Diaphragm Wall with 4m Embedment into Medium/Hard Rock
Diaphragm Wall with 4m Embedment into Medium/Hard Rock
(OP)
Hi, guys. I'm looking for an information on the on-going (still under construction) project with a diaphragm wall embedded into medium/hard rock more than 4m.
It does not matter where the project site is globally.
The design of my project requires the diaphragm wall to be inserted into med/hard rock more than 4m with a rock pin or H-pile down below.
The profile is; Top 15m is the sandy silt with gravel and below 15m is med/hard rock of 55~100MPa UCS values.
Total excavation depth is 30m, which gives average 19m D-wall and 11m toe pin below.
However, the local sub contractors do not have a proper equipment or experience for this 'deep' rock embedment scheme.
This is due to the fact that normal local geology here has 'sound' weathered rock above the base rock and usually less than 1m embedment into the base rock is enough for the D-wall stability.
This situation requires me to find a project of the same or similar condition.
If possible, I'm considering to visit the site and the contractors to see the actual construction with my subcontractors.
Thanks.
Paul
It does not matter where the project site is globally.
The design of my project requires the diaphragm wall to be inserted into med/hard rock more than 4m with a rock pin or H-pile down below.
The profile is; Top 15m is the sandy silt with gravel and below 15m is med/hard rock of 55~100MPa UCS values.
Total excavation depth is 30m, which gives average 19m D-wall and 11m toe pin below.
However, the local sub contractors do not have a proper equipment or experience for this 'deep' rock embedment scheme.
This is due to the fact that normal local geology here has 'sound' weathered rock above the base rock and usually less than 1m embedment into the base rock is enough for the D-wall stability.
This situation requires me to find a project of the same or similar condition.
If possible, I'm considering to visit the site and the contractors to see the actual construction with my subcontractors.
Thanks.
Paul





RE: Diaphragm Wall with 4m Embedment into Medium/Hard Rock
RE: Diaphragm Wall with 4m Embedment into Medium/Hard Rock
RE: Diaphragm Wall with 4m Embedment into Medium/Hard Rock
RE: Diaphragm Wall with 4m Embedment into Medium/Hard Rock
Alternatively, you could think of predrilling and use mechanical cable grab and chisel if you can't dspose of a hydromill rig but it will take more time.
RE: Diaphragm Wall with 4m Embedment into Medium/Hard Rock
I have medium to hard rock at the base and need to mobilize the special rig for it.
Previous trial of using pre-drilling and chisel did not come out with the satisfactory results.
That was why I was looking for the similar cases as I can't find any in the country.
As recommended, now I'm discussing with one of the mentioned suppliers.
Thanks, guys.
RE: Diaphragm Wall with 4m Embedment into Medium/Hard Rock
RE: Diaphragm Wall with 4m Embedment into Medium/Hard Rock
But I would like to see toe pin design. We do not do that here. So you cut diaphragm wall before maximum depth of excavation? Do you have a simple sketch?