...Assaf Klar; Andrea Franza; Mingliang Zhou; Hong-Wei Huang This paper presents a new formulation of the problem of tunnelling effects on pipelines, which incorporates the tunnel kinematic constraints in the tunnel–soil–pipeline interaction analysis. This ‘constrained continuum formulation’ can...

...A. KLAR; A. M. MARSHALL Tunnel excavation causes ground movements which have the potential to cause damage to other buried infrastructure, including pipelines. This note examines the tunnel–pipeline interaction problem from the context of an elastic-continuum based approach. A theoretical proof...

...S. CHATTERJEE; S. GOURVENEC; D.J. WHITE The changing soil strength due to consolidation around a subsea pipeline can alter the lateral breakout resistance. Results of elasto-plastic coupled consolidation finite-element analyses are presented that quantify the effect of consolidation...

...M. KUO; M. BOLTON Natural cores from the crust that is found over deep-ocean sediments off the west coast of Africa have been tested in direct shear following one-dimensional consolidation under normal stresses relevant to pipelines. Shearing tests were conducted at different speeds of 0·5, 0·05, 0...

...F. SAHDI; C. GAUDIN; D.J. WHITE; N. BOYLAN; M.F. RANDOLPH Submarine slides are a significant hazard to the safe operation of pipelines in the proximity of continental slopes. This paper describes the results of a centrifuge testing programme aimed at studying the impact forces exerted...

...E.S. WILLIAMS; B.W. BYRNE; A. BLAKEBOROUGH A key parameter for assessing the unburial behaviour of offshore pipelines, such as during upheaval buckling, is the soil uplift resistance. Despite much research on uplift response, two variables remain relatively unexplored: the effect of low relative...

...B.W. BYRNE; J. SCHUPP; C.M. MARTIN; A. MACONOCHIE; J. OLIPHANT; D. CATHIE Offshore pipelines are often buried to protect them from damage, and to provide additional thermal insulation. In sandy soils the pipes are trenched using jet-trenching or ploughing. In both cases the nature of the trenching...

...M. KUO; M. BOLTON Deep ocean sediments off the west coast of Africa exhibit a peculiar undrained strength profile in the form of a crust, albeit of exceptionally high water content, overlying normally consolidated clay. Hot-oil pipelines are installed into these crustal sediments, so their origins...

...M.F. RANDOLPH; D.J. WHITE; Y. YAN Axial pipe–soil resistance is an important aspect of deep-water pipeline design, since it influences the longitudinal and lateral buckling responses under thermally induced expansion and contraction of the pipeline. Experimental evidence has shown that the axial...

... of both on-bottom (partially embedded) and trenched (fully embedded) offshore pipelines. The soil is modelled as a rigid-plastic Tresca material with either uniform strength or strength proportional to depth. The effects of soil weight, interface roughness and interface tensile capacity are investigated...

...D.J. WHITE; H.R.C. DINGLE The large-amplitude lateral soil resistance between an on-bottom pipeline and the seabed is an important design parameter in assessing pipeline behaviour during lateral thermal buckling or under the impact of a submarine slide. This paper describes a series of centrifuge...

... on pipelines are considered, drawing on centrifuge tests and analytical solutions, and a new design approach is presented, taking into account the reduction of soil stiffness with increasing shear strain as a result of tunnel volume loss. The lecture concludes with a description of a distributed strain sensing...

...M. F. Randolph; D. J. White 23 05 2007 17 12 2007 © 2008 Thomas Telford Ltd 2008 clays failure offshore engineering pipelines plasticity theoretical analysis The penetration resistance and the force required to cause lateral movement of pipelines at shallow...