hey everyone this is my first participation in here so hope u all be helpful
I'm owrking on a project where the soil is weathered rock.. so no problem with bearing capacity or settlement.. but the problem is the existence of cavities.. one of the boreholes already identified a 1.2m thick cavity.
we assigned a subcontractor to do cement grouting on a 5mx5m grid and to a depth of 6m (because its a raft foundation)
now the problem is: What grouting pressure to use?
the consultant suggested a 1-2 bar pressure.. whereas the contractor says its insufficient at all because it wont be enough to infill the grout in between the nodes of the grid.. the contractor also says that a 1 bar (atmospheric) pressure is only sufficient to fill the drilled holes and to infiltrate into the ground and improve the soil.
the consultant says: we don't need to grout all the site because it's expensive.. only local grouting of the boreholes is enough since the soil is rocky and strong..
we just can't find a consensus.. any suggestions?? I can't find any pressure limit for grouting in the codes ( only a rule of thumb that results in a 1.2 bar pressure), however i found a pressure limit for anchoring in the BS code that states a limit of 20bar ( not sure but close to 20bar )..
plz help!
I'm owrking on a project where the soil is weathered rock.. so no problem with bearing capacity or settlement.. but the problem is the existence of cavities.. one of the boreholes already identified a 1.2m thick cavity.
we assigned a subcontractor to do cement grouting on a 5mx5m grid and to a depth of 6m (because its a raft foundation)
now the problem is: What grouting pressure to use?
the consultant suggested a 1-2 bar pressure.. whereas the contractor says its insufficient at all because it wont be enough to infill the grout in between the nodes of the grid.. the contractor also says that a 1 bar (atmospheric) pressure is only sufficient to fill the drilled holes and to infiltrate into the ground and improve the soil.
the consultant says: we don't need to grout all the site because it's expensive.. only local grouting of the boreholes is enough since the soil is rocky and strong..
we just can't find a consensus.. any suggestions?? I can't find any pressure limit for grouting in the codes ( only a rule of thumb that results in a 1.2 bar pressure), however i found a pressure limit for anchoring in the BS code that states a limit of 20bar ( not sure but close to 20bar )..
plz help!