CASK_SPUDPEN Computer Program for Jack -up Leg Penetration during Preload based on ISO 19905 – 1 (2016)
CASK_SPUDPEN task is to calculate independent Jack-up rig leg penetration behaviour during preloading according to ISO Standard 19905-1 (2016) including foundation calculation methods, e.g. squeezing for sand and clay calculations – software originally created by Steve Kay Note: the Spudcan software is CLI (command line interface based) – so text based only.
The main task objectives are to:
– Predict the final leg penetration depth
– Identify potential punch-through situations.
Spudcan needs a single text input file (ASCII format).This input file contains all data to do the run at run-time there are no screen commands / menu. Once the data are read in by the program no changes to the data at run-time are permitted.
(aka mudline or seabed)
Also river bed (inshore)
Normally Consolidated Clay
Cohesive soil with an undrained shear strength su in the range 0.2 to 0.35 times the in-situ vertical effective
stress (0.2 < su / σ’vo < 0.35)
Undrained shear strength
Maximul soil shear stress at yielding or at a specified maximum strain in an undrained condition
Submerged weight of all of the soil that can be preent on top of the spudcan
Soil that flows from beneath the spudcan around the sides onto the top
Soil above the plan are of the spupcan arising from sediment transport or hole sidewall collapse (note: that infill is part of backfill)
Sea floor depression which remains when a jack-up is removed from a site.
Soil and spudcan supporting jack-upleg
A spudcan is the footing on a leg of a Jack-up Rig. It is designed to spread the load so that the rig does not sink too deeply into the seafloor. In plan, spudcans are generally circular, polygonal or square, with a variable cross-section. The largest spudcan used to date is about 17.5 m diameter, 5 m high and a volume of around 500 m3.
A spud-pole is the footing on a leg of (smaller) Jack-up Rigs or barges/pontoons. These are heavy poles or pipes which penetrate the seafloor and hold it in place. Unlike spudcans, these are commonly installed using kinetic energy.
Spudcan with a peripheral skirt
Squeezing (aka extrusion)
In this context of spudcan penetration, squeezing denotes radial soil extrusion.
Rapid, uncontrolled vertical leg moment due to soil of failure in strong soil overlying weak soil.
Installations of the spudcans by vertical loading of the soil beneath a jack-up leg spudcan with the objective of ensuring sufficient foundation capacity under assessment situations through to the time when the maxium load is applied and held.
Maximum vertical reaction under a spudcan, VL, supporting the in-water weight of the jack-up during the entire preloading operation.
Gross Bearing Capacity
Ultimate Limit State (pure V load) – at foundation depth D (or fictitious foundation depth DPT) excluding soil
surcharge (if any) between D and DPT
Net Bearing Capacity
as Gross Bearing Capacity but including soil surcharge between D and DPT
Note: each license term can be adjusted to your needs with a minimum of 1 year and 1 user.
Intermediate foundations are used as anchors for floating platforms and ancillary structures, foundations for steel jackets, and to support seafloor equipment and offshore wind turbines. When installed by suction, they are an economical alternative to piling, and also may be completely removed.
They are usually circular in plan and are essentially rigid when laterally loaded. Length to diameter embedment ratios, L/D, generally vary between 0.5 and 10, spanning the gap between shallow and deep foundations, although these are indicative boundaries and the response, rather than the embedment ratio, defines an intermediate foundation.
The first chapters introduce foundation types; compare shallow, intermediate and deep foundation models and design; define unique design issues that make intermediate foundations distinct from shallow and deep foundations, as well as list their hazards that mainly occur during installation. Later chapters cover installation, in-place resistance and in-place response, and miscellaneous design considerations.
There is no general agreement as to which design methods/models are appropriate, so models should only be as accurate as the data. Therefore, several reasonably accurate models are provided together with comprehensive discussion and advice. Example calculations and over 200 references are also included.
• SBM Offshore • SPT Offshore • Multiconsult • Bluewater • RINA • HDEC •
and many more.