This chapter examines the complex loading mechanisms acting on structural members partially or fully buried in bulk material stockpiles, storage sheds, and bins. Emphasis is placed on support columns and conveyor trestle legs that experience combined lateral and vertical loads during filling, storage, and reclaim operations. The analysis distinguishes between active and passive stress states within the bulk solid, demonstrating how changes in stress fields, flow patterns, material properties, and loading history influence pressure distributions and resulting forces on buried members. Analytical models are developed to quantify lateral pressures, frictional drag, and cumulative compressive loads due to shear stresses acting along the member surfaces, with particular attention given to the contribution of these loads to column bending and buckling. The chapter also addresses the uncertain and often limited support provided by backfilling on rear faces. Design equations, parametric discussions, case studies, and experimental observations are presented to support a conservative and rational approach to structural design for buried support elements in bulk solids handling facilities.