Stabilization of old crushed stone backfill prior to new trenching
Stabilization of old crushed stone backfill prior to new trenching
(OP)
We are looking to excavate several deep (10-25') trenches in an area with a high concentration of underground utilities. The existing utilities have been backfilled with 3/4" crushed stone (very porous) which will create significant problems by bleeding into the new trenches as they are dug. As we have limited space for laying the slopes back and we do not want to undermine nearby existing utilities, we are looking for a way to stabilize the crushed stone prior to trenching. Bedrock is about 10' deep. Sheet piling is a possibility but would like to avoid if another option is available. Ground water is expected to be minimal. Dirt, if found, will be a good red clay.
Are there any pressure grouting methods that utilize a low strength grout mix that would stabilize the crushed stone from bleeding but would be diggable with a large excavator?
Are there any pressure grouting methods that utilize a low strength grout mix that would stabilize the crushed stone from bleeding but would be diggable with a large excavator?





RE: Stabilization of old crushed stone backfill prior to new trenching
RE: Stabilization of old crushed stone backfill prior to new trenching
RE: Stabilization of old crushed stone backfill prior to new trenching
RE: Stabilization of old crushed stone backfill prior to new trenching
Small mole boring machine for sewers, using mud.
Follow with a hauled in or shoved in utility?
Could a bentonite slurry filled trench be used and then lay in your utility from above and follow with the same gravel backfill as others used?
Can your utility be changed as to details of material type and use, such as force main, etc.?