Granular bedding serves which primary purpose in pipe installations?

Granular bedding serves which primary purpose in pipe installations?

• A. Increase soil density
• B. Provide a cushion for workers
• C. Improve color of soil
• D. Support the pipe and promote drainage

Answer: (D)

The main idea here is that granular bedding under a pipe creates a stable, even foundation that distributes the pipe’s load and allows water to drain away. The granular material fills gaps and prevents point loads from soil, helping the pipe stay level and resist settlement. Its porosity lets water escape rather than pool beneath the pipe, reducing issues like buoyancy, poor support, or frost-related movement. This clearly distinguishes it from just backfill compaction (which increases surrounding soil density) or safety cushions for workers or cosmetic soil changes.

The main idea here is that granular bedding under a pipe creates a stable, even foundation that distributes the pipe’s load and allows water to drain away. The granular material fills gaps and prevents point loads from soil, helping the pipe stay level and resist settlement. Its porosity lets water escape rather than pool beneath the pipe, reducing issues like buoyancy, poor support, or frost-related movement. This clearly distinguishes it from just backfill compaction (which increases surrounding soil density) or safety cushions for workers or cosmetic soil changes.