›› 2012, Vol. 33 ›› Issue (7): 2067-2075.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Influence of soft interlayer on seismic response of casing string for deepwater production

ZHU Xing-ke1, 2, WANG Li-zhong1, GUO Zhen1, YUAN Feng1   

  1. 1. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2. CCCC Fourth Harbor Engineering Institute Co., Ltd., Guangzhou 510230, China
  • Received:2011-05-19 Online:2012-07-11 Published:2012-07-13

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Abstract: The soft interlayer under seafloor has great influence on the stability of subsea casing string for deepwater production. Especially, the earthquakes can cause a great bending moment and large shear force on the cross-section of casing string. An analytical model for the seismic response of subsea casing string is established on the basis of pile foundation theories and method of reverberation-ray matrix. The casing string is assumed to be a Timoshenko beam of variable cross-section. The bending moments and shear forces of different casing sections are discussed from the aspects of the shear wave velocity and thickness of soft interlayer. The result shows that while shear wave velocity of soft interlayer decreases or its thickness tends to the critical value hcr, the bending moment and shear force of casing string at interfaces of soft interlayer will increase accordingly. Therefore, influence of soft interlayer on seismic response of casing string should be fully taken into account in marine engineering.

Key words: deepwater production, casing string, soft interlayer, method of reverberation-ray matrix, seismic response

CLC Number: 

  • TU 435
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