Study Of The Insert-box Sea-road Structure

The sea-road is a shortcut to the exploitation of undersea oil on land, it can notonly shorten the oil transportation time and reduce the related expenses, but alsogreatly reduce security risk. But the traditional structure form of the sea-road stillexist shortcomings and drawbacks on structural performance and construction.The insert-box sea-road structure is a new sea-road structure which is moremature, perfect, economical, practical, flexible, quick, safe and environmentallyresponsible. Although the test section of the new structure has been constructed inDagang offshore, but there is no standard or criterion for design and related researchresults are also less. At present, the construction of offshore road-island structure hasproblems in design, construction difficulty, long construction period and other issues.And it needs study on the standard of design and construction to satisfy rapid,efficient development of offshore oilfield. According to the Zhangdong sea-roadengineering background of Dagang oilfield beach region, by using the finite elementsoftware ABAQUS, this paper has studied the forces of the insert-box sea-roadstructure, sums up the calculation method which can guide the engineering design andconstruction, and it has a certain practical value.First of all, horizontal load and vertical load bearing capacity experiment of theinsert-box sea-road has been done with the physical model. Comparing the measuredvalue of the experiment with the one of the ABAQUS simulation, the results showgood effect that the Mohr-Coulomb model of the finite element software ABAQUSis able to simulate the effect of the insert-box sea-road structure to soft ground, andthe bearing capacity can be calculated.Secondly, based on the finite element software ABAQUS, combined withZhangdong sea project engineering background of the Dagang oilfield beach area, theinsert-box sea-road structure has been simulated. In two different conditions, thestructural lateral earth pressure and the foundation stress of structure bottom wereanalyzed, and it is concluded that the instability and failure mechanism of theinsert-box sea-road structure. Then, various forces extracted from the ABAQUS model was compared with thethe results of the algorithm accepted in engineering. And modify it to apply in theinsert-box sea-road structure and the weak geological soil condition.At last, the original design schemes in four different bottom elevation wereoptimized by using finite element software. Comparing the cost with the cost of thetraditional riprapping sea-road, it is concluded that the insert-box sea-road structurecan save the cost in a certain extent.In summary, this paper has studied the horizontal and vertical bearing capacity ofthe insert-box sea-road structure in soft ground, modified the classical algorithm, andoptimized the structures under different soil surface elevation. The result has greatsignificance to the promotion and application of the insert-box sea-road structure.