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A Plate Load Test (PLT) is a widely used in-situ geotechnical investigation method to determine the bearing capacity and settlement characteristics of soil and sometimes weak or weathered rock at a specific depth. It is especially important for designing foundations such as footings, rafts, and pavements. What is Plate Load Test? A Plate Load Test is a field test in which a rigid steel plate is placed at the foundation level (test depth), and incremental loads are applied. The corresponding settlement of the soil/rock beneath the plate is measured. The results help engineers determine: Safe bearing capacity (SBC) Load–settlement behavior Modulus of subgrade reaction (k-value) Elastic deformation characteristics Purpose of Plate Load Test For Soil: Determine ultimate bearing capacity (UBC) Evaluate allowable bearing pressure Study settlement behavior under load Assist in design of shallow foundations For Rock (Weak / Weathered): Estimate deformability of rock mass Check bearing response of fractured rock Assist in foundation design for heavy structures (dams, bridges, etc.)
