huangyhg

vertical concrete box design
if a square concrete well is to be constructed on clayed soil enviroment, what forces should be considered taking into consideration that it will be located near an existing water canal?
my thinking is that being an structure where each wall is basically supported on three sides (side walls and bottom or top slab), the forces that should be considered are the at rest pressure. please comment on any additional load to be considered.
if you are designing an concrete culvert, you should get a copy of aashto code, you will find all the info you need. actually there is a easy way to do it. dot of your state or other state may have a free program for culvert design. it maybe free. the program manual will list all the items you need to check of course loads you use and how to model.... it helps?
use rcp box culverts for the well. the boxes can be sealed with chemical grout. how deep are you going?
richard a. cornelius, p.e.
i would consider the following load cases for an insitu constructed reinforced concrete chamber. however, can you use precast concrete rings as an alternative. pc are not 100% water tight but that might not be an issue for a well.
1) external pressure on walls from soil (at rest is conservative);
2) external water pressure;
3) additional surcharge at ground level such as from traffic (construction or otherwise) or snow;
4) flotation check to ensure structure is buoyant in a high water table, will induce additional loading in walls and base;
5) internal water pressure with no backfill if you carry out a watertightness test;
6) any construction loads depending on construction sequence;
if it is near to a canal you might also need to consider special durability requirements depending on whether the canal water is contaminated

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