Abstract
Backfill is needed after putting pipes in the trench and the stress changes with the change of overburden compaction multiplier. We use CAESAR II to do stress analysis and draw the reasonable overburden compaction multiplier on a gas pipeline. By changing the soil overburden compaction multiplier and comparing pipes mean stress value, when the overburden compaction multiplier is set to 3, operation, primary and secondary stress ratio would reach minimum. And with the increase of overburden compaction multiplier, the stress ratio increases slightly.
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