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首页> 美国政府科技报告 >3-D Finite Element Calculation of Subsidence Induced Deformation of the Weeks Island Service Shaft
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3-D Finite Element Calculation of Subsidence Induced Deformation of the Weeks Island Service Shaft

机译：周岛服务井沉降诱发变形的三维有限元计算

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The Service Shaft at the Weeks Island SPR facility has experienced vertical and lateral movement since it was constructed in 1905. Movement of the shaft over the past few years has been confirmed through survey levels of the shaft collar and two plumbline surveys of the top 100 feet of the shaft. This 3-D finite element calculation was done to gain an understanding of the deformation of the Service Shaft due to the subsidence of the surrounding material. Subsidence at the site results from creep closure of the bi-level room-and-pillar salt mine which is currently the reservoir for 73 million-barrels of crude oil. The 3-D finite element model treats the southwest corner of the mine and contains 118 pillars on two levels of the mine. The deformation of the Service Shaft is determined from the displacement of a vertical line of nodes in the model which is assumed to be the axis of the Service Shaft. The calculation shows that the Service Shaft is tilting to the northeast and moving downward. The movement, however, is mostly a rigid body rotation and translation with very slight bending and stretching of the shaft. Because the bending and tensile strains are insignificant, this calculation indicates that rupture of the shaft is unlikely. 23 refs., 17 figs., 2 tabs. (ERA citation 13:017717)

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