... leading up to more detailed discus- sions of plasticity analysis methods for situations that fall outside the realm of classical methods. 3.1 Practical issues for designing offshore shallow foundations 3.1.1 Strength characterisation One of the primary inputs to any capacity calcula- tion is the soil...

...-day seafloor is relatively flat and of low relief, which is primarily attributable to multiple phases of glacial, glacio- marine and marine deposition over the last 250 000 years (see Figure 6). 6. Strength and Deformation Characteristics in Comparison with Native Rock The characteristics of the rock...

... conductor performance recommendation strength knowledge management tullow oil 1. Introduction 1.1 Background Tullow Oil and its development partners are devel- oping the Jubilee field, which spans the Deepwater Tano and West Cape Three Points blocks in deep- water offshore Ghana (Figure 1). During...

... cpt stinger operator audibert exxonmobil development company laboratory testing upstream oil & gas free-fall cpt data penetration programme site investigation rate effect logarithmic method cpt data exxonmobil development company strength material constant correction method...

... decreased with the presence of gas. Second, the shear strength of the clay could decrease or increase with the presence of gas, similar to what was discovered in Nava (2010), while in sand a decrease could occur. 1. Introduction One of the most complex phenomena that occur in the marine sediments...

... to carry out laboratory tests at room temperature (i.e. 20°C). Previous studies have indicated that testing at room temperature can result in laboratory measured strengths 10–20% lower than tests at in situ temperatures. Results from extensive parallel laboratory testing (at room temperature...

...1. Introduction 1.1 Background Very soft offshore sediments within the Gulf of Guinea present sizeable challenges for the design of pipelines and suction caissons that are to be installed into these sediments. Undrained shear strength pro- files of these sediments typically exhibit high values...

... bearing pressure undrained shear strength strength strength gain drilling fluid selection and formulation water content strength regain drilling fluid formulation drilling fluid chemistry dosage concentration slurry clay slurry capacity factor moisture content calcium hydroxide...

... ABSTRACT Remoulded shear strength is an important design parameter for several offshore geotechnical engineering applications, including design of skirted anchor and foundation systems, and for submarine slope stability analysis. However, there are significant differences in the equipment...

... the traditional alpha ap- proach (where shear resistance is calculated by mul- tiplying an undrained shear strength by an adhesion factor is convenient, the major difficulties are: (i) deciding the value of alpha and undrained shear strength to use (and accurately assess- ing the near-surface strength, and any...

... carbonate soil roughness new framework strength pipe-soil interaction upstream oil & gas effective stress failure envelope axial resistance shear box test undrained strength offshore pipeline resistance excess pore pressure consolidation axial pipe-soil interaction interface...

.... The annual probability of slope failure was assessed across the WND development area within ArcGIS, incorporating mapped variable geological controls (e.g. soil strength, slope angle) as inputs. Failure probabilities were spatially generated using the concept of slope facets, defined as areas of seabed...

..., or footprint ) at the site. The depth and con- figuration of a footprint are a function of several fac- tors. These include: (a) the soil type, strength and stratification; (b) the spudcan final penetration depth before extraction; (c) the degree of soil backfill dur- ing installation (unless the backfilled...

... production system resistance norwegian geotechnical institute geotechnical design skarv fpso penetration upstream oil & gas prediction misorientation anchor location anchor geometry anchor suction anchor loading shear strength fpso offshore norway te langford subsea system strength...

.... The dependence of the penetration behaviour on the friction angle and dilation behaviour of sand, the undrained shear strength of the underlying clay and the normalised sand layer thickness are also discussed. 635 stresses and material properties, are continuously mapped from the previous mesh to the new. Yu et...

..., it is multiples of the safety factor of the casing with weak cement. The safety factor for the casing with weak cement, in the presence of hydrates in the formation, reduces due to hydrate dissociation and the subsequent deterioration of the mechanical strength of the formation. This paper shows that in this case...

...; lo- cal friction, fs; and excess pore water pressure, u. These parameters provide an identification of the soil types. They also give access to the undrained shear strength of clays, su, and the relative density of sands, by means of empirical PIPE-SOIL INTERACTION IN HIGHLY PLASTIC CLAYS Hedi...

...) pipeline resistance factor soil resistance roughness strength soft clay backfill friction angle interface relative roughness resistance interaction soil response upstream oil & gas pipeline embedment offshore pipeline embedment undrained condition displacement consolidation lateral...

.... Bearing capacity factors for the T-bar and ball, N T-bar and N Ball relating to undrained shear strength, s u , and remoulded shear strength, s u-rem , are compared with theoretically derived N factors. Overall, the close relationship between net resistances from the T-bar and ball, q T-bar and q ball...

... ABSTRACT Geotechnical design of various foundation solutions and evaluation of geohazards requires a range of soil parameters, including monotonic and cyclic shear strengths as well as deformation and consolidation characteristics. For deepwater soft clays the determination of these parameters...