Shortfall in earthwork refers to the failure to achieve a required target value — typically the compaction degree (e.g., < 97% Proctor), bearing capacity (EV2 value below requirement), or subgrade accuracy (specified elevation not achieved). Shortfalls are identified during quality control (plate bearing test, leveling) and must be remedied before work continues.
Common causes: incorrect soil moisture content, insufficient roller passes, unsuitable soil material, failure to observe layer thickness requirements, or excessive compaction speed. For elevation shortfalls: calculation errors, GPS calibration problems, or soil settlement.
Remediation depends on the cause and may include: re-compaction, soil replacement, material improvement (lime, cement), or re-grading. Performance specifications define tolerances — for example, ±3 cm for subgrade preparation, DPr ≥ 97% for backfill. Systematic shortfalls indicate fundamental problems and require adjustment of the work method.