Drilling and installing Piezometer and Inclinometer on Reclaimed Site 2

[saiya]

Does anyone have experience in drilling for the installation of an inclinometer and piezometer in a reclaimed site?
I am curious about how do you put in the porous sand and bentonite separately, especially when the soil is collapsing.
(see photo below)

Thank you!!

 

[GeoEnvGuy]

Inclinometer installations are drilled into a competent foundations. In my typical installations casing is run to bedrock then the rock is cored for 5 to 10 feet. Followed by taking out the drill rods but leaving the casing seated on bedrock the inclinometer pipe is installed and grouted with weak cement grout mix. As the casing is removed the grout mix is topped off.

Piezometer installations in loose deposits I typically use mud rotary to prevent heave into the casing. Following drilling the hole is flushed with clean water and then the piezometer is installed to the depth within the casing. Sand and bentonite are back filled concurrent with casing removal to prevent collapse.

 

[GeoPaveTraffic]

It would be helpful if we knew why you were wanting to install the instruments.

Current practice for installing vibrating wire piezometers is to just grout them in place. So drill with mud, lower the piezometers to depth, and grout.

Could do the inclinometer the same way, but is more difficult because it wants to float out on you.

Mike Lambert

 

[GeoEnvGuy]

To address GeoPaveTraffic's point of floating inclinometers, clean water is used to help with the install, the level of water needs to be below the frost line if left in place, which is fine if you are using a manual inclinometer reader. You may want to consider draining the pipe later if in place inclinometer readers are used.