been designed and installed with limited and sparse data. The anchor design and qualification methodology developed for the project is proven by the successful installation of anchors in record time. The overall mooring system supply process is explained and the critical elements on engineering, testing, certification, trial fits, documentation, and logistics are highlighted. The PME model for WindFloat Atlantic mooring project is introduced. The anchor design for the project is explain...
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Wind Energy, 2018
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Proceedings of Offshore Technology Conference, 2009
This paper introduces the model testing of drag embedment anchors under laboratory and offshore c... more This paper introduces the model testing of drag embedment anchors under laboratory and offshore conditions. As the anchors form the foundation of a floating unit (both permanent and temporary), the model tests help in designing new generation anchors with higher performance and reliability. Furthermore the physical models are used to test and simulate the anchor handling/installation procedures, and serve as powerful teaching aids for operating personnel offshore. The new directions in psychical model testing of offshore drag anchors are highlighted. The benefits of well controlled testing and the ability of measuring new anchor-ground interaction variables are discussed. It is shown that the new model testing programs will increase our current understanding of the anchor behavior and performance in operational and storm loading conditions. Introduction A special category of drag embedment anchors is a commonly used foundation option for offshore mooring of floating units (i.e. MODU, SPM, FPU, FSO, FPSO, etc.). The anchors in this category are labeled as High Holding Power (HHP) anchors owing to their very high efficiencies or performance ratios. The old generation drag anchors had efficiencies (i.e. the ratio of Ultimate Holding Capacity - UHC to dry dead weight of anchor) as low as 3, and had suffered from penetration and stability problems in slightly challenging subseabed soil conditions. Today, the modern HHP anchors have reached efficiencies over 65 by overcoming the penetration and stability issues thus presenting a reliable as well as practical and economical foundation solution in challenging soil conditions. This development would not be possible without continues testing of scaled model anchors in laboratory, in centrifuge, and under actual field conditions. This paper presents the model testing of both fluke (e.g. Stevpris - Stevshark series) and plate (e.g. Stevmanta VLA series) anchors (Figure 1) of drag embedment type. The drag embedment fluke anchors are commonly used in catenary mooring systems whereas the drag embedment plate anchors (i.e. Vertically Loaded Anchors - VLAs) are commonly chosen for semi-taut or taut-leg mooring systems. Both anchor types are installed by lowering the anchor to the seabed first and then by applying a pull load from a surface vessel (Vryhof 2005). The quantities given in this text, unless otherwise referenced in the text, refer to the in-house testing database and track record of the company that the author is affiliated with.
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Consulting & Advisory reports by Senol Ozmutlu
Journal Papers by Senol Ozmutlu
implemented for many sites where engineering structures are built. Such computer models of the subsurface allow for a more sophisticated handling of subsurface data leading to, for example, better dimensioning of geotechnical units,
the evaluation of hazard and risk, foundation design, tunnel routing, planning and building, etc. Other applications are the back-analysis for completed civil engineering projects
to verify the correctness of assumed and estimated ground models and parameters, the verification of the correctness of constitutive models for ground behaviour and the use of back analysis to improve building methodologies or equipment. The
paper illustrates some of these advantages with a number of stateof- the-art applications of threedimensional modelling in engineering geology and geotechnical engineering,
highlighting a number of key issues when computer-aided 3D
modelling is used: the definition of geotechnical (homogeneous) zones, scale and detail, uncertainty and
likelihood of the developed model.
Papers by Senol Ozmutlu
implemented for many sites where engineering structures are built. Such computer models of the subsurface allow for a more sophisticated handling of subsurface data leading to, for example, better dimensioning of geotechnical units,
the evaluation of hazard and risk, foundation design, tunnel routing, planning and building, etc. Other applications are the back-analysis for completed civil engineering projects
to verify the correctness of assumed and estimated ground models and parameters, the verification of the correctness of constitutive models for ground behaviour and the use of back analysis to improve building methodologies or equipment. The
paper illustrates some of these advantages with a number of stateof- the-art applications of threedimensional modelling in engineering geology and geotechnical engineering,
highlighting a number of key issues when computer-aided 3D
modelling is used: the definition of geotechnical (homogeneous) zones, scale and detail, uncertainty and
likelihood of the developed model.