Trench Backfill With Lime Modified Soils
Trench Backfill With Lime Modified Soils
(OP)
Our local ordinance specifies a 12 inch soil cap for trench backfill over storm/sanitary sewers due to the requirement of lime modified soils. Our state sewer specifications do not address lime modified soils, but specify select granular backfill (sand), mechanically compacted in 6 in. lifts for final backfill, to the top of the subgrade. The contractor has been allowed to "jet" under paved areas. We are having real problems with "dips" in the road. Any suggestions on backfill/compaction options or the use of flowable fill? Keep in mind this is silty clay soil in Illinois with a relatively high water table.





RE: Trench Backfill With Lime Modified Soils
RE: Trench Backfill With Lime Modified Soils
1) Isn't that water jet horizontal boring?
2) Would pressure grouting work in such situations?