Pipelines are going to be placed in a trench of 4 m wide. The invert of pipes would be 5 m below the surface ground elevation. Ground is sandy silt (SPT=11), clayey silt (SPT=17), clayey sand (SPT=4) and below 7 m depth silty sand (SPT=15). Groundwater table is high.
We are using pre-fab cage with steel plates.
Could someone please advise 1-2 references/design manual to design the above trench - including heave, embedment length. Thank you very much.
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