›› 2012, Vol. 33 ›› Issue (9): 2822-2828.

• Numerical Analysis • Previous Articles     Next Articles

Investigations on uplift failure of pipe buried in cemented seabed using distinct element method

YAN Chao1, 2, JIANG Ming-jing2, 3, ZHANG Wang-cheng2, 3, SUN De-an1   

  1. 1. Department of Civil Engineering, Shanghai University, Shanghai 200072, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3. Key Laboratory of Geotechnical & Underground Engineering, Ministry of Education, Tongji University, Shanghai 200092, China
  • Received:2012-05-14 Online:2012-09-11 Published:2012-09-12

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Abstract: This paper presents a numerical study of the resistance and failure of cemented seabed burying an uplifting pipe using distinct element method (DEM). The mechanical properties of cemented sand are firstly simulated and analyzed with various inter-grain bond strength; and then, local deformation, distribution of broken bond, and displacement fields are investigated to analyze the failure mechanism of cemented seabed with different bond strength during pipe uplifting; Finally, uplift resistances and upheaval displacement of cemented seabed are discussed with respect to bond strength effect. The results show that the ground deformation and inter-grain bond failure are mainly located in overlying soils of the pipe. Furthermore, The backfilling of soils beneath the pipe vanishes as the increase of bond strength, an apparent tensile-failure rupture above the pipe, and an enhanced uplift resistance of cemented seabed are observed. In addition, the upheaval displacement of seabed increases with the pipe uplift displacement.

Key words: pipeline, cemented sand, uplift resistance, upheaval damage, distinct element method

CLC Number: 

  • TU 443
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