Loader Operator Certification Exam Prep · Question
When performing backfilling operations for a trench containing a newly laid water pipe, what is the primary reason for using granular material for the initial lift directly above the pipe?
Using granular material directly above the pipe provides drainability, protecting the pipe from potential damage due to hydrostatic pressure, frost heave, or di
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Question: When performing backfilling operations for a trench containing a newly laid water pipe, what is the primary reason for using granular material for the initial lift directly above the pipe?
Answer options:
- To reduce the overall weight on the pipe. ✅ To provide drainability and prevent damage from frost heave or consolidation.
- To allow for easier re-excavation in the future.
- To increase the compaction rate of the backfill.
Correct answer: To provide drainability and prevent damage from frost heave or consolidation.
Explanation: Using granular material directly above the pipe provides drainability, protecting the pipe from potential damage due to hydrostatic pressure, frost heave, or differential settlement caused by soil consolidation. It also cushions the pipe against larger backfill material.
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