Greetings from California,
I would be interested to see "plans". For example, I'd like to better understand the configuration of these deep trenches (those at 9m especially).
What is going in these trenches? Can these utilities withstand any settlement/expansion?
I'd especially be interested to learn the scale of the project...
I'd also like to understand the available work-room, terrain to see how this problem could be attacked--and how we could judicially waste this black cotton say using a scraper-haul, in a manner that won't create a mess for others.
Do you have "good" Geotechnical info which allowed you to determine the depths of the black cotton?
Next--what kind of equipment do you have available? As we get into those 2.6 meter depths, I envision we're likely going to need some decent heavy equipment if we building a lot of road.
How will the roadway surfaces be paved? What is the terrain? What does do the drainage systems look like?
All-in-all I'd suggest we look at the project as a whole--the black cotton is one nasty component; hopefully the worst.
------------------------------
Scott Onishuk P.E., M.ASCE
Director
Santa Barbara CA
------------------------------
Original Message:
Sent: 10-29-2017 13:57
From: Kalyan Emandi
Subject: Utility Layout - Road and infrastructure Project
Hello all!
I currently involved in a Roads and infrastructure Project.
The Proposed layout has 16 trenches with 12 utilities at various depths ranging from 1.5 to 9 meters.
The terrain is black cotton soil which needs to be disposed off. The depths range from 1.2 to 2.6 meters.
Question: what should be the method of execution?
1) Should I remove the black cotton soil, complete the utilities, backfill and move upwards to formation and finish levels?
Or
2) Should I remove the black cotton soil, backfill using recommended material, excavate for the utilities, and proceed to formation and finish levels on utilities completion?
Would appreciate inputs from fellow engineers...
------------------------------
Kalyan Emandi
Sr.Project Engineer
------------------------------