a) Burial depth of the pipeline; b) Basic soil properties (unit weight, cohesion, internal friction angle and in situ density). c) Properties of backfill soil in the trench; d) Depth of water table; and
a) Burial depth of the pipeline;b) Basic soil properties (unit weight, cohesion, internal friction angle and in situ density).c) Properties of backfill soil in the trench;d) Depth of water table; and