A numerical model for pipelaying on nonlinear soil stiffness seabed

Zan, Yingfei; Yang, Chi; Han, Duanfeng; Yuan, Lihao; Li, Zhigang

doi:10.1016/s1001-6058(16)60603-0

Cited by 17 publications

(4 citation statements)

References 14 publications

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“…There is no review work on this area after Scholey et al (1995) and Yimsiri and Soga (2002). Nowadays there exist sophisticated ground movement assessment models that require more accurate small strain data (Zan et al, 2016). The paper will help in selecting the suitable instrumentation setup that will provide more reliable data for optimum performance and prediction of these models.…”

Section: Introductionmentioning

confidence: 99%

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

Isah¹,

Civil²,

Mohamad³

et al. 2018

Int. j. adv. appl. sci.

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Accurate determination of soil stiffness at small strain (0.001 % -0.1 % strain) is very important as it portrayed the stiffness of soil underneath geotechnical structures. To evaluate stiffness at small strain, it is important to achieve a minimum strain measurement accuracy of 10-4 %, this is attained using transducers, strain gauges and sensors which are attached on the specimen locally inside the triaxial cell. Several local strains measuring techniques have emerged with the intention of developing a seamless system which is easy, accurate and less expensive. This study epitomizes the existing types of small strain measuring instrumentation, their trend of development and technology. Those that can measure both axial and radial strain, axial strain alone and radial strain alone are distinguished and described. Also, the accuracy, features, merits, and demerits of each type of device have been discussed accordingly. This paper provides information that enables selection of a suitable device that will best fit a particular application. It is anticipated that the study will inspire further researches in the area.

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Section: Introductionmentioning

confidence: 99%

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

Isah¹,

Civil²,

Mohamad³

et al. 2018

Int. j. adv. appl. sci.

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“…Therefore, the marine environment analyzed by the submarine pipeline-laying system is set as level IV sea conditions. In addition, the flexible pipeline will be subject to the reaction from the seabed, which is linearly related to the depth of the pipeline sinking into the seabed [29]. Therefore, the setting of marine environment parameters is shown in Table 2.…”

Section: Operating Parametersmentioning

confidence: 99%

Scaled Model Simulation and Experimental Verification of Submarine Flexible Pipeline Laying System

et al. 2021

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In order to adapt to the complex and changeable marine environment such as wind, wave, and current, the physical simulation experiment is usually needed in the design of a deep-sea flexible pipeline-laying system. In reality, the flexible pipeline-laying system is very large, and the experimental cost is huge. Therefore, when analyzing this system, it is necessary to carry out scaled model experiments to verify the rationality of it. Taking the flexible pipeline-laying system working under four-level sea conditions as an example, this paper deduces the similarity criteria of the scaled model according to the similarity theory. According to the required experimental site, the sizes and materials of the model are selected, and then the physical quantities of the model and their similarity ratio corresponding to the prototype are determined. According to the physical quantities of the experimental model, the similarity of dynamic characteristics and structural strength between the model and the prototype are verified by Adams and ANSYS Workbench. The research shows that the scaled model and prototype based on similarity theory can meet the established similarity relationship, and the scaled model experiment is an effective way to verify the rationality of the design of a flexible pipeline-laying system.

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“…The Flex-lay operation should be capable of performing under the conditions of fourth-level sea state, so the marine environment of pipeline dynamic analysis is set to the fourth-level sea state. In addition, the flexible pipeline will be subject to the reaction force from the seabed, which is linearly related to the depth of the pipeline sinking into the sea floor [27]. Therefore, the parameters of the marine environment are set as shown in Table 1.…”

Section: Operating Parametersmentioning

confidence: 99%

Dynamic Behavior of the Deepwater Flexible Pipeline during Pipe Laying Process

Wang

Xing

et al. 2020

JMSE

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The dynamic behavior of the flexible pipeline during deepwater Flex-lay directly determines the structures of laying facilities and the actual installation process. A coupled dynamic model considering the effects of different factors was established in this paper. Based on the model, the initial attitude of the flexible pipeline during the laying process was determined by using the natural catenary theory and Morison equation. The hydrodynamic analysis of the HYSY201 pipelaying vessel was carried out by using the finite element software AQWA. Under the specific sea condition, a flexible pipeline with outer-diameter of 352.42 mm being laid onto the 3000 m deep seabed was simulated by using the software OrcaFlex to study the pipeline dynamic behaviors including axial tension, bending moment and stress-strain in the laying process, and the factors affecting the dynamic behavior of the pipeline were analyzed. The results show a significant correlation between the marine loads, vessel motion and the dynamic response of the pipeline. Compared with the static state case, the maximum axial tension, bending moment and stress-strain of the pipeline under the interaction of the marine loads and the vessel motion increased by 42.7%, 220%, 52% and 18.7%, separately. Among the marine loads, the surface wave had the most significant effect on the dynamic performance of the pipeline. When the wave direction acts on the width of the ship, the wave height is greater than 2 m and the spectrum period is eight seconds, the wave has the greatest influence on the dynamic response of the pipeline.

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A numerical model for pipelaying on nonlinear soil stiffness seabed

Cited by 17 publications

References 14 publications

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

Scaled Model Simulation and Experimental Verification of Submarine Flexible Pipeline Laying System

Dynamic Behavior of the Deepwater Flexible Pipeline during Pipe Laying Process

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