Guidelines for pipeline on-bottom stability on liquefied noncohesive seabeds

Based on previously available results and the recent research within the Liquefaction around Marine Structures program this paper formulates practical guidelines for design of pipeline on-bottom stability on noncohesive seabeds. Existing methods for calculating the probability of seabed liquefaction are recommended and the requirements for site investigations are discussed. A new formula is presented for the embedment of pipelines in liquefied soils. The implications of the method presented here are somehow similar to the density guidelines used for pipeline stability in the 1960s and 1970s but this work provides a clearer scientific justification for the methods.

[1]  Andrew Palmer,et al.  Pipeline stability on a mobile and liquefied seabed: a discussion of magnitudes and engineering implications , 2001 .

[2]  Raymond B. Seed,et al.  Recent Advances in Soil Liquefaction Engineering and Seismic Site Response Evaluation , 2001 .

[3]  H. Bolton Seed,et al.  Sand Liquefaction Under Cyclic Loading Simple Shear Conditions , 1968 .

[4]  Jørgen Fredsøe,et al.  Liquefaction around Pipelines under Waves , 2006 .

[5]  W. Magda,et al.  Floatation of Buried Pipeline Under Cyclic Loading of Water Pressure , 1999 .

[6]  Peter K. Robertson,et al.  Cone-penetration testing in geotechnical practice , 1997 .

[7]  Hervé Michallet,et al.  Fluid-Soil-Structure Interaction in Liquefaction around a Cyclically Moving Cylinder , 2006 .

[8]  W. G. McDougal,et al.  Wave-Induced Pore Water Pressure Accumulation in Marine Soils , 1989 .

[9]  Mehmet A. Sherif,et al.  PORE-PRESSURE PREDICTION DURING EARTHQUAKE LOADINGS , 1978 .

[10]  Jørgen Fredsøe,et al.  Sinking/floatation of pipelines and other objects in liquefied soil under waves , 1999 .

[11]  Peter Stansby,et al.  On A Horizontal Cylinder Resting On A Sand Bed Under Waves And Currents , 1992 .

[12]  B. Sumer,et al.  The mechanics of scour in the marine environment , 2002 .

[13]  H. Bolton Seed,et al.  Wave‐induced pore pressure in relation to ocean floor stability of cohesionless soils , 1978 .

[14]  P. D. Wit,et al.  Liquefaction of cohesive sediments caused by waves , 1995 .

[15]  H. Bolton Seed,et al.  Closure of "Sand Liquefaction in Large-Scale Simple Shear Tests" , 1976 .

[16]  A. Chan,et al.  Numerical modeling of wave-induced liquefaction around pipelines , 2006 .

[17]  D. Jeng,et al.  Wave-induced soil response in an unsaturated anisotropic seabed of finite thickness , 1994 .

[18]  Jørgen Fredsøe,et al.  Critical Flotation Density of Pipelines in Soils Liquefied by Waves and Density of Liquefied Soils , 2006 .

[19]  A. Palmer,et al.  Stability of submarine pipelines on liquefied seabeds , 2006 .

[20]  M. Biot.  General Theory of Three‐Dimensional Consolidation , 1941 .

[21]  Andrew Palmer,et al.  A flaw in the conventional approach to stability design of pipelines , 1996 .

[22]  Tetsuo Sakai,et al.  FIELD OBSERVATION OF WAVE-INDUCED POREWATER PRESSURES , 1993 .

[23]  Andrew Palmer,et al.  Experimental study of marine pipelines on unstable and liquefied seabed , 2003 .

[24]  Malcolm D. Bolton,et al.  Physics of Liquefaction Phenomena around Marine Structures , 2006 .

[25]  Osman I. Ghazzaly,et al.  Stability of Offshore Pipe in Cohesive Sediment , 1975 .